锂离子电池Sn-Co-C复合负极材料的合成与研究  

Synthesis and study of Sn-Co-C microsphere composite anode materials for Li-ion battery

作　　者：闫润宝[1,2] 任建国[2] 赵海雷[1] 何向明[2] 蒲薇华[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《电源技术》2010年第8期803-806,共4页Chinese Journal of Power Sources

基　　金：国家"973"项目(2007CB209705);国家自然科学基金项目(50772057)

摘　　要：以纳米金属氧化物和酚醛树脂为原料,采用喷雾干燥法得到前驱体,经高温碳热还原后制备了核壳结构的Sn-Co-C复合负极材料。通过XRD、SEM和TEM分析表明,生成的纳米尺度的Sn-Co合金颗粒均匀分布于碳微球内部。恒流充放电测试表明Sn-Co-C复合负极材料,首次可逆比容量为391 mAh/g,经过100次循环后比容量为307.1 mAh/g,容量保持率为78.5%。由于碳微球对纳米合金颗粒的分散包覆,缓解了充放电时的体积膨胀,抑制了纳米合金颗粒的团聚,从而使其具有较高的可逆比容量和较好的循环性能。The core-shell structured Sn-Co-C microsphere composite anode materials were synthesized by spray drying and carbothermal reduction using nano-metal oxide and phenolic resin as raw materials.The characterization of XRD pattern,SEM and TEM images show that nano-sized Sn-Co alloy particles are homogeneously encapsulated by carbon matrix.The galvanostatic tests of charge and discharge indicate that the initial reversible capacity is 391 mAh/g,and it retains 307.1 mAh/g after 100 cycles,with capacity retention of 78.5%.The high reversible capacity and good cycling performance are obtained because the carbon microsphere prevents the aggregation of nano-alloy particles and alleviates the volume expansion/contraction during charging/discharging process.

关 键 词：锂离子电池 喷雾干燥法 复合合金负极 碳热还原 

分 类 号：TM912.9[电气工程—电力电子与电力传动]