1
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Chen H, Ma J, Liu F, Yao M. Dual Strategies with Anion/Cation Co-Doping and Lithium Carbonate Coating to Enhance the Electrochemical Performance of Lithium-Rich Layered Oxides. Chemistry 2023; 29:e202302569. [PMID: 37792289 DOI: 10.1002/chem.202302569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 09/10/2023] [Accepted: 09/29/2023] [Indexed: 10/05/2023]
Abstract
Lithium-rich layered oxides (LLOs, Li1.2 Mn0.54 Ni0.13 Co0.13 O2 ) are widely used as cathode materials for lithium-ion batteries due to its high specific capacity, high operating voltage and low cost. However, the LLOs are faced with rapid decay of charge/discharge capacity and voltage, as well as interface side reactions, which limit its electrochemical performance. Herein, the dual strategies of sulfite/sodium ion co-doping and lithium carbonate coating were used to improve it. It founds that modified LLOs achieve 88.74 % initial coulomb efficiency, 295.3 mAh g-1 first turn discharge capacity, in addition to 216.9 mAh g-1 at 1 C, and 87.23 % capacity retention after 100 cycles. Mechanism research indicated that the excellent electrochemical performance benefits from the doping of both Na+ and SO3 2- , and it could significantly reduce the migration energy barrier of Li+ and promote Li+ migration. Meanwhile, anion and cation are co-doped greatly reduces the band gap of LLOs and increase its electrical conductivity, and its binding effect on Li+ is weakened, making it easier for Li+ to shuttle through the material. In addition, the lithium carbonate coating significantly inhibits the occurrence of interfacial side reactions of LLOs. This work provides a theoretical basis and practical guidance for the further development of LLOs with higher electrochemical performance.
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Affiliation(s)
- Huai Chen
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou 550025, China
- Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
| | - Jun Ma
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou 550025, China
- Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
| | - Fei Liu
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou 550025, China
- Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
| | - Mengqin Yao
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou 550025, China
- Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
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2
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Duan H, Meng D, Yuan S. Solution Combustion Synthesis of High-Performance Nano-LiFePO 4/C Cathode Material from Cost-Effective Mixed Fuels. MATERIALS (BASEL, SWITZERLAND) 2023; 16:7155. [PMID: 38005082 PMCID: PMC10672621 DOI: 10.3390/ma16227155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 11/08/2023] [Accepted: 11/09/2023] [Indexed: 11/26/2023]
Abstract
Solution combustion synthesis (SCS) is considered as an efficient and energy-saving method for preparing LiFePO4/C composite material with the nanostructure (Nano-LiFePO4/C). In this study, Nano-LiFePO4/C cathode material was prepared using SCS using a cost-effective combination of urea and sorbitol as mixed fuels. The effect of mixed fuels on combustion behavior and microstructure as well as on electrochemical performance was studied using XRD, BET, SEM, TEM, and electrochemical characterization methods. Multiple characterization results indicated that the maximum temperature (Tm) and particle size were influenced by the usage of urea and sorbitol. The sample derived under optimum conditions exhibits a mesoporous nanostructure with a large surface specific area and attractive electrochemical performance with a discharge capacity of 153.5 mAh/g at 0.1 C, which shows strong potential for commercial applications in the future.
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Affiliation(s)
- Haozhi Duan
- National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan 030001, China; (H.D.); (D.M.)
- CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan 030001, China
| | - Dehai Meng
- National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan 030001, China; (H.D.); (D.M.)
- CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan 030001, China
| | - Shuxia Yuan
- National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan 030001, China; (H.D.); (D.M.)
- CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan 030001, China
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3
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Pang R, Wang Z, Li J, Chen K. Polymorphs of Nb 2O 5 Compound and Their Electrical Energy Storage Applications. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6956. [PMID: 37959554 PMCID: PMC10647839 DOI: 10.3390/ma16216956] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 11/15/2023]
Abstract
Niobium pentoxide (Nb2O5), as an important dielectric and semiconductor material, has numerous crystal polymorphs, higher chemical stability than water and oxygen, and a higher melt point than most metal oxides. Nb2O5 materials have been extensively studied in electrochemistry, lithium batteries, catalysts, ionic liquid gating, and microelectronics. Nb2O5 polymorphs provide a model system for studying structure-property relationships. For example, the T-Nb2O5 polymorph has two-dimensional layers with very low steric hindrance, allowing for rapid Li-ion migration. With the ever-increasing energy crisis, the excellent electrical properties of Nb2O5 polymorphs have made them a research hotspot for potential applications in lithium-ion batteries (LIBs) and supercapacitors (SCs). The basic properties, crystal structures, synthesis methods, and applications of Nb2O5 polymorphs are reviewed in this article. Future research directions related to this material are also briefly discussed.
