摘要
以氯化亚锡和天然石墨为原料,通过化学沉积和高温烧结制备二氧化锡/石墨复合材料。材料表征发现,纳米二氧化锡颗粒(约50 nm)均匀沉积在石墨鳞片表面。纳米二氧化锡颗粒作为储锂母体可有效缓解体积效应。石墨鳞片作为SnO2颗粒的载体,不仅使得SnO2分散更加均匀,还能有效地抑制锡颗粒充放电时发生团聚和粉化,提高材料的循环稳定性。实验分析了不同组成的SnO2/石墨复合材料的电化学性能。结果表明,制备的材料表现出优异的电化学性能,其在100 mA/g的电流密度下循环时,比容量保持在450 mAh/g以上;在2.4 A/g的电流密度下循环的可逆比容量也在230 mAh/g以上。
SnO2/graphite composite material was synthesized via chemical deposition and high-temperature sintering using SnO and natural graphite as raw materials. The characterized results show that Nano-sized SnO2 particles （ - 50 nm） are highly dispersed on the surface of graphite flake which acts as lithium storage matrix, therefore, volume changes are effectively suppressed. As the deposition substrate of SnO2 particles, graphite flake can also restrain aggregation and pulverization of tin particles during charging and discharging, so cyclic performance of composite materials is improved. The electrochemical performance of different composite SnO2/graphite materials was analyzed by experiment. The results show that the SnO2/graphite composite material has perfect electrochemical performance, respectively remaining reversible capacities of 450 and 230 mAh/g at the current densities of 0.1 and 2.4 A/g.
出处
《电源技术》
CAS
CSCD
北大核心
2014年第6期1045-1047,1189,共4页
Chinese Journal of Power Sources
基金
国家自然科学基金(51272128
50972075)
湖北省杰出青年基金(Q20111209)
关键词
锂离子电池
负极材料
二氧化锡
石墨
化学沉积
Li-ion battery
anode material
tin oxide
graphite
chemical deposition
