Na2Ti3O7@CNT钠离子电池负极材料的性能研究

摘要

用低温水热法合成具有高电导率的Na2Ti3O7@CNT纳米复合材料,通过扫描电镜、XRD等手段表明Na2Ti3O7颗粒包覆在碳纳米管表面形成纳米复合材料. 在电化学测试中Na2Ti3O7@CNT可逆容量达到210 mAh g-1,并在30C高倍率放电情况下,比容量仍然保持在50 mAh g-1,表明Na2Ti3O7@CNT作为钠离子电池负极材料具有很好的容量和倍率性能.%Na2Ti3O7@CNT nano composites with enhanced conductivity were synthesized by low temperature hy?drothermal reaction. By means of SEM and XRD methods, nano structures of Na2Ti3O7 covered by CNT were identified. Electrochemical tests show that Na2Ti3O7@CNT can deliver a reversible capacity of 210 mAh g-1, in particular, at the high rate of 30 C, specific capacity can still reach 50 mAh g-1. The results show that Na2Ti3O7@CNT nano composite has demonstrated favorable specific energy and power capability.