中文摘要：

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。

英文摘要：

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.