中国塑料 ›› 2024, Vol. 38 ›› Issue (12): 24-28.DOI: 10.19491/j.issn.1001-9278.2024.12.004

• 材料与性能 • 上一篇    下一篇

锂电池湿法隔膜用超高分子量聚乙烯的降解动力学研究

宋瑞铭1(), 吕怀兴1,2, 张文龙1,3, 李斌1(), 李慧1()   

  1. 1.东华大学材料科学与工程学院,纤维材料改性国家重点实验室,先进低维材料中心,上海 201620
    2.江西格林循环产业股份有限公司,江西 宜春 331100
    3.朴烯晶新能源材料(上海)有限公司,上海 200233
  • 收稿日期:2024-04-30 出版日期:2024-12-26 发布日期:2024-12-25
  • 通讯作者: 李斌(1981-),男,研究员,主要从事碳计算,高分子加工,高端聚烯烃材料等研究,bli@dhu.edu.cn
    李慧(1973-),女,研究员,主要从事高分子加工,复合材料改性等研究,lihui@dhu.edu.cn
    E-mail:17852325351@163.com;bli@dhu.edu.cn;lihui@dhu.edu.cn
  • 作者简介:宋瑞铭(1999-),男,硕士研究生,主要从事高分子加工研究,17852325351@163.com

Degradation kinetics of ultra⁃high molecular⁃weight polyethylene for wet⁃process separator of lithium⁃ion battery

SONG Ruiming1(), LYU Huaixing1,2, ZHANG Wenlong1,3, LI Bin1(), LI Hui1()   

  1. 1.School of Material Science & Engineering,State Key Laboratory of Chemical Fibers and Polymer Materials,Center of Advanced Low Dimension Materials,Shanghai 201620,China
    2.Jiangxi Green Recycling Co,Limited,Yichun 331100,China
    3.Puxijing New Energy Material (Shanghai) Co,Limited,Shanghai 200233,China
  • Received:2024-04-30 Online:2024-12-26 Published:2024-12-25
  • Contact: LI Bin, LI Hui E-mail:17852325351@163.com;bli@dhu.edu.cn;lihui@dhu.edu.cn

摘要:

研究了不同温度、不同矿物油含量和剪切力作用等条件下锂电池湿法隔膜用超高分子量聚乙烯(PE⁃UHMW)的降解动力学,并对降解速率曲线进行拟合,得到符合其降解行为的动力学模型:PE⁃UHMW在温度和加入矿物油的条件下降解动力学符合准一级动力学模型;在剪切力作用时PE⁃UHMW降解动力学符合准二级动力学模型;随着温度升高和剪切力作用会使PE⁃UHMW的降解速率增大,矿物油的加入会使PE⁃UHMW的降解速率减小。

关键词: 锂电池湿法隔膜, 超高分子量聚乙烯, 降解动力学

Abstract:

The paper reported an investigation on the degradation kinetics of ultra⁃high molecular⁃weight polyethylene (PE⁃UHMW) used for wet⁃process separator of lithium⁃ion battery under different conditions such as temperature, synthetic oil concentration, and shear force. A degradation rate curve was fitted to obtain a kinetic model suitable for the degradation behavior of PE⁃UHMW. The degradation kinetics of PE⁃UHMW at various temperatures and white oil concentrations was consistent with the first⁃order kinetic model; however, its degradation kinetics under a shear stress conformed to the second⁃order kinetic model. The degradation rate of PE⁃UHMW increased with an increase in the temperature and shear force; however, its degradation rate was reduced by the addition of white oil.

Key words: lithium battery wet?process separator, ultra?high molecular weight polyethylene, degradation kinetics model

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