锰酸锂电池正极材料高温包覆改性研究  

Study on Modification of Anode Material of Lithium Manganate Battery Coated at High Temperature

作　　者：姚年春[1] 何玉林[1,2] YAO Nian-chun;HE Yu-lin(School of Mechanical Electronics and Information Engineering,Jiangsu Polytechnic of Finance and Economics, Huaian 223003,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

机构地区：[1]江苏财经职业技术学院机械电子与信息工程学院,江苏淮安223003 [2]上海大学材料科学与工程学院,上海200072

出　　处：《化学试剂》2019年第2期120-124,共5页Chemical Reagents

基　　金：江苏省高等职业院校专业带头人高端研修资助项目(2017GRFX009);淮安市科技局工业项目(HAGZ201613)

摘　　要：对尖晶石Li Mn2O4材料进行表面修饰能够在一定程度上减少电极材料和电解液的直接接触,抑制锰元素溶解。通过Pechini法制备了不同包覆量(1、1. 5和2 wt%)的锂镧锆氧固态电解质/锰酸锂复合材料。当包覆量为1. 5 wt%时,复合正极材料首次放电容量达到112. 5 m Ah/g,在55℃、0. 5 C循环100次后容量损失率仅为8. 6%。尖晶石晶粒表面形成了独特的网络状包覆层,减少了活性物质和有机电解液之间的直接接触却不影响锂离子扩散,显著提升了锰酸锂的高温电化学性能。Surface modification of spinel LiMn2O4 material can reduce the direct contact between electrode material and electrolyte,and inhibit the dissolution of manganese element. Lithium lanthanum zirconium oxide solid electrolyte/lithium manganate composites with different coating amounts( 1,1. 5 and 2 wt%) were prepared by Pechini method.When the coating content is 1. 5 wt%,the composite anode material exhibits an initial discharge capacity of 112. 5 m Ah/g at 0. 5 C-rate and a capacity loss of only8. 6% after 100 cycles at 55 ℃.A unique network-like coating was formed on the surface of spinel grains,which reduced the direct contact between active substances and organic electrolytes but did not affect the diffusion of lithium ions,and significantly improved the high-temperature electrochemical performance of lithium manganate.

关 键 词：锂镧锆氧 锰酸锂 包覆 

分 类 号：TQ152[化学工程—电化学工业]