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Synthesis and electrochemical behavior of K+ and Mn2+ co-doped LiFePO4/C as a cathode material for lithium-ion batteries and the mechanism of modification. J Electroanal Chem (Lausanne) 2023. [DOI: 10.1016/j.jelechem.2023.117275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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Fu X, Hurlock MJ, Ding C, Li X, Zhang Q, Zhong WH. MOF-Enabled Ion-Regulating Gel Electrolyte for Long-Cycling Lithium Metal Batteries Under High Voltage. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2106225. [PMID: 34910853 DOI: 10.1002/smll.202106225] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 11/15/2021] [Indexed: 06/14/2023]
Abstract
High-voltage lithium metal batteries (LMBs) are a promising high-energy-density energy storage system. However, their practical implementations are impeded by short lifespan due to uncontrolled lithium dendrite growth, narrow electrochemical stability window, and safety concerns of liquid electrolytes. Here, a porous composite aerogel is reported as the gel electrolyte (GE) matrix, made of metal-organic framework (MOF)@bacterial cellulose (BC), to enable long-life LMBs under high voltage. The effectiveness of suppressing dendrite growth is achieved by regulating ion deposition and facilitating ion conduction. Specifically, two hierarchical mesoporous Zr-based MOFs with different organic linkers, that is, UiO-66 and NH2 -UiO-66, are embedded into BC aerogel skeletons. The results indicate that NH2 -UiO-66 with anionphilic linkers is more effective in increasing the Li+ transference number; the intermolecular interactions between BC and NH2 -UiO-66 markedly increase the electrochemical stability. The resulting GE shows high ionic conductivity (≈1 mS cm-1 ), high Li+ transference number (0.82), wide electrochemical stability window (4.9 V), and excellent thermal stability. Incorporating this GE in a symmetrical Li cell successfully prolongs the cycle life to 1200 h. Paired with the Ni-rich LiNiCoAlO2 (Ni: Co: Al = 8.15:1.5:0.35, NCA) cathode, the NH2 -UiO-66@BC GE significantly improves the capacity, rate performance, and cycle stability, manifesting its feasibility to operate under high voltage.
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Affiliation(s)
- Xuewei Fu
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
| | - Matthew J Hurlock
- Department of Chemistry, Washington State University, Pullman, WA, 99164, USA
| | - Chenfeng Ding
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
| | - Xiaoyu Li
- Materials Science and Engineering Program, Washington State University, Pullman, WA, 99164, USA
| | - Qiang Zhang
- Department of Chemistry, Washington State University, Pullman, WA, 99164, USA
- Materials Science and Engineering Program, Washington State University, Pullman, WA, 99164, USA
| | - Wei-Hong Zhong
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
- Materials Science and Engineering Program, Washington State University, Pullman, WA, 99164, USA
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Yi D, Cui X, Li N, Zhang L, Yang D. Enhancement of Electrochemical Performance of LiFePO 4@C by Ga Coating. ACS OMEGA 2020; 5:9752-9758. [PMID: 32391462 PMCID: PMC7203687 DOI: 10.1021/acsomega.9b04165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 04/14/2020] [Indexed: 05/12/2023]
Abstract
LiFePO4 (LFP) is one of the cathode materials widely used in lithium ion batteries at present, but its electronic conductivity is still unsatisfactory, which will affect its electrochemical performance. Ga-coated LiFePO4@C (LFP@C) samples were prepared by a hydrothermal method and ultrasonic dispersion technology. Ga has good electrical conductivity and can rapidly conduct electrons within the LFP cathode material under the synergistic effect with C coating, thus improving the dynamic performance of the LFP cathode material. The experimental results show that LFP@C/Ga samples exhibit good electrochemical performance. Compared with the pristine LFP@C, the 1.0 wt % Ga-coated LFP@C cathode exhibits excellent discharge capacity and cycle stability. The former shows a discharge capacity of 152.6 mA h g-1 at 1 C after 100 cycles and a discharge capacity retention rate of 98.77%, while pristine LFP@C shows only a discharge capacity of 114.5 mA h g-1 and a capacity retention rate of 95.84% after 100 cycles at 1 C current density.
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Affiliation(s)
- Dawei Yi
- School of Material
Science and Engineering, Xihua University, Chengdu 610039, China
| | - Xumei Cui
- School of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China
- School of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, China
| | - Nali Li
- School of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, China
| | - Liu Zhang
- School of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, China
| | - Dingyu Yang
- School of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China
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Yang H, Liu J, Wang X, Zhao C, Wang L, Wang Y, Xia Y, Liu T. Positive Surface Pseudocapacitive Behavior-Induced Fast and Large Li-ion Storage in Mesoporous LiMnPO 4 @C Nanofibers. CHEMSUSCHEM 2019; 12:3817-3826. [PMID: 31237111 DOI: 10.1002/cssc.201901377] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/24/2019] [Indexed: 06/09/2023]
Abstract
Olivine-structured LiMnPO4 (LMP) is an efficient Li+ host owing to its high theoretical energy density and thermal stability. However, its poor ionic and electronic conductivity severely hinder its practical application. Herein, one-dimensional (1D) LMP@C nanofibers with in situ created 3D mesoporous architecture are reported and the charge-storage behavior is addressed. Ultrafine LMP nanoparticles are homogeneously confined in the nanofibers with interconnected and exposed mesoporous intersections, facilitating the electronic/ionic transportation and retarding the pulverization/fracture of electrodes. Remarkably, the hierarchical construction promotes a certain degree of pseudocapacitive contribution. The diffusion-controlled battery-type and surface-controlled capacitive faradaic redox processes act synergistically, giving new insights into Li-ion storage cathode materials to reach the common goal of high energy density and power density simultaneously. The current separation technique suggests surface-dominated pseudocapacitance as the major Li+ storage mechanism at high rates, which is regarded as an efficient way to improve the rate performance. Hence, the as-prepared LMP@C nanofibers could deliver a high reversible capacity of 149.8 mAh g-1 with 92 % charge retention over 300 cycles at 0.2 C (1 C=171 mA g-1 ). Even at a high rate of 5 C, a capacity of 63.1 mAh g-1 is retained after 2000 cycles with an exceptional cyclic stability.
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Affiliation(s)
- Hao Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, PR China
| | - Jingyuan Liu
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, and, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200433, PR China
| | - Xiaofei Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, PR China
| | - Chengcheng Zhao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, PR China
| | - Lina Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, PR China
| | - Yonggang Wang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, and, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200433, PR China
| | - Yongyao Xia
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, and, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200433, PR China
| | - Tianxi Liu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, PR China
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Juarez-Yescas C, Ramos-Sánchez G, González I. Influence of reduced graphene oxides (rGO) at different reduction stages as conductive additive in Li-ion batteries. J Solid State Electrochem 2018. [DOI: 10.1007/s10008-018-4021-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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