Particle surface of LiMn2O4 cathode material for lithium ion battery was modified by a pyrolysis of silane coupling agent.The morphology,structure and comprehensive electrochemical properties of the materials were characterized systematically.The results shown that the SiO2 obtained from silane coupling agent was coated on the surface of the material.The coating did not affect the crystal structure and morphology,but the electrochemical properties of LiMn2O4 were improved significantly.The optimum comprehensive performance of the cathode can be obtained at SiO2 coating amount of 1wt%.The initial discharge specific capacity and capacity retention (after 100 charge-discharge cycles) of LiMn2O4 can be increased from 93.88mAh/g and 88.03% to 112.05mAh/g and 94.54% respectively after coating.The reason for this was that the coating layer can inhibit the side reactions between electrolyte and electrode material,which reduced SEI film impedance(Rf),stabilized the structure of the materials and resulted in the improvement the diffusion ability of Li+ during the insertion/deinsertion process.
Wang Sunfa, Feng Yanyan, Zhang Xiaopeng, Feng Lanlan, Yuan Zhenluo, Fan Guangxin, Liu Baozhong
. Surface treatment on structure and property of LiMn2O4 by silane coupling agent[J]. New Chemical Materials, 2020
, 48(12)
: 124
-128
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.12.030
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