【摘要】 兼顾Sn/C复合物循环稳定性的同时为了提高其容量,采用氧化石墨(GO)修饰间苯二酚-甲醛凝胶(RF)包覆SnCl4得到前驱化合物并进行水热处理制备改性Sn/C复合物。改性后Sn颗粒与碳基底之间结合更好。循环伏安曲线表明,改性的复合物中Li+在脱嵌时的不可逆变化减小;通过交流阻抗测试结果计算出Li+在改性后的复合物中有着更高的扩散系数;90次循环之后其容量仍能保持在270mAh/g以上,35次循环后的容量保持率接近100%。更多还原

【Abstract】 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.更多还原