Composite Battery Substrate With Conductive Layers for Low Resistance
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in achieving high energy density and low interfacial resistance, as well as improved adhesion of the active material to the substrate.
Innovation Solution
A composite substrate for rechargeable lithium batteries is developed, comprising a support layer with a polymer resin matrix and conductive materials, along with a metal layer and a functional layer that includes metal carbide oxide, enhancing electrical conductivity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional substrate is used, then the structure is simple, but the energy density and electrical conductivity are insufficient
Solution Approach 1:
The substrate is constructed as a composite material system comprising a polymer resin matrix integrated with multiple conductive materials (such as carbon nanotubes, metal fibers, or conductive polymers). This composite structure simultaneously enhances electrical conductivity and energy density while maintaining structural integrity, resolving the contradiction between performance improvement and structural complexity.
Solution Approach 2:
Conductive materials are selectively distributed within the polymer resin matrix at specific locations and concentrations to optimize electrical conductivity pathways. This localized enhancement approach improves overall substrate performance without uniformly increasing complexity throughout the entire structure, allowing targeted improvement of energy density and conductivity where most needed.
2Reliability
If the substrate lacks conductive materials, then the structure is simple, but the interfacial resistance is high
Solution Approach 1:
The integration of conductive materials within the polymer resin matrix creates a composite substrate that reduces interfacial resistance by establishing continuous conductive pathways between electrode and current collector. The composite structure ensures reliable electrical contact while managing the added compositional complexity through systematic material selection and distribution.
3Strength
If the substrate lacks adhesive functional layers, then the structure is simple, but the adhesion of active material is poor
Solution Approach 1:
The polymer resin matrix itself serves as an adhesive functional layer, providing bonding strength between the active material and current collector. The composite nature of the substrate, combining polymer resin with conductive materials, delivers both adhesion and electrical conductivity functions, reducing the need for separate adhesive layers while managing structural complexity.
Data Source
AI summary
Example embodiments include a composite substrate for a rechargeable lithium battery, and a rechargeable lithium battery including the composite substrate. Example embodiments include a composite substrate for a rechargeable lithium battery that includes a support layer containing a polymer resin matrix and two or more conductive materials, and a metal layer on at least one surface of the support layer, wherein the two or more conductive materials include two or more materials including at least one of a conductive metal, a conductive polymer, a conductive oxide, a fibrous material (FIB), and a carbon nanotube (CNT).