氧化镍/碳@碳纳米管负极材料的制备及储锂性能(英文)  

Preparation and Lithium Storage Performance of NiO/ C@CNT Anode Material

作　　者：周佳盼[1] 米红宇[1] 王吉德[1] 崔青霞[1] 仲佳亮 

机构地区：[1]新疆大学石油天然气精细化工教育部重点实验室,新疆乌鲁木齐830046

出　　处：《稀有金属材料与工程》2015年第9期2109-2113,共5页Rare Metal Materials and Engineering

基　　金：Xinjiang Uygur Autonomous Region University Scientific Research Project(XJEDU2012I05);National Natural Science Foundation of China(21162027,21063013)

摘　　要：将核壳的聚吡咯基的碳@碳纳米管(C@CNT)与纳米片组装的氧化镍(Ni O)微球结合,制备了一种多孔的锂离子电池负极材料(Ni O/C@CNT),该材料(Ni O/C@CNT)与纯的Ni O和Ni O/CNT相比,其容量值和循环稳定性能明显提高。在50 m A·g-1的电流密度下,经过20次循环后,其可逆容量达到573 m A·g-1,容量保持率为68.6%。这些性能的提高是由于核壳结构的C@CNT的导电缓冲性引起的。C@CNT具有诸如多孔结构、大比表面积、高电化学活性、高电子导电性和良好的浸润性等许多优点,这些优点有利于避免电极材料显著的体积变化,因此在锂嵌入和脱出过程中可减少电极容量衰减并提高传质速率。Core-shell polypyrrole-based carbon@carbon nanotube（C@CNT） was incorporated into nanosheet-assembled Ni O microsphere to produce a porous hybrid（Ni O/C@CNT） as an anode in lithium secondary batteries. Results show that the resultant Ni O/C@CNT exhibits the enhanced capacity and cyclic stability compared with pure Ni O and Ni O/CNT. The hybrid delivers a reversible capacity of 573 m Ah·g-1 at a current density of 50 m A·g-1 over 20 cycles with a capacity retention of 68.6%. The performance improvement results from the conductive buffering of core-shell C@CNT. It is likely that many benefits of C@CNT such as porous structure, large surface area, high electrochemical activity, high electron conductivity and good wettability, facilitate to avoid significant volume change and thus decrease the capacity fading of the electrode during lithiation and delithiation, as well as enhance the mass transfer efficiency.

关 键 词：氧化镍微球 碳@碳纳米管 可逆容量 锂离子二次电池 

分 类 号：TM912[电气工程—电力电子与电力传动]