尖晶石型LiNiyZn_(0.02)Mn_(1.98-y)O_(4)(y≤0.10)正极材料的简易制备及其电化学性能  

Simple preparation and electrochemical property of spinel LiNiyZn_(0.02)Mn_(1.98-y)O_(4)(y≤0.10)cathode material

作　　者：陈艳秋 梁林巧 刘海洋 郭俊明[1,2] 白玮[1,2] 向明武 Chen Yanqiu;Liang Linqiao;Liu Haiyang;Guo Junming;Bai Wei;Xiang Mingwu(National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials,Yunnan Minzu University,Kunming 650500;Key Laboratory of Green-chemistry Materials in University of Yunnan Province,Yunnan Minzu University,Kunming650500)

机构地区：[1]云南民族大学,生物基材料绿色制备技术国家地方联合中心,昆明650500 [2]云南民族大学,云南省高校绿色化学材料重点实验室,昆明650500

出　　处：《化工新型材料》2022年第8期176-181,187,共7页New Chemical Materials

基　　金：国家自然科学基金(51972282);云南省基础研究计划项目青年项目(202001AU070008)。

摘　　要：采用固相燃烧法快速合成Ni-Zn双掺杂的LiNi_(y)Zn_(0.02)Mn_(1.98-y)O_(4)(y≤0.10)正极材料。结果表明:所有制备材料的晶体结构与尖晶石型LiMnO一致,且无任何杂相生成;随着Ni掺杂量的增加,材料的粒径逐渐减小,结晶性增强。通过恒电流充放电测试对各种LiNi_(y)Zn_(0.02)Mn_(1.98-y)O_(4)(y≤0.10)正极材料进行电化学性能研究,其中,LiNi_(y)Zn_(0.02)Mn_(1.98-y)O_(4)(y≤0.10)具有良好的电化学性能,在1C倍率可释放114.3mAh/g的首次放电容量,1000次循环后,保持66.8mAh/g的可逆容量,在5C的较高倍率,其首次放电容量也高达109.6mA/g,同样可实现1000次的长循环。The Ni-Zn co-doped LiNi_(y)Zn_(0.02)Mn_(1.98-y)O_(4)(y≤0.10)cathode materials were rapidly synthesized by solid phase combustion method.Results shown that the crystal structure of all the as-prepared materials corresponded to the spinel LiMnO,and there was no any impurity.The particle size decreased and crystallization increased with the increase of Ni-doping content.The electrochemical performance of various LiNi_(y)Zn_(0.02)Mn_(1.98-y)O_(4)(y≤0.10)cathode materials was studied by galvanostatic charge-discharge test.Among them,the LiNiyZn_(0.02)Mn_(1.98-y)O_(4)(y≤0.10)had good electrochemical performance with the first discharge capacity of 114.3 mAh/g,and maintained the reversible capacity of 66.8 mAh/g at 1 C after 1000 cycles.At the high current rate of 5 C,the initial discharge capacity was as high as 109.6 mAh/g,and achieved long cycle of 1000 cycles.

关 键 词：锂离子电池 LiMn_(2)O_(4) Ni-Zn双掺杂 正极材料 固相燃烧法 

分 类 号：TM912[电气工程—电力电子与电力传动]