Solid-State Battery Elastic Foam Layer for Uniform Pressurization
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Solution Overview
Problem
All-solid-state secondary batteries face issues with stress transfer to the solid electrolyte due to non-uniform pressurization, leading to potential damage and reduced discharge efficiency, especially when the anode thickness increases during charging and discharging.
Innovation Solution
Incorporating an elastic sheet with a foam component in the battery structure, which is foamed after lamination to form a stress relief layer, using a method that includes mixing acrylate monomers with reinforcing particles and foaming agents to create a uniform pressurization and enhance the restoring force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an all-solid-state battery is compressed or pressurized during assembly or operation, then the battery structure is stabilized and components are held in place, but stress is transferred to the solid electrolyte causing damage or short circuits
Solution Approach 1:
The patent introduces an elastic layer as an intermediary component positioned between the external compression source and the solid electrolyte. This elastic layer absorbs and distributes the applied stress, preventing direct stress transfer to the solid electrolyte while still maintaining the battery structure's stability and component positioning.
Solution Approach 2:
The patent employs a foam component within the elastic layer that provides a porous structure. This porous foam material effectively dissipates and distributes applied stress through its cellular structure, reducing peak stress concentrations on the solid electrolyte while maintaining overall compression and structural stability.
2Ease of manufacture
If the battery is not uniformly pressurized during discharging, then assembly is simpler, but lithium ions move to locally pressurized parts lowering discharge efficiency
Solution Approach 1:
The patent creates local quality variations through the foam component's cellular structure and the elastic layer's non-uniform density distribution. This allows different regions to provide different levels of stress distribution, ensuring uniform pressure application to the solid electrolyte while maintaining simple assembly procedures.
3Quantity of substance
If the anode thickness is increased to improve capacity, then energy density is improved, but stress from dendrite generation transfers to the solid electrolyte during charging
Solution Approach 1:
The patent implements beforehand cushioning by positioning the elastic layer with foam component between the anode and solid electrolyte before charging occurs. This pre-positioned cushioning layer absorbs stress generated during charging cycles, particularly from dendrite formation in thick anodes, preventing stress transfer to the solid electrolyte while allowing high capacity 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 layer effectively disperses stress, ensuring uniform pressurization and enhances discharge efficiency by maintaining contact integrity between the anode and solid electrolyte, reducing stress transfer and improving Coulombic efficiency.
Implementation Method 1
an elastic layer which disperses stress applied to the solid electrolyte
Implementation Method 2
applying an elastic sheet including a foam component in an all-solid-state battery laminating operation
Implementation Method 3
a foaming agent and reinforcing particles may be mixed with syrup including an acrylate monomer
Data Source
AI summary
Provided are an all-solid-state secondary battery and a method of manufacturing the all-solid-state secondary battery. According to an aspect of the present disclosure, there is provided a method of manufacturing an all-solid-state secondary battery, the method including forming a unit stack cell structure including a cathode layer, a solid electrolyte layer, an anode layer, and an elastic layer, inserting the unit stack cell structure into a housing, and foaming the elastic layer, wherein, in the forming of the unit stack cell structure, the elastic layer has a pad shape that is not foamed, and in the foaming of the elastic layer, the elastic layer is in the form of a foam.