Synthesis and electrochemical properties of Li2FeSiO4/C/Ag composite as a cathode material for Li-ion battery  

Li2FeSiO4/C/Ag复合正极材料的合成与性能研究（英文）

作　　者：TANG Yi-qun LIU Xi HUANG Xiao-bing DING Xiang ZHOU Shi-biao CHEN Yuan-dao 唐轶群;刘喜;黄小兵;丁祥;周诗彪;陈远道(Hunan Province Cooperative Innovation Center for the Construction & Development of Dongting Lake Ecological Economic Zone,College of Chemistry and Materials Engineering,Hunan University of Arts and Science,Changde 415000,China;Key Laboratory of Preparation and Application of Environmental Friendly Materials of Ministry of Education,Jilin Normal University,Changchun 130103,China)

机构地区：[1]Hunan Province Cooperative Innovation Center for the Construction & Development of Dongting Lake Ecological Economic Zone,College of Chemistry and Materials Engineering,Hunan University of Arts and Science,Changde 415000,China [2]Key Laboratory of Preparation and Application of Environmental Friendly Materials of Ministry of Education,Jilin Normal University,Changchun 130103,China

出　　处：《Journal of Central South University》2019年第6期1443-1448,共6页中南大学学报（英文版）

基　　金：Project(21771062)supported by the National Natural Science Foundation of China;Project(2016JJ2092)supported by the Hunan Provincial Natural Science Foundation,China;Project(2019013)supported by the Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials,Ministry of Education,Jilin Normal University,China

摘　　要：Li2FeSiO4 is deemed to be a potential candidate for large-scale applications because of its abundance,low cost and high safety,etc.Unfortunately,its low conductivity,resulting in poor rate performance,has become a main obstacle to its applications in power battery and energy storage system.In this work,C-Ag coated Li2FeSiO4 is introduced to improve the innate electronic conductivity and Li-ion diffusion ability.The results demonstrate that Li2FeSiO4/C/Ag composite exhibits better electrochemical performance.It possesses a specific discharge capacity of 152,121,108 mA.h/g at 0.2C,5C and 10C,respectively.At the same time,the Li2FeSiO4/C/Ag composite shows good cycle stability and a capacity retention ratio of 97.9%after 100 cycles at 1C.Li2FeSiO4正极材料因其资源丰富、成本低、安全性能高等优点备受研究者关注,但其电导率低,倍率性能较差,极大地限制在动力和储能领域的应用。针对上述问题,本文采用固相法合成C和Ag共包覆的Li2FeSiO4,以提高其电子电导率和离子扩散系数。结果表明:与Li2FeSiO4/C复合物相比,Li2FeSiO4/C/Ag复合物具有较好的电化学性能,在0.2C、5C和10C下的放电比容量分别为152、121和108 mA·h/g;1C下循环100次后,其放电容量保留为97.9%。

关 键 词：lithium-ion batteries cathode material LI2FESIO4 PITCH C-Ag coating 

分 类 号：TM912[电气工程—电力电子与电力传动] TB33[一般工业技术—材料科学与工程]