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Li H, Zhu Y, Ye Q, Hu W, Zhou Q. First-principle study on the geometric and electronic structure of Mg-doped LiNiO 2 for Li-ion batteries. J Mol Model 2023; 29:389. [PMID: 38030739 DOI: 10.1007/s00894-023-05797-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 11/23/2023] [Indexed: 12/01/2023]
Abstract
CONTEXT Ni-rich layered oxides have been widely studied as cathodes because of their high energy density. However, the gradual structural transformation during the cycle will lead to the capacity degradation and potential decay of the cathode materials. In this paper, first-principle calculations were used to investigate the formation energy, and geometric and electronic structure of Mg-doped LiNiO2 cathode for Li-ion batteries. The results show that Mg doping has little effect on the geometric structure of LiNiO2 but has great effect on its electronic structure. Our data give an insight into the microscopic mechanism of Mg-doped LiNiO2 and provide a theoretical reference for experimental research, which is helpful to the design of safer and higher energy density Ni-rich cathodes. METHOD In this work, all calculations were performed by the VASP package; the PBE functional in the generalized gradient approximation (GGA) was employed to describe the exchange-correlation interactions. An energy cutoff of 520 eV and a 5 × 5 × 3 Monkhorst-Pack mesh of k-point sampling in the Brillouin zone were chosen for all calculations. All atoms were relaxed until the convergences of 10-5 eV/f.u in energy and 0.01 eV/Å in force were reached.
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Affiliation(s)
- Huili Li
- School of Computer Science, Jiangxi University of Chinese Medicine, Nanchang, 330004, People's Republic of China
| | - Yanchen Zhu
- School of Computer Science, Jiangxi University of Chinese Medicine, Nanchang, 330004, People's Republic of China
| | - Qing Ye
- School of Computer Science, Jiangxi University of Chinese Medicine, Nanchang, 330004, People's Republic of China.
| | - Wei Hu
- Key Laboratory of Green New Materials and Industrial Wastewater Treatment of Nanchang City, Yuzhang Normal University, Nanchang, 330103, People's Republic of China.
| | - Qinghua Zhou
- Department of Science Teaching, Jiangxi University of Technology, Nanchang, 330098, People's Republic of China
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Ji H, Qiao R, Yu H, Wang S, Liu Z, Monteiro R, Ribas R, Zhu Y, Ben L, Huang X. Electrolysis Process-Facilitated Engineering of Primary Particles of Cobalt-Free LiNiO 2 for Improved Electrochemical Performance. ACS Appl Mater Interfaces 2023; 15:39291-39303. [PMID: 37580122 DOI: 10.1021/acsami.3c06908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
The particle morphology of LiNiO2 (LNO), the final product of Co-free high-Ni layered oxide cathode materials, must be engineered to prevent the degradation of electrochemical performance caused by the H2-H3 phase transition. Introducing a small amount of dopant oxides (Nb2O5 as an example) during the electrolysis synthesis of the Ni(OH)2 precursor facilitates the engineering of the primary particles of LNO, which is quick, simple, and inexpensive. In addition to the low concentration of Nb that entered the lattice structure, a combination of advanced characterizations indicates that the obtained LNO cathode material contains a high concentration of Nb in the primary particle boundaries in the form of lithium niobium oxide. This electrolysis method facilitated LNO (EMF-LNO) engineering successfully, reducing primary particle size and increasing particle packing density. Therefore, the EMF-LNO cathode material with engineered morphology exhibited increased mechanical strength and electrical contact, blocked electrolyte penetration during cycling, and reduced the H2-H3 phase transition effects.
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Affiliation(s)
- Hongxiang Ji
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Mat Lab, Dongguan 523808, Guangdong China
| | - Ronghan Qiao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Mat Lab, Dongguan 523808, Guangdong China
| | - Hailong Yu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Mat Lab, Dongguan 523808, Guangdong China
| | - Shan Wang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150006, China
- Department of Applied Chemistry, Harbin Institute of Technology at Weihai, Weihai 264209, China
| | | | - Robson Monteiro
- Companhia Brasileira de Metalurgia e Mineração, 04538-133, São Paulo, Brazil
| | - Rogerio Ribas
- Companhia Brasileira de Metalurgia e Mineração, 04538-133, São Paulo, Brazil
| | - Yongming Zhu
- Songshan Lake Mat Lab, Dongguan 523808, Guangdong China
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150006, China
- Department of Applied Chemistry, Harbin Institute of Technology at Weihai, Weihai 264209, China
| | - Liubin Ben
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Mat Lab, Dongguan 523808, Guangdong China
| | - Xuejie Huang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Mat Lab, Dongguan 523808, Guangdong China
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Han WK, Wei JX, Xiao K, Ouyang T, Peng X, Zhao S, Liu ZQ. Activating Lattice Oxygen in Layered Lithium Oxides through Cation Vacancies for Enhanced Urea Electrolysis. Angew Chem Int Ed Engl 2022; 61:e202206050. [PMID: 35582843 DOI: 10.1002/anie.202206050] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Indexed: 12/15/2022]
Abstract
Despite the fact that high-valent nickel-based oxides exhibit promising catalytic activity for the urea oxidation reaction (UOR), the fundamental questions concerning the origin of the high performance and the structure-activity correlations remain to be elucidated. Here, we unveil the underlying enhanced mechanism of UOR by employing a series of prepared cation-vacancy controllable LiNiO2 (LNO) model catalysts. Impressively, the optimized layered LNO-2 exhibits an extremely low overpotential at 10 mA cm-2 along with excellent stability after the 160 h test. Operando characterisations combined with the theoretical analysis reveal the activated lattice oxygen in layered LiNiO2 with moderate cation vacancies triggers charge disproportion of the Ni site to form Ni4+ species, facilitating deprotonation in a lattice oxygen involved catalytic process.
