导线
电化学
锂(药物)
表面改性
离子键合
阴极
材料科学
电压
涂层
离子
化学工程
分析化学(期刊)
纳米技术
电极
化学
复合材料
电气工程
物理化学
内分泌学
工程类
有机化学
医学
色谱法
作者
Bin Shen,Xing Xu,Wanmin Liu,Mulan Qin,Weigang Wang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-11-03
卷期号:4 (11): 12917-12926
被引量:6
标识
DOI:10.1021/acsaem.1c02575
摘要
As the cathode material of commercial lithium-ion batteries (LIBs) with the highest volumetric energy density, LiCoO2 is still widely used in the field of consumer electronics products. Although LiCoO2 can theoretically deliver 273 mA h g–1, the practical specific capacity is about 185 mA h g–1 (corresponding to the charging voltage of 4.5 V) due to the structural instability of LiCoO2 in the deeply delithiated state. Here, surface modification with the lithium ionic conductor LiAlSiO4 is proposed to improve the electrochemical performance of LiCoO2 at the high cutoff voltage of 4.55 V. The LiAlSiO4-coated LiCoO2 (LAS-LCO) delivers a reversible specific capacity of 209.3 mA h g–1, and the capacity loss is only 10.7% after 100 cycles at the cutoff voltage of 4.55 V. Moreover, LAS-LCO also exhibits an excellent rate capability (specific capacity of 160.0 mA h g–1 at 8C). This superior electrochemical performance results from the effective surface modification with LiAlSiO4, which not only stabilizes the surface structure in the deeply delithiated state as a physical protective layer, but also improves the stability of the bulk structure by forming a solid-solution phase LiAlxCo1–xO2. The functional coating of the lithium ionic conductor LiAlSiO4 is an effective strategy to improve the electrochemical performance of high-voltage (4.55 V) LiCoO2.
科研通智能强力驱动
Strongly Powered by AbleSci AI