非晶碳纳米管新型锂离子电池负极材料

Amorphous carbon nanotubes as new anode material for lithium ion batteries

研究了非晶碳纳米管作为锂离子电池负极材料的电化学行为以及氧化处理对其嵌锂容量的影响.结果表明:在20 mA·g^(-1)的充放电条件下,原始非晶碳纳米管首次可逆容量为305 mAh·g^(-1);在300-450℃氧化处理后,非晶碳纳米管中的氧和氢氧根中和了管壁中的大量不饱和键,非晶碳纳米管中死锂的位置减少,纯度提高,嵌锂可逆容量增加.在300℃氧化处理的非晶碳纳米管首次可逆容量最高可达533 mAh·g^(-1),并有良好的循环寿命.

The electrochemical performances of ACNTs as anode materials of lithium ion battery and the capacity change of lithium ion intercalation after oxidation were investigated. The results indicate that as-grown ACNTs possess the initial reversible capacity of 305 mAh·g^-1 under the chargedischarge condition of 20 mA.g^-1. Through oxidization treatment at the temperature range of 300- 450℃, oxygen atoms and hydroxyls neutralize many unsatisfied bonds in the tube walls, the positions of dead lithium are reduced and the purification of the ACNTs is improved, which lead to the increase of the reversible intercalation capacity. The first reversible capacity of ACNTs oxidized at 300℃ increases to 533 mAh·g^-1 and the cycle life is well.