| 铝基化合物改性富锂锰三元正极材料的高温性能 | |
| High temperature performances of lithium-rich manganese ternary cathode material modified by aluminum based compounds | |
| 摘要: 通过多相复合分别制备了Al2O3、AlF3、AlPO4改性的富锂锰三元正极材料(Li1.2Ni0.133Co0.133Mn0.533O2,LR)。采用X射线光电子能谱、透射电镜和电化学交流阻抗等对复合材料的成分结构、高温下的电化学性能及作用机理进行了研究。结果表明:Al2O3改性的Li1.2Ni0.133Co0.133Mn0.533O2(LRO)性能最佳,包覆层薄且均匀;在50℃高温下,LRO的200圈平均放电比容量为189.5 mAh·g-1,容量保持率为81.5%,比原材料分别提高61.5 mAh·g-1、49.8%;100圈循环后的电荷转移电阻为443.1 Ω,仅为原材料一半,表现出较优的电化学性能。 | |
| 关键词: 富锂锰三元正极材料 氧化铝 高温性能 锂离子电池 | |
| 基金项目: 山东省自然科学基金(No.ZR2022QE244)资助。 | |
| Abstract: To solve the problem of the electrochemical performance of lithium-rich manganese ternary cathode material (Li1.2Ni0.133Co0.133Mn0.533O2, LR) with poor cyclic stability at high temperatures, the materials modified with Al2O3, AlF3, and AlPO4 were prepared by simple multi-phase recombination. X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and electrochemical impedance spectroscopy (EIS) were used to study the composition structure, electrochemical properties, and mechanism of the composite materials at high temperatures. The results showed that the Li1.2Ni0.133Co0.133Mn0.533O2 modified with Al2O3 (LRO) had the best properties and the coating layer was thin and uniform. At 50℃, the average discharge capacity of LRO was 189.5 mAh·g-1 for 200 cycles, and the capacity retention rate was 81.5%, which was 61.5 mAh·g-1 and 49.8% higher than that of raw materials, respectively. The charge transfer resistance of LRO after 100 cycles was 443.1 Ω, only half of the raw materials, showing excellent electrochemical performance. | |
| Keywords: lithium-rich manganese ternary cathode material alumina high temperature performance lithium-ion battery | |
| 投稿时间：2022-12-24 修订日期：2023-04-17 | |
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| 王桢,李俐,张俊亭,邓晓龙,刘永锋.铝基化合物改性富锂锰三元正极材料的高温性能[J].无机化学学报,2023,39(6):1053-1060. | |
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