Hierarchical SnO_2 nanoflowers assembled by atomic thickness nanosheets as anode material for lithium ion battery  

多级结构SnO2纳米花作为高性能锂离子电池负极材料（英文）

作　　者：宋凌霄 杨胜杰 魏伟 瞿鹏 徐茂田 刘英 

机构地区：[1]College of Chemistry and Molecular Engineering, Zhengzhou University [2]School of Chemistry and Chemical Engineering, Shangqiu Normal University [3]The Nuclear Industry Geological Bureau of Henan Province

出　　处：《Science Bulletin》2015年第9期892-895,M0004,共5页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21475085,21271125 and B010601);the Innovation Scientists and Technicians Troop Construction Projects of Henan Province,Program for Innovative Research Team in Science and Technology in University of Henan Province(2012TRTSTHN018)

摘　　要：Hierarchical SnO2 nanoflowers assembled by atomic thickness nanosheets were prepared by facile one-pot solvothermal method with acetone/water mixture as solvent. The crystal structure, morphology and the microstructure of the as-prepared products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and atomic force microscope （AFM）. Results revealed that the nanoflowers （2-4 μm） were assembled by the ultrathin SnO2 nanosheets （3.1 nm esti- mated by AFM）. When tested as anode material for lithium ion batteries, the SnO2 nanoflowers showed improved cy- cling stability comparing with the commercial SnO2 parti- cles. The reversible charge capacity of SnO2 nanoflowers maintained 350.7 mAh/g after 30 cycles, while that of the commercial SnO2 was only 112.2 mAh/g. The high re- versible capacity and good cycling stability could be ascri- bed to the hierarchical nanostructure, atomic thickness nanosheets and large surface area of the SnO2 nanoflowers.便携式电子设备和电动汽车等的发展对高性能电池的需求日益迫切.锂离子电池由于其高能量密度、长循环寿命、环境友好等优点受到广泛关注.决定锂离子电池性能的重要因素是电极材料.Sn O2因其具有较高的理论容量、较低的嵌锂电压,常被用作负极材料.但是商品化Sn O2在嵌/脱锂过程中引起的体积变化会导致材料的聚集和粉末化,使材料的电化学性能大大减弱.构建纳米结构的Sn O2可以缓解这个问题.最近的研究表明二维原子层厚度纳米片具有优异的电化学性能,由此我们得到启发,通过一步溶剂热法合成了原子层厚度纳米片组装而成的Sn O2纳米花.该纳米花用作锂离子电池负极材料,显示出较大的可逆容量和良好的循环性能.Sn O2纳米花良好的电化学性能与Sn O2纳米花具有疏松结构、超薄原子层厚度的纳米片、大的比表面积等有关.与商品化Sn O2相比较,Sn O2纳米花电化学性能得到显著提高.

关 键 词：SnO2 Nanoflowers Atomic thickness Lithium ion battery 

分 类 号：TM912[电气工程—电力电子与电力传动] TH742[机械工程—光学工程]