Fabrication of C@Si@G for flexible lithium-ion batteries

•A sandwich structure of C@Si@G is put out.•Every C@Si fiber is wrapped by single layer G (graphene) to constrain the volume expansion of Si (silicon).•Natural cocoon silk is applied as carbon-sourced substrate.•The as-prepared flexible C@Si@G composite is directly used as Li-ion anode without Coppe...

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