Elastic Sheet Composition for Uniform Pressure in Solid-State Batteries
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Solution Overview
Problem
Existing all solid-state batteries face challenges in uniformly transferring pressure to electrode assemblies and relieving stress, which can lead to inefficiencies and safety concerns during charging and discharging.
Innovation Solution
An elastic sheet is introduced, comprising a spherical polymer with a sphericity of 0.6 to 0.95 and a binder, which is applied outside at least one of the positive or negative electrodes. This elastic sheet is formed by mixing the spherical polymer and binder in a solvent, coating the mixture on a substrate, and photopolymerizing or thermopolymerizing it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid electrolyte is used in an all solid-state battery, then structural strength and safety are improved, but uniform pressure transfer and stress relief become problematic
Solution Approach 1:
The patent introduces an elastic sheet as a flexible component between the solid electrolyte and electrodes. This thin film structure provides the necessary compliance to enable uniform pressure transfer while maintaining the overall structural strength provided by the solid electrolyte. The elastic sheet acts as a mediator that reconciles the rigidity of solid components with the need for flexible pressure distribution.
Solution Approach 2:
The patent creates a composite structure combining the solid electrolyte with an elastic sheet material. This composite approach allows the system to benefit from both the structural strength of the solid electrolyte and the pressure-distributing properties of the elastic material, resolving the contradiction between strength and pressure transfer uniformity.
2Reliability
If rigid solid components are used in the battery, then safety against electrolyte leakage is improved, but stress accumulation during charging and discharging increases
Solution Approach 1:
The elastic sheet is positioned in advance between the solid electrolyte and electrodes to provide cushioning during charging and discharging cycles. This pre-positioned flexible layer absorbs and redistributes stress before it can accumulate in the rigid solid components, preventing stress-related failures while maintaining safety.
Solution Approach 2:
The elastic sheet serves as a flexible intermediary layer that prevents stress accumulation by deforming elastically under load. This thin film allows the rigid solid components to maintain their safety benefits while accommodating volume changes and stress during battery operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The elastic sheet effectively transfers pressure uniformly to the electrode assembly, enhances safety by absorbing stress, and improves the cycle-life characteristics of the all solid-state battery.
Implementation Method 1
photopolymerizing the composition
Implementation Method 2
an elastic sheet for an all solid-state battery
Data Source
AI summary
An elastic sheet for an all solid-state battery as well as an all solid-state battery which includes the elastic sheet for an all solid-state battery, wherein the elastic sheet for an all solid-state battery includes a spherical polymer which has a sphericity of about 0.6 to about 0.95 as well as including a binder.