The Design,Synthesis and Electrochemical Performance of the Modification of Natural Graphite Anode Materials by H_3PO_4

The natural graphite was processed with technology of graphite intercalation componds(GICs),made sure that phosphoric acid has got into the surface of graphite layer,and coated with a layer of organic amine intermediates on the surface of graphite.Then the graphite was processed by high-temperature treatment under the inert atmosphere.The results showed that the interlayer space of the samples was increased and primary structure of the samples was retained which broadened the channels of Li+transference and also reserved the room for expanding of the samples.Using this sample as anode material of lithium-ion batteries,H3PO4 modified sample has got smaller irreversible capacity and higher coulombic effciency as well as the rate capacility.