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Affiliation(s)
- Wen-Kai Han
- School of Chemistry and Chemical Engineering/Guangzhou Key Laboratory for Clean Energy and Materials/Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, No. 230 Wai Huan Xi Road, 510006, P. R. China
| | - Jin-Xin Wei
- School of Chemistry and Chemical Engineering/Guangzhou Key Laboratory for Clean Energy and Materials/Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, No. 230 Wai Huan Xi Road, 510006, P. R. China
| | - Kang Xiao
- School of Chemistry and Chemical Engineering/Guangzhou Key Laboratory for Clean Energy and Materials/Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, No. 230 Wai Huan Xi Road, 510006, P. R. China
| | - Ting Ouyang
- School of Chemistry and Chemical Engineering/Guangzhou Key Laboratory for Clean Energy and Materials/Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, No. 230 Wai Huan Xi Road, 510006, P. R. China
| | - Xinwen Peng
- School of Light Industry Science and Engineering, South China University of Technology, Guangzhou, Wushan Street, 510641, P. R. China
| | - Shenlong Zhao
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Zhao-Qing Liu
- School of Chemistry and Chemical Engineering/Guangzhou Key Laboratory for Clean Energy and Materials/Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, No. 230 Wai Huan Xi Road, 510006, P. R. China
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Ji H, Ben L, Yu H, Qiao R, Zhao W, Huang X. Electrolyzed Ni(OH) 2 Precursor Sintered with LiOH/LiNiO 3 Mixed Salt for Structurally and Electrochemically Stable Cobalt-Free LiNiO 2 Cathode Materials. ACS Appl Mater Interfaces 2021; 13:50965-50974. [PMID: 34664953 DOI: 10.1021/acsami.1c14568] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Cobalt-free LiNiO2 cathode materials offer a higher energy density at a lower cost than high Co-containing cathode materials. However, Ni(OH)2 precursors for LiNiO2 cathodes are traditionally prepared by the coprecipitation method, which is expensive, complex, and time-consuming. Herein, we report a fast, facile, and inexpensive electrolysis process to prepare a Ni(OH)2 precursor, which was mixed with LiOH/LiNO3 salts to obtain a LiNiO2 cathode material. A combination of advanced characterization techniques revealed that the LiNiO2 cathode material prepared in this way exhibited an excellent layered structure with negligible Li/Ni site mixing and surface structural distortion. Electrochemical cycling of the LiNiO2 cathode material showed an initial discharge capacity of 235.2 mA h/g and a capacity retention of 80.2% after 100 cycles (at 1 C) between 2.75 and 4.3 V. The degradation of the cycling performance of the LiNiO2 cathode material was mainly attributed to the formation of a surface solid-electrolyte interface and a ∼5 nm rock salt-like structure, while the bulk structure of the cathode after cycling was generally stable.
