Sn_2Sb@ C核壳结构负极材料的制备与性能  

Preparation and performance of Sn_2Sb@ carbon core-shell structure anode material

作　　者：孙大伟[1,2] 张贝贝[1,2] 汝强[1,2] 胡社军[1,2] 

机构地区：[1]广东省高等学校量子信息技术重点实验室,华南师范大学物理与电信工程学院,广东广州510006 [2]电化学储能材料与技术教育部工程研究中心,广东广州510006

出　　处：《电池》2013年第2期74-76,共3页Battery Bimonthly

基　　金：国家自然科学基金(51101062);广州市科技计划项目(2011J4100075);广东高校优秀青年创新人才培育项目(LYM09052)

摘　　要：通过改进的乳液聚合法制备氧化物溶胶,再利用热碳还原技术合成Sn2Sb@C核壳结构负极材料。β-SnSb金属间化合物和Sn单质形成Sn2Sb@C的疏松内核,表面被一层无定形碳包覆。由于疏松的内核结构和外层包覆的无定形碳壳层可缓冲电极充放电过程中的体积变化,核壳复合材料表现出稳定的循环性能。以400 mA/g的电流在0.001～2.000 V恒流循环,首次充、放电比容量分别为890 mAh/g和1 375 mAh/g,第30次循环的放电比容量为572 mAh/g。The oxide sol was prepared by modified emulsion polymerization method,then Sn2Sb@ C core-shell structure anode ma-terial was synthesized by carbothermal reduction method. β-SnSb intermetallic and element Sn formed the loosen core of Sn2Sb@ C, the surface was coated with a layer of amorphous carbon. The cycle performance of the core-shell structure composite was stable, since the loosen core structure and coated amorphous carbon layer could buffer the volume variation of the eleetrode in charge-dis-charge process. When galvanostatic cycled in 0. 001 - 2. 000 V with the current of 400 mA/g, the initial specific charge and dis-charge capacity was 890 mAh/g and 1 375 mAh/g,respectively,the specific discharge capacity in the 30th cycle was 572 mAh/g.

关 键 词：Sn2Sb@C核壳结构 热碳还原 无定形碳 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]