Raising the capacity of lithium vanadium phosphate via anion and cation co-substitution  

作　　者：Xian-Xiang Zeng Hui Chen Gang Guo Sheng-Yi Li Jin-Ying Liu Qiang Ma Guote Liu Ya-Xia Yin Xiong-Wei Wu Yu-Guo Guo 

机构地区：[1]College of Science,Hunan Agricultural University,Changsha 410128,China [2]Laboratory of Molecular Nanostructure and Nanotechnology,Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences(CAS),Beijing 100190,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]College of Electrical Engineering and Automation,Foshan University,Foshan 528225,China

出　　处：《Science China Chemistry》2020年第2期203-207,共5页中国科学（化学英文版）

基　　金：supported by the Basic Science Center Project of Natural Science Foundation of China(51788104);the National Natural Science Foundation of China(51803054,51772093);the “Transformational Technologies for Clean Energy and Demonstration”,Strategic Priority Research Program of the Chinese Academy of Sciences(XDA21070300);the Natural Science Foundation of Hunan Province(2019JJ50223);“Double First-Class” School Construction Project;Outstanding Youth Fund of Hunan province(SYL201802008,2019JJ20010)

摘　　要：The pursuit for batteries with high specific energy provokes the research of high-voltage/capacity cathode materials with superior stability and safety as the alternative for lithium iron phosphate.Herein,using the sol-gel method,a lithium vanadium phosphate with higher average discharge voltage(3.8 V,vs.Li+/Li) was obtained from a single source for Mg2+ and Cl-co-substitution and uniform carbon coating,and a nearly theoretical capacity(130.1 mA h g^-1) and outstanding rate performance(25 C) are acquired together with splendid capacity retention(80%) after 650 cycles.This work reveals that the well-sized anion and cation substitution and uniform carbon coating are of both importance to accelerate kinetic performance in the context of nearly undisturbed crystal structure for other analogue materials.It is anticipated that the electrochemistry comprehension will shed light on preparing cathode materials with high energy density in the future.The pursuit for batteries with high specific energy provokes the research of high-voltage/capacity cathode materials with superior stability and safety as the alternative for lithium iron phosphate.Herein,using the sol-gel method,a lithium vanadium phosphate with higher average discharge voltage（3.8 V,vs.Li+/Li） was obtained from a single source for Mg2+ and Cl-co-substitution and uniform carbon coating,and a nearly theoretical capacity(130.1 mA h g-1) and outstanding rate performance（25 C） are acquired together with splendid capacity retention（80%） after 650 cycles.This work reveals that the well-sized anion and cation substitution and uniform carbon coating are of both importance to accelerate kinetic performance in the context of nearly undisturbed crystal structure for other analogue materials.It is anticipated that the electrochemistry comprehension will shed light on preparing cathode materials with high energy density in the future.

关 键 词：polyanion cathode ion substitution carbon coating high rate theoretical capacity 

分 类 号：TQ135.11[化学工程—无机化工] TM91[电气工程—电力电子与电力传动]