Enabling High-Performance Sodium Battery Anodes by Complete Reduction of Graphene Oxide and Cooperative In-Situ Crystallization of Ultrafine SnO_(2)Nanocrystals  

作　　者：Junwu Sang Kangli Liu Xiangdan Zhang Shijie Zhang Guoqin Cao Yonglong Shen Guosheng Shao 

机构地区：[1]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [2]State Centre for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM),Zhengzhou University,Zhengzhou 450001,China [3]Zhengzhou Materials Genome Institute(ZMGI),Xingyang,Zhengzhou 450100,China [4]Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education,School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Energy & Environmental Materials》2023年第3期356-365,共10页能源与环境材料（英文）

基　　金：funded by the Zhengzhou Materials Genome Institute,the National Talents Program of China,and Key Innovation Projects of the Zhengzhou Municipal City of China.

摘　　要：The main bottleneck against industrial utilization of sodium ion batteries(SIBs)is the lack of high-capacity electrodes to rival those of the benchmark lithium ion batteries(LIBs).Here in this work,we have developed an economical method for in situ fabrication of nanocomposites made of crystalline few-layer graphene sheets loaded with ultrafine SnO_(2)nanocrystals,using short exposure of microwave to xerogel of graphene oxide(GO)and tin tetrachloride containing minute catalyzing dispersoids of chemically reduced GO(RGO).The resultant nanocomposites(SnO_(2)@MWG)enabled significantly quickened redox processes as SIB anode,which led to remarkable full anode-specific capacity reaching 538 mAh g^(−1)at 0.05 A g^(−1)(about 1.45 times of the theoretical capacity of graphite for the LIB),in addition to outstanding rate performance over prolonged charge–discharge cycling.Anodes based on the optimized SnO_(2)@MWG delivered stable performance over 2000 cycles even at a high current density of 5 A g^(−1),and capacity retention of over 70.4%was maintained at a high areal loading of 3.4 mg cm^(−2),highly desirable for high energy density SIBs to rival the current benchmark LIBs.

关 键 词：in situ compositing microwave reduced graphene oxide sodium ion battery sodium ion battery anode ultrafine SnO_(2)nanocrystals 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]