文献类型：期刊文献

中文题名：氧化铟改性对LiNi_(0.95)Co_(0.025)Mn_(0.025)O_(2)正极材料电化学性能影响

英文题名：Effect of In_(2)O_(3)modification on electrochemical performance of LiNi_(0.95)Co_(0.025)Mn_(0.025)O_(2)cathode material

作者：侯诗艺[1,2];张同宝[2];杨座国[1]

机构：[1]华东理工大学化工学院,上海200237;[2]中石化(上海)石油化工研究院有限公司,上海201208

年份：2023

卷号：47

期号：12

起止页码：1543

中文期刊名：电源技术

外文期刊名：Chinese Journal of Power Sources

收录：CSTPCD;;北大核心:【北大核心2020】；

语种：中文

中文关键词：超高镍三元正极材料;氧化铟;改性;高温二次煅烧

外文关键词：ultra high nickel ternary cathode material;indium oxide;modification;high temperature secondary calci‐nation

摘要：超高镍三元正极材料LiNi_(0.95)Co_(0.025)Mn_(0.025)O_(2)(NCM)放电比容量高,环境友好,但容量衰减快和倍率性能差两大问题制约着它的应用。通过高温二次煅烧方法,研究In_(2)O_(3)对材料的改性作用,提升材料电化学性能。结果表明,In_(2)O_(3)可以通过体相和界面双重协同效应提升材料的电化学性能。在界面可以降低材料表面残碱含量,抑制电极与电解液之间的副反应,同时降低材料表面Ni^(2+)含量,降低材料锂镍混排度,提高材料有序性。在体相上,降低循环过程中H_(2)-H_(3)不可逆相转变,减少容量损失。当In_(2)O_(3)质量分数为0.5%时,材料的电化学性能表现最优,其中材料在1 C条件下循环百次后容量保持率从65.1%提升至81.5%,10 C条件下放电比容量从106.3 mAh/g提升至146.9 mAh/g。该研究结果对超高镍正极材料的改性具有重要意义。
The ultra-high nickel ternary cathode material LiNi_(0.95)Co_(0.025)Mn_(0.025)O_(2)(NCM)has a high discharge specific capacity and is environmentally friendly,but its application is limited by two major issues:fast capacity decay and poor rate performance.The modification of In_(2)O_(3)of materials was studied to improve the electrochemical perfor‐mance of the material.The results show that In_(2)O_(3)can improve the stability of materials in both bulk and interface.At the interface,the residual alkali content on the surface can be reduced,the side reaction between the electrode and the electrolyte can be suppressed,and moreover,the content of Ni^(2+)on the surface of materials is reduced for lower degree of Li/Ni mixing.In bulk phase,the irreversible phase transition of H2-H3 during circulation is reduced.The optimized addition of In_(2)O_(3)is 0.5%with the best electrochemical performance.The capacity retention rate of the material increases from 65.1%to 81.5%after 100 cycles at 1 C,and the discharge specific capacity increases from 106.3 mAh/g to 146.9 mAh/g at 10 C.