Na_(0.44)MnO_2纳米棒/石墨烯正极的制备和电化学储锂性能  

Preparation and electrochemical lithium storage properties of Na_(0.44)MnO_2 nanorods/graphene cathode

作　　者：刘才[1,2] 王丽媛[1] 李建刚[1] 冀德坤[1] 焦玉海[1] 张荣月[1] 徐文星[3] 

机构地区：[1]北京石油化工学院化学工程学院,北京102617 [2]恩泽生物质精细化学品北京市重点实验室,北京102617 [3]北京石油化工学院信息工程学院,北京102617

出　　处：《化工学报》2017年第3期1116-1121,共6页CIESC Journal

基　　金：国家自然科学基金项目(61304217);北京市教育委员会科技计划项目(KM201510017001;KM201510017003)~~

摘　　要：以KMnO_4、MnSO_4和NaOH为初始原料,利用水热软化学法制备Na_(0.44)MnO_2。XRD证实该材料具有S形孔道结构,TEM表征表明这是一种单晶纳米棒,可能有利于制备高性能正极材料。同时利用Hummers法制备石墨烯作为导电剂,通过搅拌法混合电极材料制备正极涂片。电化学测试研究显示随着的石墨烯添加量的增大,电池容量和倍率性能均得到提高。当石墨烯含量达到45%时,在0.1 A·g^(-1)电流密度下电池容量达到192.5 m Ah·g^(-1),在2.0 A·g^(-1)倍率电流密度下,其容量依然保持在123.4 m Ah·g^(-1),说明该电极材料有潜力应用于下一代高性能电池当中。Na_（0.44）MnO_2 nanorods were prepared from KMnO_4, MnSO_4 and Na OH as initial raw materials by hydrothermal soft chemical method. XRD confirmed that the products have S-shaped channel structure, and TEM characterization indicates that Na_（0.44）MnO_2 nanorods is single-crystal structure, which can be suited for preparation of high performance cathode material. Graphene prepared by hummer method were used as conductive agent. Electrochemical test research shows that the capacity, cycle and rate performance of Na_（0.44）MnO_2 nanorods/graphene are improved with the increase of the amount of graphene. When the content of graphene reached to 45%, the capacity of electrode is up to 192.5 m Ah·g（-1） at the current density of 0.1 A·g（-1）. In the rate test, the capacity of electrode is still located at 123.4 m Ah·g（-1） at the current density of 2.0 A·g（-1）, and it indicates that these electrode materials have potential application in the next generation of advanced batteries.

关 键 词：水热 制备 纳米材料 石墨烯 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]