Roll Press Lamination for All-Solid-State Battery Stability
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Solution Overview
Problem
The ultra-high-pressure pressing process in all-solid-state battery manufacturing can cause physical damage and increase production costs, leading to reduced cell performance and processability.
Innovation Solution
A method involving forming and pre-pressing electrode members, layering them, and using a roll press to achieve dimensional stability and performance equivalent to ultra-high-pressure methods without the need for extreme pressure, by adjusting the thickness and folding the laminated body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultra-high-pressure pressing process is applied to improve interfacial adhesive strength and ionic conductivity, then bonding strength between layers is improved, but physical damage to laminated body occurs resulting in short circuit and performance decline
Solution Approach 1:
The patent changes the pressure parameter from ultra-high pressure to moderate pressure range, and introduces temperature as an additional parameter to control the pressing process. By optimizing the combination of pressure and temperature parameters, the method achieves sufficient interfacial bonding without causing physical damage to the laminated body structure.
Solution Approach 2:
The patent performs preliminary pressing on individual electrode members before final assembly into the laminated body. This preliminary action pre-compresses each layer to reduce voids and improve density before the final lamination step, thereby achieving good interfacial contact without requiring ultra-high pressure that could damage the overall structure.
2Strength
If ultra-high-pressure pressing process is applied to improve bonding strength, then adhesive strength between solid electrolyte layer and active material layer is improved, but production costs increase due to equipment requirements and reduced processability
Solution Approach 1:
The patent modifies the pressure parameter from ultra-high to moderate levels, which enables the use of simpler, more cost-effective pressing equipment. This parameter change directly reduces capital equipment costs and operational expenses while maintaining sufficient bonding strength through optimized temperature and pressure combinations.
Solution Approach 2:
The patent employs conventional pressing equipment with moderate pressure capabilities rather than expensive ultra-high-pressure equipment. By using more accessible, cost-effective equipment that can still achieve the required bonding through optimized process parameters, the method significantly reduces manufacturing costs.
3Stability of the object's composition
If ultra-high-pressure pressing process is applied to achieve dimensional stability, then interfacial contact is improved, but processability decreases requiring additional deformation control equipment
Solution Approach 1:
The patent introduces temperature as a controllable parameter alongside moderate pressure to achieve dimensional stability. By optimizing the temperature-pressure combination, the method ensures proper interfacial contact and dimensional stability without requiring complex ultra-high-pressure equipment with multiple deformation control systems.
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
This method ensures dimensional stability and cell performance comparable to traditional methods while reducing production costs and equipment requirements, making it more suitable for mass production.
Implementation Method 1
pressing the laminated body by passing the laminated body between a pair of rollers... applying a pressure so that the pressed laminated body has a thickness of 70 to 80% of a thickness before the pressing
Implementation Method 2
an all-solid-state battery includes a three-layered laminated body of a cathode active material layer bonded to a cathode current collector, an anode active material layer bonded to an anode current collector, and a solid electrolyte layer disposed between the cathode active material layer and the anode active material layer
Data Source
AI summary
An embodiment method of manufacturing an all-solid-state battery includes forming a first electrode member by forming first active material layers on both surfaces of a first current collector, pressing the first electrode member to form a pressed first electrode member, forming a second electrode member by forming second active material layers on both surfaces of a second current collector and forming solid electrolyte layers on the second active material layers, pressing the second electrode member to form a pressed second electrode member, forming a laminated body by layering the pressed first electrode member and the pressed second electrode member, and pressing the laminated body by passing the laminated body between a pair of rollers to form a pressed laminated body.