储能科学与技术 ›› 2018, Vol. 7 ›› Issue (2): 270-275.doi: 10.12028/j.issn.2095-4239.2017.0176

• 研究开发 • 上一篇    下一篇

以高富锂Li2NiO2/活性炭为正极的锂离子电容器电化学性能研究

杨  斌1,2，傅冠生2，丁  升2，王成扬1，阮殿波2，刘秋香2   

  1. 1天津大学化工学院，天津 300072；2宁波中车新能源科技有限公司超级电容研究所，浙江 宁波 315112
  • 收稿日期:2017-12-08 修回日期:2017-12-22 出版日期:2018-03-01 发布日期:2018-03-01
  • 通讯作者: 王成扬，教授，博士生导师，E-mail：cywang@tju.edu.cn。
  • 作者简介:杨斌（1987—），男，博士研究生，从事超级电容器电极材料、器件制备与工艺技术研究，E-mail：byang@crrccap.com
  • 基金资助:
    宁波市重大科技专项，（201601ZD-A01018）。

Electrochemical performance of lithium ion capacitors using high-capacitance Li2NiO2/AC as the negative electrode

YANG Bin1,2, FU Guansheng2, DING Sheng2, WANG Chengyang1, RUAN Dianbo2, LIU Qiuxiang2   

  1. 1 School of Chemical Engineering＆Technology, Tianjin University, Tianjin 300072, China;2 Institute of Supercapacitor, Ningbo CRRC New Energy Technology Co. Ltd, Ningbo 315112, Zhejiang, China
  • Received:2017-12-08 Revised:2017-12-22 Online:2018-03-01 Published:2018-03-01

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摘要： 兼具锂离子电池高能量密度和双电层电容器高功率特性的锂离子电容器成为了现今超级电容器性能提升的重点发展方向。本工作以高富锂金属氧化物Li2NiO2为锂离子电容器用负极锂源，将其与活性物复合组成正极电极，并制备出“无金属锂片”预嵌锂过程的300 F锂离子电容器，考察了金属氧化物Li2NiO2的理化性能与电化学特性、不同Li2NiO2添加量对锂离子电容器样品的电化学性能影响。结果表明，Li2NiO2材料具有398 mA·h/g的首次不可逆容量，首次放电不可逆率为94.8%。添加15%～20% Li2NiO2的样品在10 A电流下具有大于75%倍率特性以及91%的容量保持率。当Li2NiO2添加量为20%时，样品在1 A条件下具有400 F的容量，15.5 W·h/kg的能量密度以及11.3 kW/kg的功率密度，是一种制备工艺简单、性能优异的新型锂离子电容器。

关键词: 锂离子电容器, 高富锂金属氧化物, 活性炭, 嵌锂量

Abstract:

Combining the advantages of Lithium ion battery’s high energy density and electric double layer capacitor’s excellent power performance, Lithium ion capacitor has been regarded as one of the most important research area for supercapacitors. Using high capacitance Li2NiO2 as the Li+ resources for negative electrode, composited activated carbon as the positive electrode, a 300 F lithium ion capacitor has been prepared without “lithium foil” during the pre-doping process. The physical and electrochemical performance of Li2NiO2 and the adding amount of Li2NiO2 have been investigated. The results shows that: Li2NiO2 exhibits a distinctively high irreversible capacity of 398 mA·h·g1 with an irreversible capacity ratio of 94.8% during the first cycle. After adding 15%～20% Li2NiO2 for the lithium ion capacitors, it shows more than 75% rate performance at 10A and nearly 91% capacitance retention during the cycle life time. When adding 20% Li2NiO2 at the composite electrode, the cell has nearly 400F capacitance, 15.5W·h·kg1 energy density and 1.3 kW·kg1 power density. Meantime, the simply making process will prompt this kind of lithium ion capacitor to embracing a bright future.

Key words: lithium ion capacitor, high lithium metal oxide materials, activated carbon, pre-doping , amount