Multi-strategy synergistic Li-rich layered oxides with fluorine-doping and surface coating of oxygen vacancy bearing CeO2 to achieve excellent cycling stability

材料科学 化学工程 电解质 涂层 阴极 煅烧 氧气 兴奋剂 电化学 空位缺陷 纳米技术 电极 光电子学 化学 结晶学 有机化学 催化作用 物理化学 工程类
作者
Jie Mei,Yuanzhi Chen,Wanjie Xu,Wei He,Laisen Wang,Qingshui Xie,Dong‐Liang Peng
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:431: 133799-133799 被引量:60
标识
DOI:10.1016/j.cej.2021.133799
摘要

Li-rich layered oxides (LLOs) have attracted extensive attentions because of their high reversible capacity and operating voltages for advanced lithium-ion batteries. However, the practical applications of LLOs are restricted by the rapid decay of capacity and voltage. Herein, multi-strategy synergistic Li1.2Mn0.54Ni0.13Co0.13O2cathode materials with flourine-doping and surface coating of oxygen vacancy bearing CeO2 are prepared through a processing involving co-precipitation and subsequent calcination. The obtained cathode materials exhibit micron-sized olive-shaped particles that are comprised by nanoscale primary particles. Electrochemical testing results indicate that the multi-strategy synergistic LLO exhibits discharge specific capacities of 287.4 mAh g−1 at 0.2 C and 211.3 mAh g−1 at 2 C. Compared to the pristine LLO without modifications, high capacity retentions of 76.3% after 500 cycles at 2 C, and 79.1% after 600 cycles at 5 C have been observed for the modified LLO, which are almost 2.0 and 2.5 times that of the pristine LLO. Besides, a voltage drop of 0.511 V after 500 cycles at 2 C, and a voltage drop of 0.514 V after 600 cycles at 5 C are also observed, indicating inhibited voltage attenuation. This work demonstrates that multi-strategy synergy by flourine-doping and surface coating of oxygen vacancy bearing CeO2 can effectively enhance the cycling stability and restrain voltage attenuation of LLO cathode materials.
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