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钇离子掺杂对锂离子电池富镍正极材料的电化学影响

发表时间:2020-03-31  浏览量:345  下载量:26
全部作者: 刘丹,朱伟,朱小健,王礼,彭俊仁
作者单位: 重庆大学化学化工学院
摘 要: 本文讨论Y3+掺杂对锂离子电池正极材料LiNi0.85Co0.075Mn0.075O2的影响。首先采用共沉淀法合成LiNi0.85Co0.075Mn0.075(OH)2前驱体,然后在一定的氧气气氛下,采用固态氧化法制备目标产物LiNi0.85Co0.075Mn0.075O2、Li(Ni0.85Co0.075Mn0.075)0.98Y0.02O2正极材料。采用X射线衍射(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、恒流充放电、循环伏安法对材料的微观结构、颗粒形貌和电化学性能进行分析。结果表明,Y3+的掺杂扩大了锂离子的扩散通道,抑制了样品与电解质之间的副反应,提高了样品的循环性能。在0.2C时,经过100次循环,掺杂样品的放电比容量为173 mAh·g-1,容量保持率为96.64%,电化学性能良好。
关 键 词: 物理化学;锂离子电池;共沉淀法;富镍正极材料;钇离子掺杂
Title: Electrochemical effects of yttrium ion doping on nickel-rich cathode materials for lithium-ion batteries
Author: LIU Dan, ZHU Wei, ZHU Xiaojian, WANG Li, PENG Junren
Organization: School of Chemistry and Chemical Engineering, Chongqing University
Abstract: In this paper, the influence of Y3+ doping in cathode material LiNi0.85Co0.075Mn0.075O2 of lithium-ion batteries was discussed. Firstly, the precursor LiNi0.85Co0.075Mn0.075(OH)2 was synthesized by the co-precipitation method. And then the target products cathode materials LiNi0.85Co0.075Mn0.075O2 and Li(Ni0.85Co0.075Mn0.075)0.98Y0.02O2 were synthesized by solid-state oxidation reaction in an oxygen atmosphere. X-ray diffraction (XRD), scanning electron microscope (SEM), constant current charge and discharge, cyclic voltammetry were used to analyze the microstructure, particle morphology and electrochemical properties of the materials. The results showed that Y3+ doping improved their cycling performance because it promoted the diffusion channel of Li+ and inhibited the side reactions between samples and electrolytes. At 0.2C, after 100 cycles, the discharge specific capacity of the doped sample was 173 mAh·g-1, the capacity retention rate was 96.64%, and the electrochemical performance was good.
Key words: physical chemistry; lithium-ion batteries; co-precipitation method; nickel-rich cathode material; yttrium ion doping
发表期数: 2020年3月第1期
引用格式: 刘丹,朱伟,朱小健,等. 钇离子掺杂对锂离子电池富镍正极材料的电化学影响[J]. 中国科技论文在线精品论文,2020,13(1):75-81.
 
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