采用湿化学法对碳纳米管(CNT)进行填充,通过控制锡溶液浓度制备出SnO2含量为25%、44%和65%的填充型SnO2-in-CNT复合材料,并对复合材料进行了电化学储锂性能测试和微观组织观察.结果表明:多壁碳纳米管的适宜活化温度为700℃,使用活化后的碳纳米管可以得到填充形态良好的SnO2-in-CNT复合材料,复合材料的储锂可逆容量随着SnO2含量的增加而增大;在50 mAg-1电流密度下SnO2含量为65%时的SnO2-in-CNT复合材料在首次充放电后具有最高的首次库伦效率.
The carbon nanotubes (CNTs) were filled with tin dioxide by wet-chemical method, and SnO2-in-CNT composites with 25%, 44%, and 65% of SnO2 were prepared by controlling the concentra-tion of tin solution. The lithium storage performance and microstructure of the composites were tested and observed. The results show that the suitable activation temperature for multiwall carbon nanotube is 700℃. The good form SnO2-in-CNT composites could be obtained by using the activated carbon nano-tubes, and the reversible lithium storage capacity of the composites increases with the increase of SnO2 content. When the content of SnO2 is 65%, the SnO2-in-CNT composite has the highest first coulomb effi-ciency after first charge and discharge under the current density of 50 mAg-1.
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