首页|Preparation of high-rate anode materials based on porous highly conductive carbon coating and SiOx disproportionation reaction
Preparation of high-rate anode materials based on porous highly conductive carbon coating and SiOx disproportionation reaction
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Silicon monoxide(SiOx)has garnered considerable attention as an anode material owing to its high capacity.Nevertheless,its commercial viability is hampered by the low conductivity and inadequate cycling stability.In this study,a micrometer-scale silicon oxide/carbon composite(1000-SiOx/NC)was developed based on the porous and high electrical conductivity of pyrolyzed polydopamine(PDA)and the high-temperature dispropor-tionation of SiOx.Electrochemical impedance spectroscopy(EIS)and X-ray photoelectron spectroscopy(XPS)analyses confirmed that the pyrolysis of polydopamine(PDA)not only improves electrode conductivity but also contributes to the formation of a stable solid electrolyte interface(SEI).Additionally,SiOx undergoes dispro-portionation reactions during the pyrolysis of PDA,further the improves the cyclic stability of the composites.Consequently,the 1000-SiOx/NC composite electrode exhibited an impressive specific capacity of 783.4 mAh·g-1 after 500 cycles at 1 A g-1,maintaining 80.1％of its initial capacity.Additionally,at a high rate of 3 C,its capacity reached 607.3 mAh·g-1 The synthesis approach is both straightforward and economical,offering a fresh avenue for the widespread commercial deployment of SiOx.
Haihui Liu、Qiang Xu、Xiao Zhang、Shuliang Lv、Chang Ma
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State Key Laboratory of Separation Membranes and Membrane Processes,Tianjin Key Laboratory of Advanced Fibers and Energy Storage,School of Materials Science and Engineering,Tiangong University,Tianjin 300387,P R.China
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