Hybrid Polymer-Ceramic Battery Separators for Safety
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Solution Overview
Problem
Lithium ion batteries face safety concerns due to design flaws leading to fires and explosions, and capacity improvements have not kept pace with demand, often compromising safety for increased capacity.
Innovation Solution
Development of advanced separators with improved mechanical, thermal, and safety performance characteristics, including porous membranes and fiber mats composed of polymer-ceramic hybrid materials, which are thinner and more efficient, reducing the risk of short circuits and enhancing charging rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the separator is made thinner to increase active material loading, then battery capacity increases, but the reliability and safety of the separator deteriorate due to higher likelihood of breakdown, thickness variation, and damage
Solution Approach 1:
The patent applies composite materials by combining polymer and ceramic materials to create a hybrid separator. The ceramic component (such as alumina) provides enhanced mechanical strength and thermal stability, allowing the separator to be made thinner without compromising reliability. This composite structure resolves the contradiction by enabling thin design for higher capacity while maintaining safety through the reinforcing ceramic phase.
Solution Approach 2:
The patent changes the physical and chemical parameters of the separator material by incorporating ceramic particles into the polymer matrix. This modification alters the mechanical properties, thermal behavior, and structural integrity of the separator, enabling it to maintain high reliability at reduced thickness. The parameter changes in material composition directly address the contradiction between thinness and reliability.
2Quantity of substance
If aggressive design decisions are made to improve capacity, then battery capacity increases, but safety deteriorates due to design flaws and increased failure likelihood
Solution Approach 1:
The ceramic-polymer composite separator provides inherent safety improvements through the ceramic component's high thermal stability and flame resistance. This composite structure prevents the safety hazards associated with aggressive thin designs by providing a inherently safer material system that maintains integrity under thermal stress and mechanical loading, thereby reducing fire and explosion risks.
Solution Approach 2:
The ceramic reinforcement in the hybrid separator acts as a preventive measure against potential failures. By incorporating the ceramic phase beforehand, the separator is pre-strengthened to resist breakdown, thickness variation, and damage that could lead to safety incidents. This prior cushioning through material design prevents safety hazards before they can occur.
3Quantity of substance
If the separator thickness is reduced, then the amount of non-active material decreases and capacity increases, but mechanical strength and thermal stability deteriorate
Solution Approach 1:
The patent uses composite materials where ceramic particles (such as alumina) are dispersed in or coated on the polymer matrix. The ceramic phase provides mechanical reinforcement and thermal stability, compensating for the reduced thickness. This allows the separator to be thinner (increasing active material loading) while the ceramic component maintains the necessary mechanical strength and thermal resistance.
Solution Approach 2:
The ceramic reinforcement can be applied locally or selectively within the separator structure, such as through coating or targeted distribution. This local quality enhancement provides strength and thermal stability where most needed, allowing thin overall design while maintaining critical mechanical properties in key areas to support higher active material loading.
Data Source
AI summary
Provided herein are a variety of porous separator materials, particularly those prepared by gas-assisted electrospray and electrospinning processes.