Novel MOF shell-derived surface modification of Li-rich layered oxide cathode
©Science China Press
Prof. L. Q. Mai has led a research team at Wuhan University of Technology aiming to improve the electrochemical performance of electrode materials. They have developed a facile and general carbon coating technology. The unique NiCo nanodots decorated carbon shell was constructed on the as-prepared Li1.2Mn0.54Ni0.13Co0.13O2 nanoparticles masterly on this basis. The obtained LLO@C&NiCo cathode exhibits enhanced cycling and rate capability with a capacity retention of 95% after 100 cycles at 0.4 C, 90% after 300 cycles at 2 C and a high capacity of 159 mAh g-1 at 5 C, respectively.
The in-situ X-ray diffraction, electrochemical impedance spectroscopy and selected area electron diffraction analyses after cycling demonstrate that the LLO@C&NiCo as a cathode material for LIBs exhibiting superior electrochemical performances, which is due to its unique protective C&NiCo shell. It promotes the electron conductivity (5 times), reduces the diffusion impedance, provides a robust structure for LLO which suppresses the undesired formation of the spinel phase initiated from the particle surface during cycling, and also protects the surface structure from side reactions at the electrode/electrolyte interface.
Original publication
Zhitong Xiao, Jiashen Meng, Qi Li, Xuanpeng Wang, Meng Huang, Ziang Liu, Chunhua Han, and Liqiang Mai; "Novel MOF shell-derived surface modification of Li-rich layered oxide cathode for enhanced lithium storage"; Science Bulletin; Available online 13 December 2017
Jiashen Meng, Xiong Liu, Jiantao Li, Qi Li, Chuan Zhao, Linhan Xu, Xuanpeng Wang, Fang Liu, Wei Yang, Xiaoming Xu, Ziang Liu, Chaojiang Niu, and Liqiang Mai; "General oriented synthesis of precise carbon-confined nanostructures by low-pressure vapor superassembly and controlled pyrolysis"; Nano letters
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