Composite Battery Substrate Structure for Shape-Stable Fabrication
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in maintaining structural integrity and safety during the battery fabrication process, leading to potential deformation and elongation issues.
Innovation Solution
A composite substrate for lithium batteries is designed with a support layer and metal layers on either surface, utilizing polymers with varying tensile strengths and elongations to enhance structural stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single polymer material is used for the support layer, then the fabrication process is simple, but the battery undergoes deformation and elongation during fabrication
Solution Approach 1:
The support layer is constructed as a composite material comprising first and second polymers with different tensile strengths and elongation properties. This composite structure prevents battery deformation during fabrication by combining materials with complementary mechanical properties, resolving the contradiction between manufacturing simplicity and shape stability.
Solution Approach 2:
The support layer is segmented into multiple polymer components with distinct functional roles. The first polymer provides baseline structural support while the second polymer with higher tensile strength and lower elongation specifically prevents deformation during fabrication. This segmentation allows each component to optimize its function without compromising the other.
2Strength
If polymers with high tensile strength are used, then deformation is reduced, but the elongation capability decreases
Solution Approach 1:
Different regions of the support layer have different polymer compositions tailored to local requirements. The composite structure distributes polymers with high tensile strength and low elongation in specific configurations that provide reinforcement where needed, while maintaining overall elongation capability through the complementary first polymer matrix.
Data Source
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AI summary
Disclosed are composite substrates, and rechargeable lithium batteries including the composite substrates. A composite substrate includes a support layer, a first metal layer on a top surface of the support layer, and a second metal layer on a bottom surface of the support layer. The support layer includes a first polymer and a second polymer that are different from each other. A tensile strength of the second polymer is greater than a tensile strength of the first polymer. An elongation of the first polymer is greater than an elongation of the second polymer.