Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (10): 3388-3399.doi: 10.19799/j.cnki.2095-4239.2024.0669

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Challenges and improvement measures of plastic film composite current collectors for lithium-ion batteries

Xianfeng DONG1(), Zhiguo ZHANG1(), Huaqing LI2, Li WANG1, Xiangming HE1   

  1. 1.Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
    2.Jiangsu HanYe New Material Institute Co. , Ltd, Suzhou 215234, Jiangsu, China
  • Received:2024-07-18 Online:2024-10-28 Published:2024-10-30
  • Contact: Zhiguo ZHANG E-mail:dxf24@mails.tsinghua.edu.cn;zhangzhiguohit@gmail.com

Abstract:

A plastic film composite current collector (PFCC) is a new battery collector with a sandwich-like structure made of a two metal layer, plastic polymer, and another metal layer. IPFCCs have attracted research attention because they can improve the energy density and safety of lithium-ion batteries (LIBs). However, PFCCs have several disadvantages in the application of LIBs, which limits their industrialization process. This paper summarizes the their disadvantages, including weak polymer-metal adhesion, poor electrical conductivity, and poor corrosion resistance, Furthermore, the study discusses the related mechanisms of their disadvantages, including the weak physical and chemical forces of the interface bonding between polymer and metal layers; shortcomings of the polymers, such as their own insulating properties, the vulnerability of PET to catalytic depolymerization, and poor thermal stability; and the poor bonding force at the polymer-metal interface during electrolyte immersion and cold press processing. This paper systematically summarizes the development history of PFCCs in the LIB application technology, and simultaneously explains how they can be improved through interface engineering, material regulation, processing technology and equipment optimization, and other methods and measures, such as setting up a real-time welding-quality monitoring system, establishing a multifunctional interfacial reinforcement layer, and designing a functional structure inside and outside of the collector to lay the theoretical foundation for PFCC development and to promote the development of PFCCs in LIBs.

Key words: lithium-ion battery, composite current collector, metal coating, plastic film, interface problem

CLC Number: