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.
作者
陈艳秋
梁林巧
刘海洋
郭俊明
白玮
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)
出处
《化工新型材料》
CAS
CSCD
北大核心
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)。