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Affiliation(s)
- Rui Pang
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China;
| | - Zhiqiang Wang
- State Key Laboratory of Crystal Materials, Institute of Novel Semiconductors, Shandong University, Jinan 250100, China;
| | - Jinkai Li
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China;
| | - Kunfeng Chen
- State Key Laboratory of Crystal Materials, Institute of Novel Semiconductors, Shandong University, Jinan 250100, China;
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4
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Stevenson M, Weiß S, Cha G, Schamel M, Jahn L, Friedrich D, Danzer MA, Cheong JY, Breu J. Osmotically Delaminated Silicate Nanosheet-Coated NCM for Ultra-Stable Li + Storage and Chemical Stability Toward Long-Term Air Exposure. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2302617. [PMID: 37264519 DOI: 10.1002/smll.202302617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/11/2023] [Indexed: 06/03/2023]
Abstract
To ensure the safety and performance of lithium-ion batteries (LIBs), a rational design and optimization of suitable cathode materials are crucial. Lithium nickel cobalt manganese oxides (NCM) represent one of the most popular cathode materials for commercial LIBs. However, they are limited by several critical issues, such as transition metal dissolution, formation of an unstable cathode-electrolyte interphase (CEI) layer, chemical instability upon air exposure, and mechanical instability. In this work, coating fabricated by self-assembly of osmotically delaminated sodium fluorohectorite (Hec) nanosheets onto NCM (Hec-NCM) in a simple and technically benign aqueous wet-coating process is reported first. Complete wrapping of NCM by high aspect ratio (>10 000) nanosheets is enabled through an electrostatic attraction between Hec nanosheets and NCM as well as by the superior mechanical flexibility of Hec nanosheets. The coating significantly suppresses mechanical degradation while forming a multi-functional CEI layer. Consequently, Hec-NCM delivers outstanding capacity retention for 300 cycles. Furthermore, due to the exceptional gas barrier properties of the few-layer Hec-coating, the electrochemical performance of Hec-NCM is maintained even after 6 months of exposure to the ambient atmosphere. These findings suggest a new direction of significantly improving the long-term stability and activity of cathode materials by creating an artificial CEI layer.
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Affiliation(s)
- Max Stevenson
- Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Sebastian Weiß
- Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Gihoon Cha
- Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Maximilian Schamel
- Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
- Chair of Electrical Energy Systems, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Leonard Jahn
- Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
- Chair of Electrical Energy Systems, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Daniel Friedrich
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Michael A Danzer
- Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
- Chair of Electrical Energy Systems, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Jun Young Cheong
- Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Josef Breu
- Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
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5
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Enhancing the electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathodes through amorphous coatings. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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6
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Lu B, Chen H, Guan C, Feng H. Surface topological synthesis of polymetallic oxides coatings on lithium layered oxide for improved capacity and high-rate performance. J Colloid Interface Sci 2022; 617:293-303. [DOI: 10.1016/j.jcis.2022.02.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 01/29/2022] [Accepted: 02/11/2022] [Indexed: 11/29/2022]
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7
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Li Z, Yu X, Lv Y, Qi L, Ma Y, zhang H, Song D, Shi X, Zhang L. Investigation on the structure and electrochemical performance of LiNi0.8Co0.1Mn0.1O2 modified with Sn. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.139468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Su K, Liu H, Gao Z, Fornasiero P, Wang F. Nb 2O 5-Based Photocatalysts. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2003156. [PMID: 33898172 PMCID: PMC8061393 DOI: 10.1002/advs.202003156] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 11/23/2020] [Indexed: 05/02/2023]
Abstract
Photocatalysis is one potential solution to the energy and environmental crisis and greatly relies on the development of the catalysts. Niobium pentoxide (Nb2O5), a typically nontoxic metal oxide, is eco-friendly and exhibits strong oxidation ability, and has attracted considerable attention from researchers. Furthermore, unique Lewis acid sites (LASs) and Brønsted acid sites (BASs) are observed on Nb2O5 prepared by different methods. Herein, the recent advances in the synthesis and application of Nb2O5-based photocatalysts, including the pure Nb2O5, doped Nb2O5, metal species supported on Nb2O5, and other composited Nb2O5 catalysts, are summarized. An overview is provided for the role of size and crystalline phase, unsaturated Nb sites and oxygen vacancies, LASs and BASs, dopants and surface metal species, and heterojunction structure on the Nb2O5-based catalysts in photocatalysis. Finally, the challenges are also presented, which are possibly overcome by integrating the synthetic methodology, developing novel photoelectric characterization techniques, and a profound understanding of the local structure of Nb2O5.
