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Enhancing the Rate Performance of a Li 3 VO 4 Anode through Cu Doping
Author(s) -
Wang Kan,
Fu Haoyu,
Li Zhuoyu,
Xia Mengyang,
Liang Xiaoqiang,
Qi Ruijie,
Cao Guozhong,
Lu Xianmao
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201701172
Subject(s) - anode , materials science , electrochemistry , doping , dopant , conductivity , lithium (medication) , ion , analytical chemistry (journal) , ionic conductivity , nanotechnology , diffusion , chemical engineering , electrode , chemistry , optoelectronics , electrolyte , organic chemistry , thermodynamics , physics , medicine , engineering , endocrinology
Li 3 VO 4 (LVO), as an emerging anode material for lithium‐ion batteries (LIBs), offers distinct advantages because of its high theoretical specific capacity (590 mAh g −1 ), high ionic conductivity, and small volume change during lithiation/delithiation. However, the low electronic conductivity of LVO severely limits its viable application in LIBs. In this work, we doped LVO with Cu 2+ ions through a simple solution reaction method, aiming to improve its electronic conductivity and electrochemical performances as a LIB anode. Among various dopant concentrations, LVO doped with 10 % Cu (LVO‐0.10Cu) showed the highest Li‐ion diffusion coefficient (2.79×10 −14 cm 2 s −1 ) and specific surface area (16.1 m 2 g −1 ), as well as lowest charge‐transfer resistance. High reversible capacities of 440, 420, 379, and 335 mAh g −1 were achieved at current densities of 1, 2, 4, and 8 A g −1 , respectively. In particular, the capacity of LVO‐0.10Cu at 8 A g −1 was twice as high as that of pristine LVO (335 vs. 168 mAh g −1 ). The significantly enhanced electrochemical performance of Cu‐doped LVO can be attributed to lattice expansion and improved electronic conductivity afforded by Cu‐doping.