Concise Strategies to Enhance the High-Rate Performance of Li_(3)VO_(4) Anodes:Cl Doping,Carbon Coating,and Spherical Architecture Design  

作　　者：Zongping Zhang Jie Xu Dongmei Zhang Huijuan Ma Tao Li Ting Xiao Cunyuan Pei Shibing Ni 

机构地区：[1]College of Materials and Chemical Engineering,Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials,China Three Gorges University,Yichang 443002,China [2]Hubei Three Gorges Laboratory,Yichang 443007,China [3]Analysis and Testing Center,China Three Gorges University,Yichang 443002,China [4]College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China

出　　处：《Transactions of Tianjin University》2023年第2期110-119,共10页天津大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52101262);Distinguished Youth Foundation of Hubei Province(2019CFA084);Educational offi ce of Hubei Province(Q20201201);the 111 project(D20015).

摘　　要：The safe operating voltage and low volume variation of Li_(3)VO_(4)(LVO)make it an ideal anode material for lithium(Li)-ion batteries.However,the insufficient understanding of the inner storage mechanism hinders the design of LVO-based electrodes.Herein,we investigate,for the first time,the Li-ion storage activity in LVO via Cl doping.Moreover,N-doped C coating was simultaneously achieved in the Cl doping process,resulting in synergistically improved reaction kinetics.As a result,the as-prepared Cl-doped Li_(3)VO_(4) coated with N-doped C(Cl-LVO@NC)electrodes deliver a discharge capacity of 884.1 mAh/g after 200 cycles at 0.2 A/g,which is the highest among all of the LVO-based electrodes.The Cl-LVO@NC electrodes also exhibit high-capacity retention of 331.1 mAh/g at 8.0 A/g and full capacity recovery after 5 periods of rate testing over 400 cycles.After 5000 cycles at 4.0 A/g,the discharge capacity can be maintained at 423.2 mAh/g,which is superior to most LVO-based electrodes.The Li-ion storage activity in LVO via Cl doping and significant improvement in the high-rate Li-ion storage reported in this work can be used as references for the design of advanced LVO-based electrodes for high-power applications.

关 键 词：Li_(3)VO_(4) Cl doping New mechanisms High-rate Li-ion storage 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]