Silicon is an active electrode material for future commercial lithium-ion batteries with extremely high theoretical specific capacity (4200 (mA·h)/g). However
the large volume change of silicon over charge-discharge cycles weakens its competitiveness in the capacity and cycle life. A flexible self-supporting polydiene dimethylammonium chloride-Si/graphene (PDDA-Si/G) nanocomposite film was successfully prepared by electrostatic self-assembly technique. The composite film can maintain the integrity of electrode structure without adding binder and conductive carbon black. Graphene provides complete conductive network and mechanical toughness. The electrochemical test results show that when the current density was 0.2 A/g
the specific capacity of PDDA-Si/G composite could reach 1439.9 (mA·h)/g and the Coulombic efficiency was above 98%. The specific capacity was 1209.3 (mA·h)/g after 80 cycles. The specific capacity still maintained 499.9 (mA·h)/g at a high current density (2 A/g).
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