球磨法高性能Na_(3)MnTi(PO_(4))_(3)@rGO-KB钠离子电池正极材料制备  

High-performance Na_(3)MnTi(PO_(4))_(3)@rGO-KB sodium-ion battery cathode materials prepared by ball milling method

作　　者：张瀚文 耿孝东 姜月 张建新 朱楠 ZHANG Hanwen;GENG Xiaodong;JIANG Yue;ZHANG Jianxin;ZHU Nan(School of Chemistry,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化学学院,辽宁大连116024

出　　处：《大连理工大学学报》2024年第3期243-250,共8页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(22074010);中央高校基本科研业务费专项资金资助项目(DUT22YG242);营口市企业博士双创计划基金资助项目.

摘　　要：钠超离子导体(NASICON)结构的聚阴离子材料由于具有稳定的晶体结构而引起了极大的关注.然而,NASICON型材料导电性差、能量密度低和库仑效率低等固有缺陷限制了其发展.为此采用高能球磨法对Na_(3)MnTi(PO_(4))_(3)(NMTP)晶粒表面进行科琴黑(KB)和还原氧化石墨烯(rGO)的碳包覆,极大地提高了材料的导电性和离子传输效率,使其在常温和低温下的比容量和循环性能均有明显提升.在常温下NMTP@rGO-KB的质量比容量高达166.6 mAh/g,具有5000圈的循环稳定性和优异的倍率性能.在-30℃的低温下质量比容量为111.4 mAh/g,循环1000圈后质量比容量保持率为85.3%,平均库仑效率高达99.9%,为低温钠离子电池开发提供了广阔的应用前景.Polyanion materials with sodium superionic conductor(NASICON)structure have attracted great attentions due to their stable crystal structure.However,NASICON-type materials have inherent defects such as poor conductivity,low energy density and low Coulombic efficiency,which limits their developments.So the surface of Na_(3)MnTi(PO_(4))_(3)(NMTP)grain is coated with carbon of Ketjen Black(KB)and reduced graphene oxide(rGO)by high energy ball milling method,which greatly improves the conductivity and ion transport efficiency of the materials,and significantly promotes the specific capacity and cycle performance at room temperature and low temperature.The mass specific capacity of NMTP@rGO-KB at room temperature is as high as 166.6 mAh/g,with a cycle stability of 5000 cycles and excellent rate performance.At a low temperature of-30℃,its mass specific capacity is 111.4 mAh/g,the mass specific capacity retention rate is 85.3%after 1000 cycles,and the average Coulombic efficiency is as high as 99.9%,which provides a broad application prospect for the development of low temperature sodium-ion batteries.

关 键 词：钠离子电池 高能球磨法 聚阴离子正极材料 低温电池 

分 类 号：TQ152[化学工程—电化学工业]