中空核壳结构α-MoO_3-SnO_2复合电极可控制备及储锂性能研究  

Morphology-controlled Synthesis of Hollow Core-shell Structural α-MoO_3-SnO_2 with Superior Lithium Storage

作　　者：王亚朋[1] 刘佳佳[1] 刘春晓[1] 陈伟伟[1] 李婷婷[1] 郭洪[1] 

机构地区：[1]云南大学化学科学与工程学院,昆明650091

出　　处：《无机材料学报》2015年第9期919-924,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51474191);国家重点基础研究发展规划(973计划)(2014CB643406)~~

摘　　要：采用醇热技术可控制备了中空核壳结构α-MoO3-SnO2二次锂离子电池复合负极材料。通过XRD、SEM、TEM、CV和恒流充放电等测试手段对材料结构、形貌和电化学性能进行了表征。结果表明:构建的多元金属氧化物既具有电化学活性成分,又含有骨架支撑部分,独特的中空结构有效地缩短了电子和锂离子传输路径。电化学测试表明:该材料在电流密度50 m A/g时循环100次后放电比容量仍高达865 m Ah/g。在电流密度为1000 m A/g时循环100次后放电比容量仍达到545 m Ah/g,表现出优异的循环性能和倍率性能。该合成方法简单、成本低,产量高,可为制备其它中空核壳结构先进功能材料提供借鉴。An effective approach of alcoholysis was employed to prepare hollow core-shell MoO3-SnO2 hybrid nanoparticle aggregates as anode materials for Li-ion batteries. The as-prepared samples were characterized by XRD, SEM, TEM, CV, and galvanostatical method. The results show that the unique hollow structures can shorten the distance Li-ion diffusion, and the hollow structure offers a sufficient void space, which sufficiently alleviates the mechanical stress caused by volume change. The as-obtained hollow core-shell MoO3-SnO2 hybrid electrodes can retain a discharge capacity of 865 m Ah/g at current density of 50 m A/g after 100 charge-discharge cycles. Even at the current density of 1000 m A/g, the MoO3-SnO2 hybrid electrodes can still deliver a high reversible discharge capacity of 545 m Ah/g. Therefore, the hollow MoO3-SnO2 hybrid electrode exhibits stable cyclability and good rate capability. This method is simple, low cost and mass-productive, and may also be used to prepare other advanced functional materials.

关 键 词：二氧化锡 三氧化钼 中空核壳材料 纳米结构 电化学 

分 类 号：TQ174[化学工程—陶瓷工业]