Composite current collector

By superimposing a functional layer of low-melting-point bonding polymer and conductive carbon elements onto a polymer substrate of a lithium-ion battery, along with a metal layer, and combining advanced fabrication processes, the problem of balancing conductivity and mechanical integrity during the thinning process of the current collector has been solved, resulting in higher power density and cycle stability.

CN122436499APending Publication Date: 2026-07-21GM GLOBAL TECHNOLOGY OPERATIONS LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GM GLOBAL TECHNOLOGY OPERATIONS LLC
Filing Date
2025-01-20
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In the pursuit of thinner current collectors to increase energy density, existing lithium-ion battery current collectors have struggled to balance conductivity and mechanical integrity, leading to decreased conductivity and increased susceptibility to damage.

Method used

A multilayer structure is formed by superimposing a low-melting-point bonding polymer material and a conductive carbon element on a polymer substrate, combined with a metal layer, and preparing a current collector through slurry casting and physical vapor deposition processes. The bonding is then enhanced through a thermal lamination process.

Benefits of technology

It improves the conductivity and bonding strength of the current collector, maintains the mechanical integrity of the thin layer, and enhances the power density and cycle stability of the lithium-ion battery.

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Abstract

A current collector for a lithium ion battery includes a polymer substrate, a first functional material layer on a top surface of the polymer substrate and a second functional material layer on a bottom surface of the polymer substrate, a first metal layer applied to the first functional material layer and a second metal layer applied to the second functional material layer, wherein the first functional material layer is between the first metal layer and the substrate and interconnects the first metal layer and the substrate, and the second functional material layer is between the second metal layer and the polymer substrate and interconnects the second metal layer and the polymer substrate.
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