电化学
阴极
材料科学
歧化
兴奋剂
晶体结构
钴
锰
化学工程
共沉淀
分析化学(期刊)
无机化学
结晶学
电极
化学
冶金
物理化学
光电子学
催化作用
生物化学
色谱法
工程类
作者
Qiuming Liang,Anrui He,Huan He,Tianquan Liang
标识
DOI:10.1016/j.jallcom.2023.173057
摘要
The widespread application of Li-rich cathode material is restricted due to capacity attenuation and poor rate capability caused by crystal structure transformation and irreversible lattice oxygen escape during cycling. The Fe3+-doped effects on lattice structures and electrochemical properties of Li1.2Ni0.26−xMn0.54FexO2 (x = 0, 0.03, 0.05 and 0.08) cathode materials fabricated by a sol-gel method are systematically studied in this paper. Doped materials exhibit good electrochemical performance such as high discharge specific capacity and capacity retention at high current density rates. Li1.2 Ni0.21Mn0.54Fe0.05O2 can supply a specific capacity of 190.7 mAh g−1 with 73.6 % capacity retention after 100th cycle at 2 C, and rate capacities of 230.6, 208.5, 193.1, 172.1 and 105.6 mAh g−1 at 0.1, 0.5, 1, 2 and 5 C, respectively. It is attributed to the enhanced structural stability, enlarged Li layer spacing, intensive interaction between transition metals and oxygen, less manganese disproportionation and oxygen release and increased Li+ diffusion coefficient by Fe3+ doping.
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