储能科学与技术 ›› 2016, Vol. 5 ›› Issue (6): 834-840.doi: 10.12028/j.issn.2095-4239.2016.0019

• 研究开发 • 上一篇    下一篇

中间相炭微球负极预嵌锂量对软包装锂离子电容器性能的影响

张世佳,张  熊,孙现众,赵菲菲,贾俊翔,马衍伟   

  1. 中国科学院电工研究所,北京 100190
  • 收稿日期:2016-03-08 修回日期:2016-03-23 出版日期:2016-11-01 发布日期:2016-11-01
  • 通讯作者: 张熊,研究员,研究方向为超级电容器储能技术,E-mail:zhangxiong@mail.iee.ac.cn。
  • 作者简介:张世佳(1991—),男,硕士研究生,研究方向为锂离子电容器,E-mail:zhangshijia@mail.iee.ac.cn
  • 基金资助:
    国家自然科学基金项目(51472238,51307167)

Effect of the pre-lithiation capacity of mesocarbon microbeads anode on the performances of a flexible packaging lithium ion capacitors#br#

ZHANG Shijia, ZHANG Xiong, SUN Xianzhong, ZHAO Feifei, JIA Junxiang, MA Yanwei   

  1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2016-03-08 Revised:2016-03-23 Online:2016-11-01 Published:2016-11-01

摘要: 以活性炭作为正极,预嵌锂的中间相炭微球为负极,制成软包装锂离子电容器。在正负极活性材料质量比为1∶1的条件下,采用恒压嵌锂法对负极进行预嵌锂,嵌锂容量分别为100 mA•h/g、200 mA•h/g、300 mA•h/g。在2~4 V的电压区间内,对软包装器件进行倍率测试及高倍率下的寿命测试。测试结果显示,锂离子电容器单体电容量为4~5 F,预嵌锂容量为200 mA•h/g时电容器展现出最佳的电化学性能,首次充放电能量密度为83.7 W•h/kg(基于正负极活性质量),在倍率为120 C时,功率密度达8835.4 W/kg,能量密度保持在40.3 W•h/kg。在20 C的倍率下进行充放电寿命测试,500次循环之后,能量密度保持91.6%,1000次循环之后,能量密度保持86.5%。

关键词: 锂离子电容器, 软包装, 活性炭, 中间相炭微球, 负极预嵌锂

Abstract: Lithium ion capacitors (LIC) are fabricated in flexible packaging using activated carbon (AC) cathode and mesocarbon microbeads (MCMB) anode with mass ratio of 1∶1. We use constant-voltage pre-lithiation method and the capacity are 100 mA•h/g, 200 mA•h/g, and 300 mA•h/g, respectively. Rate capability and cycle life at high C-rates are evaluated at the potential range of 2.0—4.0 V. The results reveal that the capacitance of LIC monomer is between 4—5 F and the optimal electrochemical performance is obtained in the LIC with pre-lithiation capacity of 200 mA•h/g1. The first charge-discharge energy density is 83.7 W•h/kg (based on active material mass of two electrodes), the power density is 8835.4 W/kg and the energy density is 40.3 W•h/kg at 120 C rate. The cycle performance is tested at 20 C rate, the energy density retention is 91.5% after 500 cycles and 86.5% after 1000 cycles.

Key words: lithium ion capacitor, flexible package, activated carbon, mesocarbon microbead, pre-lithiation