Multifunctional MXene additive for enhancing mechanical and electrochemical performances of LiNi0.8Co0.1Mn0.1O2 cathode in lithium ion battery
JOURNAL OF MATERIALS CHEMISTRY A(2020)
摘要
LiNi0.8Co0.1Mn0.1O2 (NCM811) has attracted increasing attention owing to its extremely high discharge capacity (>200 mA h g(-1)). However, poor mechanical strength, cycling stability, and rate capability impose limitations on its large-scale practical applications. Here, we report that few-layer and rod-like MXene (Ti2C3Tx) as a multifunctional additive significantly enhances the mechanical property, cycling performance, and rate capability of the Li/NCM811 cells. Thus, NCM811 added with 2.5 wt% MXene (2.5-MXene) delivers the highest discharge capacity of 209 mA h g(-1) at 0.2C as well as the best rate performance with a high reversible capacity of 95 mA h g(-1) at 8C. Moreover, the capacity retention of 2.5-MXene can reach 77.0% after 100 cycles at a 0.5C rate, while it is only 53.6% for pristine NCM811 without MXene (0-MXene). Such superior performances result from the effective and multifunctional MXene additive, which is helpful to establish a better conductive network, store/release Li(+)via cation intercalation, offer more deformation space, form a physical protection CEI layer, and suppress the M <-> H2 phase transformation for the NCM811 electrodes. In addition, the DFT calculation indicates that the MXene additive can prohibit the irreversible Ni/Co/Mn elements' migration via the absorption process. Therefore, the few-layer/rod-like MXene can be a facile and efficient approach to enhance the mechanical and electrochemical performance of the NCM811 materials for large-scale applications in the next-generation energy density lithium-ion batteries by considering its multifunctional properties, low cost, and convenient accessibility.
更多查看译文
关键词
batteries,Electrochemical Properties
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要