锂离子蓄电池纳米SnO2负极材料初步研究

以无机原料为前体,采用溶胶 凝胶法制备了SnO2干凝胶,经不同温度下的热处理得到不同晶粒尺寸的纳米SnO2超细粉。用热重 差热分析(TG DTA)、红外光谱(IR)、X射线衍射分析(XRD)、透射电镜(TEM)等对SnO2粉末进行了表征,结果表明,该工艺制得的SnO2超细粉具有金红石结构,粒径分布均匀,经550℃热处理所得SnO2粉末平均粒径为10nm左右。将该法制得的纳米SnO2粉末作为锂离子蓄电池负极材料,可逆容量高(达600mAh·g-1),嵌脱锂电压低(0.2～0.5V),循环性能良好,说明纳米SnO2是一种很有潜力的锂离子蓄电池负极材料。     

Preparation and electrochemical properties of nanosized tin dioxide electrode material by sol-gel process

1　INTRODUCTIONTinoxideisawideenergy gapsemiconductorandhasfoundmanytechnologicalapplicationssuchascatalystsforoxidationoforganics,solid stategassen sorsandopticalelectronicdevices[1,2 ] .Recently ,sev eraltin oxide basedcompoundswerereportedtobegoodcandidatesasanodesforlithiumionbatteriesin steadofcarbonaceouselectrodes[36 ] ,theelectro chemicalreactionoccurringinthesecompoundsisnottheintercalationoflithiumintoahoststructure .Forbulksamplesofamorphousandcrystallinetinoxide ,adecomposition…