F-doping effects on microstructure and electrochemical performance of cathode material Li1.2Mn0.54Ni0.13Co0.13O2

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外文摘要：Lithium-rich manganese-based(Li-rich Mn-based)cathode materials possess high specific capacity,low self-discharge rate and steady working voltage,but cycle performance and rate performance need to be further improved.In this study,cathode materials Li1.2Mn0.54Ni0.13Co0.13O2-xFx(x=0,0.02,0.05,0.08)are synthesized by the co-precipitation method with the two-step calcination process.And the F-doping effects on the microstructure and the electrochemical performance are investigated in the cathode materials Li1.2Mn0.54Ni0.13Co0.13O2.The results indicate that among all the F-doped cathode materials,the crystal lattice parameters are increased,order degree and stability of the layered structure are improved.As for x=0.05,cathode material Li1.2Mn0.54Ni0.13Co0.13O1.95F0.05(LMO-F0.05)shows the best cycle per-formance and rate performance with its capacity retention rate 87.7％after 100 cycles at 0.2 C and discharge capacity 117 mAh g-1 at 5 C high power.It can be seen that F doping is a simple and crucial strategy to promote the Li ion diffusion and develop high performance layered cathode materials.

外文关键词：

F-dopedLi-rich Mn-Based cathode materialMicrostructureCycling performanceRate performance

作者：

Xiaoqian Sun、Yunhui Du、Weiyi Zhang、Mengjiao Jin、Ruiang Fan、Peng Zhang

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作者单位：

School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing,10004,China

School of Department of Mechanical Engineering,Stanford University,Stanford,CA,94305,United States

出版年：

2024

DOI：

10.1016/j.partic.2024.09.009