电化学
化学
兴奋剂
锂(药物)
镍
硼
三元运算
阴极
无机化学
离子
微观结构
水溶液中的金属离子
化学工程
材料科学
电极
结晶学
物理化学
有机化学
医学
光电子学
计算机科学
工程类
程序设计语言
内分泌学
作者
Gaoqiang Mao,Ying Yang,Yingying Yao,Wen Jiao,Yang Yu,Wanjing Yu,Hui Tong,Hong He
标识
DOI:10.1016/j.jelechem.2023.117730
摘要
Nickel-rich ternary materials still suffer from defects of poor structure stability, fast capacity decay and poor rate performance, which inhibits their practical application in power batteries. Herein, a novel nickel-rich LiNi0.74Co0.14Mn0.12O2 cathode material co-doped with metallic and non-metallic ions was designed and prepared. The doped Mg2+ ions enter the lithium layers, reducing the Li+/Ni2+ cation mixing of the material; act as pillars, stabilizing the layered framework. While the doped B3+ ions occupy the tetrahedral sites, which expand the interlayer spacing and accelerate the diffusion of lithium ions. Furthermore, B3+ ions change the microstructure of the primary particles, alleviate the structural strain during the long cycle process and maintains the stability of the layered structure. Owing to the synergistic effect of Mg2+ and B3+ doping, the co-doped material exhibits superior electrochemical performance. A discharge capacity of 127.6 mAh·g−1 at 10 C, as well as a capacity retention of 91.33% after 100 cycles at 1C rate was achieved in the co-doped material. This metallic and non-metallic ion co-doping ternary material demonstrates its superiority compared with the single-element modified material.
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