All-Solid-State Battery Activation With Fluid-Mediated Pressure
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Solution Overview
Problem
Existing methods for manufacturing all-solid-state batteries fail to apply uniform pressure during activation, leading to interface contact defects and reduced lifespan due to gas generation, which can cause swelling and performance deterioration.
Innovation Solution
A method involving coupling electrodes and a solid electrolyte to form an all-solid-state battery, placing it in a jig, inserting a fluid between the battery and the jig, fixing it, and charging/discharging to apply uniform pressure, using a sealed pouch to maintain pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform pressure is applied to the battery during activation, then interface contact is improved and lifespan is extended, but the battery may swell due to gas generation
Solution Approach 1:
A fluid is introduced as an intermediary substance between the battery and the jig. The fluid transmits pressure uniformly to the battery surface while accommodating volume changes, preventing both interface separation and battery swelling during activation
Solution Approach 2:
The physical state of the pressing medium is changed from solid (direct mechanical pressure) to fluid (liquid or gas). This parameter change allows the medium to adapt to battery volume changes while maintaining uniform pressure distribution across the battery surface
2Object-generated harmful factors
If chemical methods are used to remove gas, then gas generation is reduced, but chemical reactions in the battery are disturbed
Solution Approach 1:
Chemical methods for gas removal are replaced with a mechanical approach. A fluid-mediated pressing system physically manages gas generation during activation without introducing chemical substances that could interfere with battery reactions
3Ease of manufacture
If natural pressure difference method is used to remove gas, then no additional materials are needed, but gas is not sufficiently removed
Solution Approach 1:
The natural pressure difference method is enhanced by introducing a fluid system. The fluid acts as a transmitting medium that amplifies and distributes pressure uniformly across the battery, significantly improving gas removal efficiency while maintaining process simplicity
4Object-generated harmful factors
If direct mechanical pressure is applied to the battery, then gas removal is improved, but pressure distribution is non-uniform due to surface irregularities
Solution Approach 1:
Direct mechanical pressure application is replaced with fluid-mediated pressure transmission. The fluid ensures homogeneous pressure distribution across the entire battery surface, eliminating the non-uniformity caused by surface irregularities and improving both gas removal and interface contact
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
Uniform pressure application during activation enhances battery performance and extends lifespan by preventing interface separation and swelling, improving capacity retention.
Implementation Method 1
placing a fluid between at least one surface of the all-solid-state battery and the jig... Uniform pressure application during activation enhances battery performance
Implementation Method 2
coupling a positive electrode, a negative electrode, and a solid electrolyte to manufacture an all-solid-state battery
Data Source
AI summary
A method of applying uniform pressure to an all-solid-state battery during activation of the battery and preventing an interface contact surface from being separated as the result of gas generated in the all-solid-state battery is provided. This method increases the lifespan of the battery and an all-solid-state battery manufactured using the same method.