【摘要】 以煤焦油沥青为碳源、三丁基氯化锡(TBTC)为锡源,采用压力下聚合手段原位合成出Sn/C复合材料,并对它的电化学性能进行了研究。通过SEM、XRD、恒电流充放电测试等手段研究了不同Sn含量的Sn/C复合材料的形态、结构及其电化学行为,结果表明TBTC对沥青的热缩聚反应有显著的催化作用,热聚产物中吡啶不溶物(PI)组分的含量由未添加时的35.5%逐渐提高至添加量为25%时的60.3%;进一步热处理后,Sn/C复合材料中的锡由原来的SnS转化为金属锡的形式存在;其首次循环效率随着热处理温度的提高而增加,而首次充放电容量随着TBTC添加量的增加先增加后减少,在10%时达到最大的比容量值,首次充放电容量分别为674mAh/g和465mAh/g,第二次循环后,循环效率达到95%以上,是一种性能较佳的锂离子蓄电池负极材料。更多还原

【Abstract】 A series of Sn/C composites was prepared by thermal condensation of coal tar pitch and tributyltin chloride (TBTC) with different proportions. The microstructure and electrochemical performance were characterized by SEM, XRD and charge-discharge measurement. Results show that TBTC can catalyze thermal condensation of pitch and make the PI content of condensation product increase gradually from 35.5%(mass percentage)at zero TBTC addition to 60.3% at 25% TBTC addition. The sample containing 10% TBTC and carbonized at 600 ℃ shows a good anode properties for lithium ion battery, whose charge and discharge capacities are 674 mAh/g and 465 mAh/g, respectively, and the efficiency of charge-discharge achieves 95% after the second cycle.更多还原