【摘 要】
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Unstable solid-electrolyte interphase(SEI)and particle fracture have been regarded as primary reasonsfor the capacity attenuation of silicon-based anodes [1,2] Pioneering researches have shown that do
【机 构】
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Semiconductor Photonics Research Center Department of Physics,Xiamen University Xiamen 361005
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Unstable solid-electrolyte interphase(SEI)and particle fracture have been regarded as primary reasonsfor the capacity attenuation of silicon-based anodes [1,2] Pioneering researches have shown that downsizingto the nanoscale allows for the silicon to accommodate the large volume change without fracture.However,the electrochemical performance is still limited due to the uncontrolled solid-electrolyte interphase(SEI on the surface.To build a stable SEI layer,an electrolyte isolated layer and an internal void space need to bedesigned.Recently,Si/C composites with structure engineering including Si-C yolk structure,pomegranatestructure and carbon-coated porous silicon have shown promising results [3-5] However,the capacity stilldegraded seriously in the first several cycles due to the inherently weak contact between Si and carbon [6].
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