An effective approach to improve the electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode by an MOF-derived coating

作者：Li, Siwu^*; Fu, Xiaotao; Zhou, Junwen; Han, Yuzhen; Qi, Pengfei; Gao, Xing; Feng, Xiao; Wang, Bo^*

来源：Journal of Materials Chemistry A, 2016, 4(16): 5823-5827.

DOI：10.1039/c5ta10773c

• LITHIUM-ION BATTERIES
• METAL-ORGANIC FRAMEWORK
• LINI0.8CO0.2O2 CATHODE
• NICKEL-RICH
• SURFACE
• LICOO2
• CARBON
• ELECTRODES
• NANOCOMPOSITES
• DEPOSITION

Herein, we report an effective surface modification for a high energy cathode material, LiNi0.6Co0.2Mn0.2O2 (NCM-622), using an Al-based MOF (NH2-MIL-53), as a precursor to produce MOF-derived alumina (MDA) coatings. The MDA-coating (2.5 wt%) is well-dispersed on the surface of NCM-622 with an amorphous structure. By virtue of the MDA-coating, NCM-622 shows greatly enhanced electrochemical performance: 214.6 mA h g(-1) and 196.5 mA h g(-1) (3.0-4.5 V vs. Li+/Li) at 0.2C and 1C, respectively, with a capacity retention of 92.7% after 100 cycles at 1C; even at high rates of 5C and 10C, the discharge capacity still approaches 168.5 mA h g(-1) and 150.0 mA h g(-1), respectively. We found that these enhancements can be ascribed to the improved structural stability and electrochemical kinetics of NCM-622 by the MDA-coating.

• 出版日期2016
• 单位北京理工大学