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Affiliation(s)
- Hongxiang Ji
- Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, People's Republic of China
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Liubin Ben
- Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, People's Republic of China
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hailong Yu
- Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, People's Republic of China
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ronghan Qiao
- Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, People's Republic of China
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenwu Zhao
- Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, People's Republic of China
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xuejie Huang
- Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, People's Republic of China
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Bae C, Dupre N, Kang B. Further Improving Coulombic Efficiency and Discharge Capacity in LiNiO 2 Material by Activating Sluggish ∼3.5 V Discharge Reaction. ACS Appl Mater Interfaces 2021; 13:23760-23770. [PMID: 33979118 DOI: 10.1021/acsami.1c04359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The electrochemical activity of LiNiO2 at the initial cycle and factors affecting its activity were understood. Even though LiNiO2 can achieve almost theoretical charge capacity, it cannot deliver the theoretical discharge capacity that would result in low 1st Coulombic efficiency (CE). For different upper cut-off voltages at 4.3 and 4.1 V, the 1st CE barely increases. Given that the H2-H3 phase transition occurs at ∼4.2 V, the low 1st CE is not caused by this phase transition but is a result of the additional 3.5 V discharge reaction, which is kinetically limited and thereby not activated even at a reasonable current density. We found out that the several phase transitions during charge/discharge in LiNiO2 barely affect the 3.5 V reaction. Under galvanostatic intermittent titration technique (GITT) conditions, LiNiO2 can achieve ∼250 mAh/g of discharge capacity and 100% CE even with the 4.3 V cut-off voltage by fully activating the 3.5 V reaction. Using neutron diffraction and 6Li nuclear magnetic resonance (NMR) measurements, the sluggish kinetics of the 3.5 V reaction can be ascribed to difficult insertion of Li at the end of the discharge because this reaction can be accompanied by the rearrangement of cations or local structure change in the structure. To achieve high discharge capacity in LiNiO2 with the 4.3 V cut-off voltage, this 3.5 V sluggish reaction should be improved. The finding and understanding underlying the mechanism of the electrochemical activity will stimulate further research on high-capacity Ni-rich layered materials for high-performance Li-ion batteries.
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Affiliation(s)
- Changgeun Bae
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Nicolas Dupre
- Institut des Materiaux Jean Rouxel (IMN), Université de Nantes, CNRS UMR 6502, 2 rue de la Houssiniere, BP 32229, Nantes Cedex 3 44322, France
| | - Byoungwoo Kang
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
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Wang C, Zhang R, Kisslinger K, Xin HL. Atomic-Scale Observation of O1 Faulted Phase-Induced Deactivation of LiNiO 2 at High Voltage. Nano Lett 2021; 21:3657-3663. [PMID: 33821650 DOI: 10.1021/acs.nanolett.1c00862] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
LiNiO2 and cobalt-free ultrahigh-Ni content cathodes suffer from rapid capacity loss and severe chemomechanical degradation, especially when operated at high voltages. Here, by cycling LiNiO2 up to 4.7 V, we report the atomic-scale observation of O1 faulted phase-induced deactivation of LiNiO2. We find that, although a thin layer of the O3 phase forms on the particle surface by reversible O3 → O1 transformation during discharge, the bulk interior still maintains the O1 faulted phase, leading to rapid capacity loss of LiNiO2. Moreover, the atomic configuration of the O1/O3 interface is investigated comprehensively. We reveal that the misfit along the c axes of the O1 and O3 phases results in the formation of misfit dislocations, whereby cation mixing is promoted at the dislocation cores. A transition zone with continuous shear along the a-b plane is uncovered between the O1 and O3 phases for the first time. Besides, severe oxygen loss-induced pore formation and concurrent rock salt transformation are also identified.
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Affiliation(s)
- Chunyang Wang
- Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697, United States
| | - Rui Zhang
- Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697, United States
| | - Kim Kisslinger
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Huolin L Xin
- Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697, United States
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Cho E, Seo SW, Min K. Theoretical Prediction of Surface Stability and Morphology of LiNiO 2 Cathode for Li Ion Batteries. ACS Appl Mater Interfaces 2017; 9:33257-33266. [PMID: 28895392 DOI: 10.1021/acsami.7b08563] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ni-rich layered oxides are considered to be a promising cathode material with high capacity, and their surface structure should be extensively explored to understand the complex associated phenomena. We investigated the surface stability and morphology of LiNiO2 as a representative of these materials by using density functional theory calculations. The results reveal that the Li-exposed surfaces have lower energies than the oxygen surfaces, irrespective of the facets, and the Ni-exposed ones are the least stable. The equilibrium morphology can vary from truncated trigonal bipyramid to truncated egg shape, according to the chemical potential, whose range is confined by the phase diagram. Moreover, the electrochemical window of stable facets is found to strongly depend on the surface elements rather than the facet directions. Contrary to the stable Li surfaces, oxygen exposure on the surface considerably lowers the Fermi level to the level of electrolyte, thereby accelerating oxidative decomposition of the electrolyte on the cathode surface.
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Affiliation(s)
- Eunseog Cho
- Platform Technology Lab, Samsung Advanced Institute of Technology , 130 Samsung-ro, Suwon, Gyeonggi-do 16678, Republic of Korea
| | - Seung-Woo Seo
- Platform Technology Lab, Samsung Advanced Institute of Technology , 130 Samsung-ro, Suwon, Gyeonggi-do 16678, Republic of Korea
| | - Kyoungmin Min
- Platform Technology Lab, Samsung Advanced Institute of Technology , 130 Samsung-ro, Suwon, Gyeonggi-do 16678, Republic of Korea
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