储能科学与技术 ›› 2019, Vol. 8 ›› Issue (4): 718-724.doi: 10.12028/j.issn.2095-4239.2019.0009

• 研究开发 • 上一篇    下一篇

聚合物基PTC导电材料的制备及其在锂离子电池中的应用

何浩, 潘俊安, 雷维新, 潘勇, 胡佳卿, 廖盎   

  1. 湘潭大学材料科学与工程学院, 湖南 湘潭 411100
  • 收稿日期:2019-01-24 修回日期:2019-03-15 出版日期:2019-07-01 发布日期:2019-03-22
  • 通讯作者: 潘勇,教授,主要研究方向为新型能源材料,E-mail:ypan@xtu.edu.cn。
  • 作者简介:何浩(1994-),男,硕士研究生,主要研究方向为锂离子电池阻燃材料,E-mail:hehao547@163.com
  • 基金资助:
    国家自然科学基金项目(11372267)。

Preparation of conductive fire retardant and its application in Li-ion battery

HE Hao, PAN Junan, LEI Weixin, PAN Yong, HU Jiaqing, LIAO Ang   

  1. College of Material Science and Engineering, Xiangtan University, Xiangtan 411100, Hunan, China
  • Received:2019-01-24 Revised:2019-03-15 Online:2019-07-01 Published:2019-03-22

摘要: 锂离子电池内短路是诱发电池热失控的主要原因,适当的安全性添加剂可以阻止电池热失控的发生。本文通过界面聚合法在聚乙烯蜡表面生成适量的导电聚苯胺,制备了一种具有良好导电性能的PTC材料(PANI-PEW),并对PANI-PEW的微观形貌、电导率以及添加至LiFePO4正极中的电化学性能进行了对比分析。测试结果表明,PANI-PEW在常温下的电导率为1.08×10-3 S/m,在90~120℃时,其电阻值急剧增大。在0.5 C和1 C倍率下,PANI-PEW的加入对LiFePO4电池的阻抗和循环性能影响较小,而经过120℃热处理后的含15%(质量分数) PANI-PEW的极片,其电池的阻抗大幅增加且首次放电比容量只有35.3 mA·h/g,在第12次循环后,放电比容量接近于0。以上结果表明,PANI-PEW是一种性能优异的PTC材料且能在120℃时阻止电池热失控的发生。

关键词: 安全性, 聚苯胺, 聚乙烯蜡, 热失控, 界面聚合

Abstract: Short circuit in lithium ion battery is the main cause of thermal runaway, the proper safety additives can prevent the thermal runaway. A positive temperature coeffcient material (PANI-PEW) was prepared by polymering amount of PANI particles on the surface of PEW. The morphology and conductivity of PANI-PEW, the electrochemical performance of LiFePO4 batteries with PANI-PEW were tested at room temperature and 120℃. The results showed as follow:the conductivity of PANIPEW was 1.08×10-3 S/m at room temperature and its resistant increased rapidly during 90~120℃. It had little effect on the impedance and cycling performance when PANI-PEW introduced into LiFePO4 battery at 0.5 C and 1 C. But the impedance of LiFePO4 battery with 15% PANI-PEW increased rapidly and the frst specifc capacity only was 35.3mA·h/g after the LiFePO4 electrode with 15% PANI-PEW was treated at 120℃ for 1 min, even after the 12th cycle, the specifc capacity closed to 0. This study indicate that the PANI-PEW is an excellent PTC composite and improved the safety performance of LiFePO4 battery at 120℃.

Key words: safety, polyaniline, polyethylene wax, thermal runaway, interfacial polymerization

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