Enhanced rate capability and cycling stability of lithium-rich cathode material Li 1.2 Ni 0.2 Mn 0.6 O 2 via H 3 PO 4 pretreating and accompanying Li 3 PO 4 coating
作者： Zhaohui Yang , Hongming Zhou , Zhiqiang Bao , Jian Li , Chengjie Yin
DOI: 10.1007/S10854-019-02315-8
关键词: Electrochemistry 、 Materials science 、 Dissolution 、 Electrode 、 Surface modification 、 Coating 、 Electrolyte 、 Spinel 、 Cathode 、 Chemical engineering
摘要: H3PO4 pretreated and Li3PO4 coated Li-rich materials Li1.2Ni0.2Mn0.6O2 have been prepared via hydrothermal followed by a facile modified method. The process partially extracts Li O from lattice, results in pre-activation of Li2MnO3 component the formation spinel phase. A stable coating is formed on surface material during subsequent heat treatment. pretreatment are skillfully combined using simple Electrochemical studies exhibit that electrochemical performance obviously improved after modification. treated with 0.04 mol L−1 shows more excellent properties than those cathode, high specific discharge capacity 262.6 mAh g−1 at 0.1 C, great retention 92.2% 1 C 100 cycles, an outstanding rate capability reaching 105.4 mAh g−1 10 C. enhanced caused phase layer, which can accelerate migration Li+ facilitate charge transfer reaction. also inhibits dissolution transition metal ions enhances stability electrode/electrolyte interface.
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