BAI Xue-Jun;LIU Chan;HOU Min;WANG Biao;CAO Hui;FU Jun-Jie
Shanghai Aerospace Power Technology Co., LTD;Shanghai Aerospace Power Technology Co., LTD;Shanghai Aerospace Power Technology Co., LTD;College of Material Science and Engineering, Donghua University;Shanghai Aerospace Power Technology Co., LTD;Shanghai Institute of Space Power Source;Shanghai Geophysical Branch, Sinopec Offshore Oilfield Services Company
Porous 2D Silicon/CNTs/Graphene free-standing composites were prepared via a solution-based self-assembly process with vapor post-treatment and applied as anodes for lithium-ion batteries. Silicon nanoparticles (~50 nm) as active materials were uniformly embedded between graphene sheets without agglomeration. Graphene was used as electrical conductive carbon matrix to form a 2D conductive network for electrons. CNTs, with high electrical conductivity and mechanical strength, formed a scaffold along with graphene to enhance the conductivity and mechanical properties of the carbon matrix. After vapor post-treatment, CNTs supported graphene film transferred from a tightly stacked film to a loose packed porous film. The porous structure of this free-standing composite anode provides large internal space to accommodate volumetric changes and provide abundant channels for diffusion of Li +, fast electron transport and easy penetration of electrolyte. The composites exhibite an outstanding rate performance and cyclic stability, delivering a capacity of 600 mAh/g at 4 A/g and 1 010 mAh/g after 100 cycles at 0.1 A/g. They also show high structure and mechanical stability after cycle test. It provides an exciting pathway to the rational design and fabrication of silicon anode and 2D graphene matrix for applications in lithium-ion batteries.
graphene;silicon;lithium-ion battery;free-standing;vapor post-treatment
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