富锂锰基氧化物表面錮氧化物修饰及其电化学性能  

Lanthanum OxideModification on the Surfaceof Lithium-RichManganese-Based Oxides and Electrochemical Performance

作　　者：朱铮瑶 陈卓新 王秀利 黄俊杰[3] Zhu Zhengyao;Chen zhuoxin;Wang Xiuli;Huang Junjie(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030000;Technical Center of Wolong Electric Group Zhejiang Dengta Power Source Co.,Ltd.,Shaoxing,Zhe Jiang 312000;College of Chemical Engineering,Shaoxing University,Shaoxing,Zhe Jiang 312000)

机构地区：[1]太原理工大学化学化工学院,山西太原030000 [2]卧龙电气集团浙江灯塔电源有限公司技术中心,浙江绍兴312000 [3]绍兴文理学院化工学院,浙江绍兴312000

出　　处：《数据中心建设+》2021年第9期31-34,共4页DATA CENTRE SETUP+

摘　　要：本文研究了镧氧化物对Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)(Lirich)的表面包覆改性及电化学性能。其中,包覆比例为5%的复合材料在0.1C倍率下,首次放电容量高达274.3mAh g^(-1),首次库伦效率为95.01%。此外,在包覆层的保护作用下,20次循环后的容量仍高达231.4mAh g^(-1。这是由于La与0具有较强的结合能力,进入Lirich材料晶格诱导形成LaMnO_(3)相,降低了晶格“氧缺失”现象,拓宽Li^(+)扩散通道,提高材料在循环过程中的结构稳定性。In this work,lanthanum oxide is applied to coat on the surface of Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)(Lirich).The Lirich/LaO composite material presents a high reversible capacity of 274.3 mAh g1 and a superior initial coulombic coefficient of 95.01%at 0.1 C rate.In addition,the capacity retention is still as high as 231.4 mAh g^(-1) after 20 cycles.This is due to the strong incorporation strength of La and O,entering the lattice of Lirich cathode to induce the formation of LaMnO_(3) phase.Therefore,the"oxygen deficiency"phenomenon is reduced,the Li diffusion channel is widened,and the structural stability of the material during cycling is improved.

关 键 词：Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2) 镧氧化物 包覆 正极材料 锂离子电池 

分 类 号：TG1[金属学及工艺—金属学]