塑料膜复合集流体在锂离子电池应用中的挑战与改进措施OA北大核心CSTPCD

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.