【摘要】 研究了将纳米碳管用于锂离子电池负极材料的嵌锂机理,包括纳米碳管的充放电容量、充放电前后碳纳米管的IR光谱、循环伏安曲线和充放电过程中的XRD图谱研究。研究结果表明,纳米碳管具有比较高的放电容量,首次放电比容量为649.4mA·h/g,循环20次后充放电效率仍可达94.1%。IR光谱研究表明纳米碳管的充放电过程中在电极界面存在SEI膜;循环伏安法研究表明碳纳米管负极随着循环次数增加,不可逆容量减少,锂离子的嵌入与脱出更加可逆;XRD分析则说明在充放电过程中d002增大,有越层反应发生。更多还原

【Abstract】 The paper discussed the intercalation Li mechanism of carbon nano-tubes used in the negative materials of lithium ion battery through the charge-discharge capacity measurement, FTIR spectrum, cyclic voltammetric curves and XRD during charge-discharge. The results showed that the first specific discharge capacity was 649.4mAh·g^-1 and the recycle capacity maintaining efficiency was 94.1% after 20times. The mechanism of forming solid-electrolyte-interphase （SEI） film was determined by FTIR spectrum measurement. The charge-discharge mechanism was discussed by cyclic voltammetric curves. It showed that irreversible capacities decrease gradually as the recycle time increases. It was found that the layer distance value (d₀₀₂) of carbon nano-tubes increases during charge-discharge and there was inserted layer reaction.更多还原