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Affiliation(s)
- Kaiyi Su
- State Key Laboratory of Catalysis (SKLC)Dalian National Laboratory for Clean Energy (DNL)Dalian Institute of Chemical Physics (DICP)Chinese Academy of SciencesDalian116023China
- University of Chinese Academy of SciencesBeijing100049China
| | - Huifang Liu
- State Key Laboratory of Catalysis (SKLC)Dalian National Laboratory for Clean Energy (DNL)Dalian Institute of Chemical Physics (DICP)Chinese Academy of SciencesDalian116023China
| | - Zhuyan Gao
- State Key Laboratory of Catalysis (SKLC)Dalian National Laboratory for Clean Energy (DNL)Dalian Institute of Chemical Physics (DICP)Chinese Academy of SciencesDalian116023China
- University of Chinese Academy of SciencesBeijing100049China
| | - Paolo Fornasiero
- Department of Chemical and Pharmaceutical SciencesINSTM ‐ Trieste and ICCOM ‐ CNR TriesteUniversity of TriesteVia L. Giorgieri 1Trieste34127Italy
| | - Feng Wang
- State Key Laboratory of Catalysis (SKLC)Dalian National Laboratory for Clean Energy (DNL)Dalian Institute of Chemical Physics (DICP)Chinese Academy of SciencesDalian116023China
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9
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Wang X, Bai Y, Wang X, Wu C. High‐Voltage Layered Ternary Oxide Cathode Materials: Failure Mechanisms and Modification Methods
†. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.202000344] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xiaodan Wang
- Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science & Engineering, Beijing Institute of Technology No. 5 South Zhongguancun Street Beijing 100081 China
| | - Ying Bai
- Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science & Engineering, Beijing Institute of Technology No. 5 South Zhongguancun Street Beijing 100081 China
| | - Xinran Wang
- Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science & Engineering, Beijing Institute of Technology No. 5 South Zhongguancun Street Beijing 100081 China
| | - Chuan Wu
- Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science & Engineering, Beijing Institute of Technology No. 5 South Zhongguancun Street Beijing 100081 China
- Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081 China
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10
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Zhang X, Ma F, Wei G, Lei Z, Qu J. Improvement of electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode material via Li2.09W0.9Nb0.1O4 Li-ion conductive coating layer. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04742-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Zhu L, Yang G, Liu J, Bao C, Xie L, Cao X. Ethylene Glycol‐Assisted Sol‐Gel Method for Preparing LiNi
1/3
Co
1/3
Mn
1/3
O
2
as Cathode Material for Lithium‐Ion Batteries with Excellent Electrochemical Performance. ChemistrySelect 2019. [DOI: 10.1002/slct.201903231] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Limin Zhu
- School of Chemistry and Chemical EngineeringHenan University of Technology, Zhengzhou, Henan China
- Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou CityHenan University of Technology, Zhengzhou, Henan China
| | - Guang Yang
- School of Chemistry and Chemical EngineeringHenan University of Technology, Zhengzhou, Henan China
- Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou CityHenan University of Technology, Zhengzhou, Henan China
| | - Jianping Liu
- School of Chemistry and Chemical EngineeringHenan University of Technology, Zhengzhou, Henan China
- Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou CityHenan University of Technology, Zhengzhou, Henan China
| | - Chenguang Bao
- School of Chemistry and Chemical EngineeringHenan University of Technology, Zhengzhou, Henan China
- Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou CityHenan University of Technology, Zhengzhou, Henan China
| | - Lingling Xie
- School of Environmental EngineeringHenan University of Technology, Zhengzhou, Henan China
- Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou CityHenan University of Technology, Zhengzhou, Henan China
| | - Xiaoyu Cao
- School of Chemistry and Chemical EngineeringHenan University of Technology, Zhengzhou, Henan China
- Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou CityHenan University of Technology, Zhengzhou, Henan China
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12
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Wang L, Liu G, Ding X, Zhan C, Wang X. Simultaneous Coating and Doping of a Nickel-Rich Cathode by an Oxygen Ion Conductor for Enhanced Stability and Power of Lithium-Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2019; 11:33901-33912. [PMID: 31441630 DOI: 10.1021/acsami.9b10310] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
With the rapid development of plug-in hybrid electric vehicles and electric vehicles, high-energy layered lithium nickel-rich oxides have received much attention, but there are still many challenges due to the inherent properties of materials. The poor cycling performance and initial capacity loss of the nickel-rich layered oxide are associated with the structural stability of the material and Li+/Ni2+ cation disorder. Moreover, the synergistic effect of the vacancy of Li and Ni in the delithiation process aggravates the instability of oxygen, eventually resulting in the release of oxygen. It can cause damage to the stability of the structure and even cause safety issues. In this work, we report that Ce0.8Dy0.2O1.9 solid electrolyte inhibits the release of oxygen and improves the structural stability and safety of the Ni-rich cathode material, which is rich in oxygen vacancies. Besides, Ni2+ could be oxidized to Ni3+ along with the strong oxidation of Ce4+ doping into the bulk structure, which suppresses the Li+/Ni2+ cation disorder and improves the initial Coulomb efficiency of the material. This study successfully designed a novel cathode material structure to provide a basis for the future development of layered lithium nickel-rich oxides, which can be used to improve the initial Coulomb efficiency and cycle life.
