| 钾、氯离子共掺杂纳米Li2FeSiO4/C正极材料的电化学性能 |
| Performance of nano Li2FeSiO4/C cathode material co-doped by potassium and chlorine ions |
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| 摘要: 利用K+、Cl-共掺杂来优化纳米Li2FeSiO4/C正极材料的结构及电化学性能，通过固相反应制备了纳米Li2-xKxFeSiO4-0.5xClx/C (x=0、0.01、0.02)正极材料。采用X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱和恒电流充放电等对比研究了3种正极材料的微观结构特征和电化学性能。研究表明纳米Li1.99K0.01FeSiO3.995Cl0.01/C正极材料的晶面间距和晶胞体积最大，颗粒粒径最小，平均粒径为32 nm。这些特定的微观结构使其表现出最优的电化学性能。纳米Li1.99K0.01FeSiO3.995Cl0.01/C在0.1C下的首次放电比容量高达203 mAh·g-1，在1C下充放电循环100次的容量保持率为97.72%。 |
| 关键词: 锂离子电池 正极材料 硅酸亚铁锂 共掺杂 |
| 基金项目: 国家自然科学基金(No.21968016，21466020)资助。 |
| Abstract: Herein, the structure and electrochemical properties of nano Li2FeSiO4/C cathode materials were optimized through co-doping potassium and chlorine ions. A series of nano Li2-xKxFeSiO4-0.5xClx/C (x=0, 0.01, 0.02) composites were prepared by a solid-state reaction. The microstructure and electrochemical performance of the three kinds of composites were analyzed using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, constant current charge-discharge test, etc. The results showed that nano Li1.99K0.01FeSiO3.995Cl0.01/C cathode material owned the largest interplanar spacing, biggest cell volume, and smallest average particle size among the three materials. The average particle size of nano Li1.99K0.01FeSiO3.995Cl0.01/C cathode material was as small as 32 nm. These particular structures made it exhibit the best electrochemical performance. The initial specific discharge capacity of the nano Li1.99K0.01FeSiO3.995Cl0.01/C cathode material at 0.1C was as high as 203 mAh·g-1. In addition, a capacity retention rate of 97.72% was acquired for the nano Li1.99K0.01FeSiO3.995Cl0.01/C cathode material at 1C after 100 charge-discharge cycles. |
| Keywords: lithium-ion battery cathode material lithium ferrosilicate co-doping |
| 投稿时间：2024-04-30 修订日期：2024-07-25 |
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| 张庆堂,吴小雨,王征,王晓梅.钾、氯离子共掺杂纳米Li2FeSiO4/C正极材料的电化学性能[J].无机化学学报,2024,40(9):1689-1696. |
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