储能科学与技术 ›› 2021, Vol. 10 ›› Issue (3): 1025-1031.doi: 10.19799/j.cnki.2095-4239.2020.0424

• 储能材料与器件 • 上一篇    下一篇

凝胶型锂离子电池的制作及电化学和安全性能

涂健1(), 徐雄文1, 胡海波1, 聂阳1, 曾涛1, 孙秋实2, 成浩2, 谢健2(), 赵新兵2   

  1. 1.湖南立方新能源科技有限责任公司,湖南 株洲 412000
    2.浙江大学材料科学与工程学院,浙江 杭州 310027
  • 收稿日期:2020-12-31 修回日期:2021-01-22 出版日期:2021-05-05 发布日期:2021-04-30
  • 通讯作者: 谢健 E-mail:kenttu@lifuntech.com;xiejian1977@zju.edu.cn
  • 作者简介:涂健(1976—),男,博士,高级工程师,研究方向为锂离子电池,E-mail:kenttu@lifuntech.com
  • 基金资助:
    湖南省重大科技项目(2020GK1014);国家自然科学基金项目(51572238);浙江省自然科学基金(LY19E020013)

Fabrication of gel-type Li-ion batteries and their electrochemical and safety properties

Jian TU1(), Xiongwen XU1, Haibo HU1, Yang NIE1, Tao ZENG1, Qiushi SUN2, Hao CHENG2, Jian XIE2(), Xinbing ZHAO2   

  1. 1.Hunan Cube New Energy Technology Co. Ltd. , Zhuzhou 412000, Hunan, China
    2.School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2020-12-31 Revised:2021-01-22 Online:2021-05-05 Published:2021-04-30
  • Contact: Jian XIE E-mail:kenttu@lifuntech.com;xiejian1977@zju.edu.cn

摘要:

采用原位聚合法制备了凝胶型软包锂离子电池,该电池包括钴酸锂正极、石墨负极、镀陶瓷聚乙烯隔膜,以及弥散于正负极和隔膜之间的凝胶电解质。电化学测试表明,凝胶型电池具有和液态电池可比的容量和循环稳定性。差示扫描量热(DSC)测试表明,相对于液态电解质,凝胶电解质与钴酸锂正极和石墨负极之间的热稳定性更好。热板和加速量热(ARC)试验表明,凝胶电池具有更好的安全性能。采用原位聚合法制作了超薄软包电池,该电池显示出较好的柔性,经折叠和剪切试验后该电池仍可正常工作。

关键词: 锂二次电池, 凝胶电解质, 聚季戊四醇三丙烯酸酯, 原位聚合, 钴酸锂

Abstract:

Pouch-type gel Li-ion batteries were fabricated by in-situ polymerization and constructed from a LiCoO2 cathode, a graphite anode, a ceramics-coated polyethylene separator, and a gel electrolyte that was dispersed in between. Electrochemical tests showed that the battery using the gel electrolyte exhibited comparable capacity and cycling stability compared with that using the liquid electrolyte. The differential scanning calorimeter tests indicated that the gel electrolyte exhibited an improved thermal stability toward LiCoO2 and graphite than the liquid electrolyte. The hot-plate and accelerating rate calorimetry tests suggested that the safety property of the battery can be enhanced using gel electrolytes instead of liquid electrolytes. An ultrathin pouch battery was also fabricated by in-situ polymerization, and it showed good flexibility and can still operate after folding and cutting.

Key words: lithium secondary batteries, gel electrolytes, poly(pentaerythritol triacrylate), in-situ polymerization, LiCoO2

中图分类号: