CAJ | 학술논문

采用碳热还原法制备了Sn/C复合材料,通过XRD、SEM、恒流充放电循环、慢速扫描循环伏安(CV)等方法对材料以及其电化学嵌脱锂性能做了研究.结果表明:Sn球均匀分散在絮状碳材料中,加热时间越长,Sn球粒径越大.加热8 h得到材料的首次嵌锂比容量可达1014 mAh·g-1,循环15周以后的嵌锂比容量为406 mAh·g-1.
채용탄열환원법제비료Sn/C복합재료,통과XRD、SEM、항류충방전순배、만속소묘순배복안(CV)등방법대재료이급기전화학감탈리성능주료연구.결과표명:Sn구균균분산재서상탄재료중,가열시간월장,Sn구립경월대.가열8 h득도재료적수차감리비용량가체1014 mAh·g-1,순배15주이후적감리비용량위406 mAh·g-1.
Electrochemical active Sn/C composites were synthesized by carbon-thermal reduction method from SnO2 and C in Ar atmosphere at 950 C. The obtained composites were characterized by XRD and SEM. Lithium insertion/ extraction characteristics of the composites were examined by constant current charge-discharge and cyclic voltammetry methods(CV). The results show that Sn metal spheres are embedded in excessive flocculent carbon matrix homogeneously. The average size of Sn spheres becomes larger after heating for a longer time. Sn/C composite heated for 8 h exhibits initial lithium insertion specific capacity of 1 014 mAh .g-I and the highest reversible lithium insertion specific capacity of 406 mAh·g-1 after 15 cycles coupled with a reasonable capacity retention(4%loss/cycle).