电化学
材料科学
锂(药物)
阴极
摩尔比
表面改性
锂离子电池
涂层
离子
化学工程
核化学
电池(电)
化学
复合材料
电极
有机化学
物理化学
功率(物理)
催化作用
内分泌学
工程类
物理
医学
量子力学
作者
Chunhua Song,Wenge Wang,Haiying Peng,Ying Wang,Changchun Zhao,Huibin Zhang,Qiwei Tang,Jinzhao Lv,Xianjun Du,Yanmeng Dou
摘要
LiNi0.80Co0.15Al0.05O2 (NCA) as a lithium ion battery cathode material has received attention for its highly specific capacity and excellent low temperature performance. However, the disadvantages of its high surface lithium compound residues and high pH value have influenced its processing performance and limited its application. This paper uses a facile method to modify NCA through LiAlO2 coating. The results showed that when the molar ratio of Al(NO3)3·9H2O and lithium compound residues at the surface of NCA cathode material was 0.25:1, the pH of the cathode material decreased from 12.70 to 11.80 and the surface lithium compound residues decreased from 3.99% to 1.48%. The NCA cell was charged and discharged for 100 cycles at 1 C in the voltage range of 3.0–4.3 V, to test the capacity retention of NCA. It was found to be as high as 94.67%, which was 5.36% higher than the control NCA cell. The discharge capacity of NCA-0.25-500 °C was 139.8 mAh/g even at 8 C rate, which was 15% higher than the raw NCA. Further research indicated that Al(NO3)3·9H2O reacted with the surface lithium compound residues of NCA and generated LiAlO2, which improved the NCA electrochemical performance.
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