Composite Separator for Lithium Battery Thermal Stability
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Solution Overview
Problem
Lithium batteries face challenges with polyolefin-based separators, which have insufficient heat resistance and structural stability, leading to potential internal short circuits and thermal runaway, especially in flexible devices that undergo repeated deformation.
Innovation Solution
An electrode-composite separator assembly is developed, integrating a composite separator with a copolymer, inorganic or organic-inorganic particles, and fluorinated or heat-resistant polymers, eliminating the need for a polyolefin-based membrane, thereby enhancing heat resistance and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polyolefin-based separator is used, then the battery structure is simple and easy to manufacture, but the heat resistance and structural stability are insufficient
Solution Approach 1:
The separator is constructed as a composite material consisting of a polyolefin base layer combined with a heat-resistant polymer coating layer containing inorganic particles. This composite structure provides both the manufacturing simplicity of polyolefin and the heat resistance of the coating layer, resolving the contradiction between ease of manufacture and heat resistance.
2Ease of manufacture
If a polyolefin-based separator is used, then the manufacturing process is simple, but the structural stability against repeated deformation is insufficient
Solution Approach 1:
The composite separator structure with inorganic particles embedded in a heat-resistant polymer coating provides enhanced structural stability while maintaining the simplicity of polyolefin manufacturing processes. The inorganic reinforcement layer prevents deformation during battery assembly and operation.
3Temperature
If the separator heat resistance is improved by adding coatings or layers, then the thermal stability is enhanced, but the device complexity increases
Solution Approach 1:
The separator is divided into distinct functional layers: a polyolefin base layer providing mechanical integrity and a separate heat-resistant coating layer with inorganic particles providing thermal stability. This segmentation allows each layer to perform its specific function optimally while keeping the overall structure manageable and manufacturable.
Data Source
AI summary
An electrode-composite separator assembly for a lithium battery includes: an electrode; and a composite separator, wherein the composite separator includes: a copolymer including a first repeating unit represented by Formula 1, a second repeating unit represented by Formula 2, and a third repeating unit represented by Formula 3; at least one selected from an inorganic particle and an organic-inorganic particle; and at least one polymer selected from a fluorinated polymer and a heat-resistant polymer, wherein Formulas 1-3 areAlso a lithium battery including the electrode composite separator assembly.