摘要
以氧化石墨和氯化亚锡为原料,采用原位合成法制得SnO2/石墨烯纳米复合材料。该方法不需外加还原剂,也避免了SnO2纳米粒子和石墨烯在机械混合过程中的团聚问题。XRD和TEM等的分析结果表明,纳米SnO2颗粒都均匀地分散在石墨烯表面,其中纳米SnO2的粒径和石墨烯的厚度分别为3-6 nm和1.5-2.0 nm。电化学测试结果表明：在200 mA/g电流密度下循环100次后,SnO2/石墨烯负极材料的嵌锂容量可稳定在552 mAh/g,容量保持率比单纯纳米SnO2提高了4.4倍;在40、400、800 mA/g的电流密度下,SnO2/石墨烯负极材料的放电容量可分别保持在724.5、426.0、241.3 mAh/g,表现出较好的倍率性能,该结果归因于石墨烯良好的导电性及其二维纳米结构。
SnO2/graphene nanocomposites were in-situ prepared by using graphite oxide and SnC12.2H2O as raw material, in which external reducing agent is not required. Compared with mechanical mixing method, it can avoid the congregation of SnO2 nanoparticles and graphene. The analysis results （XRD, TEM, etc） indicate that SnO2 nanoparticles are homogeneously dispersed on the surface of graphene layers with a particle size of 3-6 nm, and the thickness of graphene layers is about 1.5-2 nm. The main electrochemical performance can be concluded as follows 1） The discharge capacity of SnO2/graphene anode electrode after 100 cycles at 200 mA/g, remains at 552 mAh/g, and the capacity retention is 4.4 times of bare SnO2. 2） The discharge capacities of SnO2/graphene anode electrode at 40, 400 and 800 mA/g are 724.5, 426.0 and 241.3 mAh/g, respectively. The excellent rate capability should be attributed to the high electric conductivity and two-dimensional nanostructures of graphene.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第5期515-520,共6页
Journal of Inorganic Materials
基金
国家自然科学基金(51002051,20806024,50672025,5073003)
中央高校基本科研业务费专项基金(WA1014016)~~
关键词
二氧化锡
石墨烯
负极材料
锂离子电池
tin oxide （SnO2）
graphene
anode material
lithium-ion battery
