All-solid battery firing pressure optimization
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Solution Overview
Problem
Existing methods for manufacturing all-solid batteries using solid electrolytes and electrodes require high pressures, leading to expensive and extensive production facilities, and fail to effectively reduce internal resistance and increase energy density.
Innovation Solution
A method involving the preparation of green sheets for electrode and solid electrolyte layers, forming a stacked body, and firing it within a pressure range of 0.01 to 100 kg/cm2, preferably 0.1 to 50 kg/cm2, to achieve low internal resistance and high energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high pressure (180 MPa or 500 kg/cm2) is applied during firing to manufacture all-solid batteries, then the battery structure is formed, but the production facility becomes extremely extensive and expensive
Solution Approach 1:
The patent changes the pressure parameter from conventional high pressure (180 MPa or 500 kg/cm2) to a significantly lower range (0.01 to 100 kg/cm2, preferably 0.1 to 50 kg/cm2). This parameter change enables the formation of battery structure while avoiding the need for extensive and expensive high-pressure production facilities, directly resolving the technical contradiction between manufacturing precision and device complexity.
2Manufacturing precision
If high pressure is applied during firing, then the compact is densified, but the internal resistance of the battery increases and energy density decreases
Solution Approach 1:
The patent optimizes the pressure parameter to a specific low range (0.01 to 100 kg/cm2, preferably 0.1 to 50 kg/cm2) that achieves sufficient compact densification while preventing excessive pressure-induced structural disorder. This optimized parameter range reduces internal resistance and improves energy density, resolving the contradiction between manufacturing precision and reliability.
3Strength
If conventional high pressure firing is used, then the solid electrolyte and electrodes are bonded, but excessive porosity and structural disorder occur
Solution Approach 1:
The patent applies a controlled low pressure (0.01 to 100 kg/cm2, preferably 0.1 to 50 kg/cm2) during firing that provides sufficient bonding between solid electrolyte and electrode layers while preventing excessive porosity and structural disorder. This controlled pressure parameter ensures both strength and compositional stability, resolving the technical contradiction.
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 method reduces internal resistance and increases energy density by ensuring close joining of electrode and electrolyte layers, preventing excessive porosity and structural disorder, while avoiding the need for expensive production facilities.
Implementation Method 1
firing a stacked body while a pressure of 0.01 kg/cm2 or more and 100 kg/cm2 or less is applied
Implementation Method 2
a pressure of 0.01 kg/cm2 or more and 100 kg/cm2 or less is applied in the stacking direction of the stacked body
Data Source
AI summary
A method for manufacturing an all-solid battery that includes: preparing a first green sheet as a green sheet for at least any one of a positive electrode layer and a negative electrode layer; preparing a second green sheet as a green sheet for a solid electrolyte layer; forming a stacked body by stacking the first green sheet and the second green sheet; and firing the stacked body while a pressure of 0.01 kg/cm2 or more and 100 kg/cm2 or less is applied in the stacking direction of the stacked body.