Enhancement of electrochemical performance of ternary material by using carbon nanotube as conductive additive

doi:10.16085/j.issn.1000-6613.2017-0578

Abstract

Abstract: Carbon nanotube(MWCNTs) was used to replace super conductive black(SP)as the conductive additive for Ternary materials(NCM),which was then used to assemble coin cells in a glove box filled with argon gas. The structure and morphology were characterized by scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The electrochemical performance was tested by a cell tester(CT-3008W-5V5mA-S4). Results showed that the discharge capacity of NCM with a loading of 5% MWCNTs reached 179mA·h/g and 167mA·h/g at 0.1C for the first run and after 30th cycles,respectively. This showed increases of discharge capacity by 9.9% and 8.4% compared that with 5% addition of SP. The performance of the electrodes was further improved through enhancing their density at a pressure of 20MPa,giving rise to the discharge capacities of the first run and after 30th cycles reached 204mA·h/g and 187mA·h/respectively.

Key words: carbon nanotubes, ternary material, conductive additive

摘要： 以碳纳米管（MWCNTs）代替导电碳黑（SP）添加到镍钴锰（LiNi_1/3Mn_1/3Co_1/3O₂）三元材料，制成正极浆料涂覆于铝箔上并组装成扣式电池。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）进行结构和性能表征，通过恒流放电和电化学阻抗（EIS）检测电池的电化学性能。分别对掺杂了0.5%、1.%、2%、5%、10% MWCNTs的三元材料进行电化学性能检测，结果显示，5% MWCNTs的三元材料在0.1C放电时，首次和第30次循环的放电比容量分别达到179mA·h/g和167mA·h/g；对比含5% SP的三元材料，放电比容量分别提升了9.9%和8.4%，循环稳定性和倍率性能大幅度提高。以20MPa压力对极片进行密实处理，电极的电化学性能进一步改善，首次和30次循环放电容量分别达到204mA·h/g和187mA·h/g。

关键词: 碳纳米管, 三元材料, 导电添加剂

CLC Number:

TM912.9

CHEN Long, SUN Xiaogang, QIU Zhiwen, CAI Manyuan, LIU Zhenhong, WANG Jie, CHEN Wei, LI Xu. Enhancement of electrochemical performance of ternary material by using carbon nanotube as conductive additive[J]. Chemical Industry and Engineering Progress, 2017, 36(12): 4533-4539.

陈珑, 孙晓刚, 邱治文, 蔡满园, 刘珍红, 王杰, 陈玮, 李旭. 碳纳米管增强三元材料的电化学性能[J]. 化工进展, 2017, 36(12): 4533-4539.

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