Graphite oxide (GO) modified Sn/C composite for lithium ion battery anode

Tin particles were loaded into carbon matrix to form Sn/C composite for improving the cycling stability meanwhile the capacity of the composites were poor due to the low content of tin.Considering to enhance the performance of the Sn/C composites that were prepared by hydrothermal treatment from the resorcinol-formaldehyde(RF) gel in which tin tetrachloride was coated to form the organic tin precursor,graphite oxide(GO) was introduced to modify the preparation.The modification could reinforce the combination between the tin particles and carbonaceous buffer matrix.Cyclic voltammetry(CV) curves indicated that the irreversible converting in the process of the intercalation/extraction of Li+ decreased after modification.The diffusion coefficiency of Li+ in the modified composite increased from the analysis of the electrochemical impedance spectroscopy(EIS).The capacity of the modified Sn/C composites remained 270mAh/g after 90cycles,and the ratio of the retention capacity was trend to 100% after 35cycles.