储能科学与技术

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硬碳的预锂化及其电化学性能研究

张贵锋1, 赵清江2   

  1. 1.河南锂动电源有限公司，河南 新乡 453006
    2.新乡职业技术学院，河南 新乡 453006
  • 收稿日期:2021-02-23 修回日期:2021-04-13

Research on the prelithiation of hard carbon and its electrochemical performance

Guifeng ZHANG1, Qing-jiang ZHAO2   

  1. 1.Henan Lithium Power Co. , Ltd. , XinXiang 453006, Henan, China
    2.Xinxiang Vocational and Technical College, XinXiang 453006, Henan, China
  • Received:2021-02-23 Revised:2021-04-13

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摘要：

以钴酸锂@活性碳复合材料作为正极，以商业化硬碳为负极同时将其与锂粉进行不同比例的复合，然后通过涂布、辊压和卷绕等一系列步骤制备得到了钴酸锂@活性碳/预嵌锂硬碳锂离子电容器（LIC）。本论文通过对硬碳与锂粉进行不同比例的复合制备得到了多种预嵌锂硬碳极片，然后，通过对所制备得到的预嵌锂硬碳极片组装的LIC进行了一系列电化学性能测试，研究了硬碳极片的嵌锂量对LIC比能量和比功率的影响。结果表明：将硬碳与锂粉进行复合可以在不明显减小LIC比功率的同时，大幅提升LIC的比能量，其中当硬碳与锂粉的质量比为3：1时所组装的LIC其能量密度达到46.06 Wh/kg，功率密度可以达到6.5 kW/kg，在电流密度为5 A/g时充放电循环2000次后容量保持率能够达到82.13 %。

关键词: 预嵌锂, 锂离子电容器, 比功率, 比能量

Abstract:

Lithium cobalt oxide @activated carbon composite material was used as the positive electrode, and the commercial hard carbon was used as the negative electrode. The cobalt was prepared by a series of steps such as coating, rolling and winding. Lithium cobalt oxide @activated carbon/pre-inserted lithium hard carbon lithium ion capacitor (LIC). In this thesis, a variety of pre-inserted lithium hard carbon pole pieces were prepared by pre-intercalating hard carbon with different contents of lithium. Then, a series of electroporation was performed on the LIC assembled with the prepared pre-inserted lithium hard carbon pole pieces. The chemical performance test studied the influence of the amount of lithium insertion of the hard carbon pole piece on the specific energy and specific power of LIC. The results showed that doping lithium powder in hard carbon can greatly increase the specific energy of LIC without significantly reducing the specific power of LIC. Among them, the assembled LIC when the mass ratio of hard carbon to lithium powder was 3:1 The energy density can reach 46.06 Wh/kg, the power density can reach 6.5 kW/kg, and the capacity retention rate can reach 82.13% after 2000 cycles of charge and discharge at a current density of 5 A/g.

Key words: Pre-embedded lithium, lithium ion capacitor, specific power, specific energy