Poly-dopamine coated graphite oxide/silicon composite as anode of lithium ion batteries

Abstract PDA/GO-Si composite is synthesized and tested as anode material for lithium ion batteries. Silicon nanoparticles were first cooperated with graphite oxide (GO) and then embedded into a poly-dopamine (PDA) layer.PDA provides accommodation of volume change and protection to prevent the direct contact of the Si surface with electrolyte during charge/discharge cycling. GO acts as both volume change buffer and conductive support for the electrode. An initial discharge capacity of 2903 mAh•g − 1 was realized. A capacity of 1300 mAh•g − 1 was maintained after 450 cycles. The excellent capacity reversibility and long-term cycling stability of PDA/GO-Si was attributed to the intelligent structure and composition of the synthesized material.