ZnWO_4 nanocrystals/reduced graphene oxide hybrids:Synthesis and their application for Li ion batteries  

作　　者：WANG Xiao LI BoLong LIU DaPeng XIONG HuanMing 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization [2]Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [3]Department of Chemistry, Fudan University

出　　处：《Science China Chemistry》2014年第1期122-126,共5页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of Chi-na(2013CB934101);the National Natural Science Foundation of China(20901075,21271045 and 51272249);the Opening Fund of State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences(RERU2013001)

摘　　要：ZnWO4,as an environment-friendly and economic material,has the potential for Li ion batteries(LIB)application.In this paper,a facile method has been developed to synthesize ZnWO4supported on the reduced graphene oxide(RGO)to improve its LIB performance.The cuboid-like ZnWO4nanocrystals are prepared by directly adding Na2WO4 powders into the graphene oxide/Zn aqueous solution followed by a hydrothermal treatment.The high-resolution TEM,XRD and XPS characterizations were employed to demonstrate structural information of the as-prepared ZnWO4/RGO hybrids carefully.Besides,we also discussed the LIB properties of the hybrids based on the detailed galvanostatic charge-discharge cycling tests.As a result,the specific capacity of the as-prepared ZnWO4/RGO hybrids reached more than 477.3 mA h g 1after 40 cycles at a current density of 100 mA g 1(only less than 159 mA g 1for bare ZnWO4).During the whole cyclic process,the coulombic efficiency steadily kept the values higher than 90%.ZnWO4,as an environment-friendly and economic material,has the potential for Li ion batteries（LIB）application.In this paper,a facile method has been developed to synthesize ZnWO4supported on the reduced graphene oxide（RGO）to improve its LIB performance.The cuboid-like ZnWO4nanocrystals are prepared by directly adding Na2WO4 powders into the graphene oxide/Zn aqueous solution followed by a hydrothermal treatment.The high-resolution TEM,XRD and XPS characterizations were employed to demonstrate structural information of the as-prepared ZnWO4/RGO hybrids carefully.Besides,we also discussed the LIB properties of the hybrids based on the detailed galvanostatic charge-discharge cycling tests.As a result,the specific capacity of the as-prepared ZnWO4/RGO hybrids reached more than 477.3 mA h g 1after 40 cycles at a current density of 100 mA g 1（only less than 159 mA g 1for bare ZnWO4）.During the whole cyclic process,the coulombic efficiency steadily kept the values higher than 90%.

关 键 词：ZnWO4 graphene hybrid Li-ion battery anode 

分 类 号：TM912[电气工程—电力电子与电力传动]