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Affiliation(s)
- Lifan Wang
- School of Metallurgical and Ecological Engineering , University of Science and Technology Beijing , No. 30 College Road , Haidian District, Beijing 100083 , China
| | - Gaoyang Liu
- School of Metallurgical and Ecological Engineering , University of Science and Technology Beijing , No. 30 College Road , Haidian District, Beijing 100083 , China
- Department of Chemical and Biological Engineering , University of British Columbia , Vancouver , BC V6T 1Z3 , Canada
| | - Xianan Ding
- School of Metallurgical and Ecological Engineering , University of Science and Technology Beijing , No. 30 College Road , Haidian District, Beijing 100083 , China
| | - Chun Zhan
- School of Metallurgical and Ecological Engineering , University of Science and Technology Beijing , No. 30 College Road , Haidian District, Beijing 100083 , China
| | - Xindong Wang
- School of Metallurgical and Ecological Engineering , University of Science and Technology Beijing , No. 30 College Road , Haidian District, Beijing 100083 , China
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13
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Yang C, Zhang X, Huang M, Huang J, Fang Z. Preparation and Rate Capability of Carbon Coated LiNi 1/3Co 1/3Mn 1/3O 2 as Cathode Material in Lithium Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2017; 9:12408-12415. [PMID: 28221016 DOI: 10.1021/acsami.6b16741] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
LiNi1/3Co1/3Mn1/3O2 (NCM) is regarded as a promising material for next-generation lithium ion batteries due to the high capacity, but its practical applications are limited by the poor electronic conductivity. Here, a one-step method is used to prepare carbon coated LiNi1/3Co1/3Mn1/3O2 (NCM/C) by applying active carbon as reaction matrix. TEM shows LiNi1/3Co1/3Mn1/3O2 particles are homogeneously coated by carbon with a thickness about 10 nm. NCM/C delivers the discharge capacity of 191.2 mAh g-1 at 0.5 C (85 mA g-1) with a columbic efficiency of 91.1%. At 40 C (6800 mA g-1), the discharge capacity of NCM/C is 54.6 mAh g-1, whereas NCM prepared through sol-gel route only delivers 13.2 mAh g-1. After 100 charge and discharge cycles at 1 C (170 mA g-1) the capacity retention is 90.3% for NCM/C, whereas it is only 72.4% for NCM. The superior charge/discharge performance of NCM/C owes much to the carbon coating layer, which is not only helpful to increase the electronic conductivity but also contributive to inhibit the side reactions between LiNi1/3Co1/3Mn1/3O2 and the liquid electrolyte.
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Affiliation(s)
- Chaofan Yang
- College of Chemistry & Chemical Engineering, Shaoxing University , Shaoxing 312000, People's Republic of China
| | - Xiaosong Zhang
- College of Chemistry & Chemical Engineering, Shaoxing University , Shaoxing 312000, People's Republic of China
| | - Mengyi Huang
- College of Chemistry & Chemical Engineering, Shaoxing University , Shaoxing 312000, People's Republic of China
| | - Junjie Huang
- College of Chemistry & Chemical Engineering, Shaoxing University , Shaoxing 312000, People's Republic of China
| | - Zebo Fang
- Mathematic Information College, Shaoxing University , Shaoxing 312000, People's Republic of China
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14
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Sub-2 nm Thick Fluoroalkylsilane Self-Assembled Monolayer-Coated High Voltage Spinel Crystals as Promising Cathode Materials for Lithium Ion Batteries. Sci Rep 2016; 6:31999. [PMID: 27553901 PMCID: PMC4995502 DOI: 10.1038/srep31999] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 08/01/2016] [Indexed: 11/30/2022] Open
Abstract
We demonstrate herein that an ultra-thin fluoroalkylsilane self-assembled monolayer coating can be used as a modifying agent at LiNi0.5Mn1.5O4−δcathode/electrolyte interfaces in 5V-class lithium-ion batteries. Bare LiNi0.5Mn1.5O4−δ cathode showed substantial capacity fading, with capacity dropping to 79% of the original capacity after 100 cycles at a rate of 1C, which was entirely due to dissolution of Mn3+ from the spinel lattice via oxidative decomposition of the organic electrolyte. Capacity retention was improved to 97% on coating ultra-thin FAS17-SAM onto the LiNi0.5Mn1.5O4 cathode surface. Such surface protection with highly ordered fluoroalkyl chains insulated the cathode from direct contact with the organic electrolyte and led to increased tolerance to HF.
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