All-Solid-State Battery Electrode Dry Rolling for Uniform Thickening
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Solution Overview
Problem
Conventional wet methods for manufacturing electrodes for all-solid-state batteries result in non-uniform production and high manufacturing costs, with issues such as swelling of binders and inefficient thickening processes.
Innovation Solution
A dry manufacturing method using first and second rollers with specific size and spacing conditions to compress a mixture of solid electrolyte and active materials, creating a composite sheet with a current collector, which allows for uniform thickness and increased porosity without drying processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet processing method is used to manufacture electrode, then electrode can be formed with binder, but manufacturing cost increases and uniformity decreases
Solution Approach 1:
The invention extracts and removes the binder component from the electrode manufacturing process. By using a dry processing method without binder, the patent eliminates the swelling issue that occurs during drying, thereby achieving uniform electrode thickness while simplifying the manufacturing process.
Solution Approach 2:
Instead of following the conventional wet processing route (mixing slurry with binder, coating, then drying), the invention inverts the approach by using dry processing from the beginning. The electrode materials are directly formed into the desired shape without liquid binder, eliminating the need for drying and preventing uniformity issues.
2Volume of moving object
If wet processing method is used to thicken electrode, then electrode thickness can be increased, but manufacturing cost increases and uniformity deteriorates
Solution Approach 1:
The invention removes the binder from the electrode structure, allowing thickening to be achieved through direct compression of active materials and solid electrolyte without the swelling problems that occur in wet-processed thick electrodes. This enables uniform thick electrodes to be manufactured at lower cost.
3Device complexity
If conventional rolling method is used, then manufacturing process is simple, but electrode thickness and density cannot be precisely controlled
Solution Approach 1:
The rolling process is segmented into multiple stages with different roller configurations. First rolling forms the initial electrode structure, second rolling adjusts thickness, and third rolling controls density. This segmented approach achieves precise thickness and density control while maintaining relatively simple equipment.
Solution Approach 2:
The invention controls electrode thickness and density by changing rolling parameters such as roller diameter, rolling pressure, and number of rolling passes. By adjusting these parameters, precise control over electrode dimensions is achieved without complex equipment modifications.
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 enables the production of electrodes with desired thickness and density, improving manufacturing efficiency and reducing costs by avoiding binder swelling and enhancing porosity, resulting in a more uniform and cost-effective production process.
Implementation Method 1
manufacturing an electrode sheet by compressing the mixture for an electrode with at least one pair of first rollers
Implementation Method 2
compressing the composite sheet with at least one pair of second rollers
Data Source
AI summary
A method of manufacturing an electrode for an all-solid-state battery is performed in a dry manner using first and second rollers. An electrode for an all-solid-state battery having an electrode layer with a desired thickness and a desired density of a mixture material may be manufactured by adjusting conditions of the first and the second rollers. The manufacturing speed may be accelerated, because there is no drying process, so that the efficiency of the manufacturing is improved. The process of thickening an electrode is realized by using the method and the porosity of the electrode for an all-solid-state battery manufactured thereby is excellent.