Na、Zr复合改性提高LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料理化性能  

Improvement of physical and chemical properties of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) anode material by composite modification of Na and Zr

作　　者：彭弯弯 饶先发[1,2] 王春香[1,2] 夏鼎峰 郑东豪 周杰[1,2] 杨浩 李之锋[1,2] PENG Wanwan;RAO Xianfa;WANG Chunxiang;XIA Dingfeng;ZHENG Donghao;ZHOU Jie;YANG Hao;LI Zhifeng(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Key Laboratory of Power Battery and Materials,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000 [2]江西理工大学江西省动力电池及其材料重点实验室,江西赣州341000

出　　处：《有色金属科学与工程》2022年第5期60-67,139,共9页Nonferrous Metals Science and Engineering

基　　金：江西省教育厅科技项目(GJJ160602)。

摘　　要：基于LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料在高电压下的电化学性能不佳问题,通过简单的共沉淀法得到前驱体Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2),与适当的Na源、Zr源及Li源球磨后得到改性材料。通过对比Na和Zr单掺杂或共改性来探究改性材料电化学性能的变化。XRD结果表明,掺杂Na和Zr后,所有改性材料的Li间距和过渡金属层间距均扩大,电化学性能测试发现改性后的材料其循环、倍率性能等均得到明显提升。其中Na、Zr共改性的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM-Na-Zr),其循环和倍率性能得到显著改善,在2.75~4.35 V、1C倍率下循环200次后,仍然有177.4 mAh/g放电比容量和87.7%的容量保持率。Due to the poor electrochemical performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) anode materials under high voltage,modified materials were obtained after ball-milling of the precursor Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2) obtained through a simple coprecipitation method with appropriate Na sources,Zr sources and Li sources.The changes in the electrochemical properties of the modified materials were explored by comparing the single doping or co-modification of Na and Zr、The XRD results show that after doping with Na and Zr,the Li spacing and the transition metal layer spacing of all modified materials are expanded and the cycle and multiplier performance of the modified materials are significantly improved through the electrochemical performance tests.In addition,the cycle and multiplier performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM-Na-Zr)comodified by Na and Zr are significantly improved.After 200 cycles at 2.75~4.35 V and 1C rate,there are still the discharge specific capacity of 177.4 mAh/g and the capacity retention rate of 87.7%.

关 键 词：正极材料 掺杂 共改性 锂离子电池 

分 类 号：TG146.26[一般工业技术—材料科学与工程]