Abstract：A new approach was proposed to modify the surface structure of natural graphite by use of polymer adsorption and thereby to improve the initial charge-discharge efficiency of natural graphite anode in Li-ion battery. The experimental result showed that the surface modification of graphite anode by polydimethylsiloxane could effectively suppress the initial irreversible reactions and accelerated the SEI film formation, and therefore greatly improved the first charge-discharge efficiency. In comparison with the bare graphite electrode, the modified graphite electrode exhibited a 13%-reduced irreversible capacity in the first charge-discharge cycle, while the reversible capacity almost remained unchanged. In addition, the surface modification also improved the cycling stability during subsequent cycles.
