All-Solid Battery Sheet Manufacturing Temperature Control
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Solution Overview
Problem
Existing manufacturing methods for all-solid state secondary batteries face challenges in achieving excellent cycle characteristics when using high-concentration inorganic solid electrolyte compositions, as the characteristics of the composition deteriorate with increased solid content concentration, and there is a need for improved dispersion and application suitability to enhance battery performance.
Innovation Solution
A manufacturing method for sheets in all-solid state secondary batteries involves setting the preparation temperature and application temperature of the inorganic solid electrolyte-containing composition between 35° C. to 90° C., maintaining a viscosity of 500 to 10,000 cP at 25° C., and ensuring a viscosity difference of 1,000 cP or more between temperatures, which improves dispersion characteristics and application suitability, even with high solid content concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the solid content concentration of the inorganic solid electrolyte-containing composition is increased to reduce manufacturing cost and environmental burden, then the manufacturing cost and environmental impact are improved, but the characteristics of the composition (dispersibility, ease of handling, adhesion) deteriorate significantly
Solution Approach 1:
The patent applies parameter changes by controlling the temperature of the inorganic solid electrolyte-containing composition within a specific range (5°C to 50°C, preferably 10°C to 40°C) during preparation and application. This temperature control modifies the physical state and flow characteristics of the composition, enabling high solid content concentration (50-90 mass%) to be maintained while preserving dispersibility, adhesion, and ease of handling. The temperature parameter adjustment resolves the contradiction by allowing high concentration without the usual deterioration of composition characteristics.
2Reliability
If the solid content concentration of the composition is increased to improve battery performance and cycle characteristics, then the cycle characteristics are improved, but the ease of manufacture and handling of the composition deteriorates
Solution Approach 1:
The patent uses parameter changes by maintaining the composition temperature within 5°C to 50°C during manufacturing processes. This temperature control enables the composition to maintain optimal viscosity and flow properties even at high solid content concentrations (50-90 mass%), thereby improving cycle characteristics while preserving ease of manufacture and handling. The controlled temperature ensures the composition remains workable during application and processing.
Solution Approach 2:
The patent applies preliminary action by pre-controlling the temperature of the inorganic solid electrolyte-containing composition before application. By preparing and maintaining the composition at the specified temperature range (5°C to 50°C) in advance, the patent ensures that the composition exhibits optimal handling characteristics and dispersibility when applied to the battery structure, thereby improving both cycle characteristics and ease of manufacture.
3Reliability
If the temperature of the composition is increased to improve dispersibility and application suitability, then the dispersion characteristics are improved, but the viscosity control and stability of the composition deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the temperature within a narrow range (5°C to 50°C) rather than using high temperatures. This controlled temperature adjustment improves dispersibility and application suitability while maintaining viscosity stability. The patent specifies that the temperature should be controlled to within ±5°C of the set point, ensuring that the composition maintains its stability while achieving optimal dispersion characteristics.
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 sheets that improve cycle characteristics of all-solid state secondary batteries by ensuring excellent dispersion and adhesion of solid particles, reducing void generation, and enhancing the overall performance of the battery.
Implementation Method 1
any one or both of a preparation temperature and a temperature before the application and the film formation is set to 35° C. to 90° C.
Implementation Method 2
ensuring a viscosity difference of 1,000 cP or more between temperatures
Data Source
AI summary
There is provided a manufacturing method for a sheet for an all-solid state secondary battery, including subjecting an inorganic solid electrolyte-containing composition containing an inorganic solid electrolyte and a dispersion medium to application and film formation onto a base material, in which in the inorganic solid electrolyte-containing composition, any one or both of a preparation temperature and a temperature before the application and the film formation is set to 35° C. to 90° C. There are also provided a manufacturing method for an all-solid state secondary battery, which carries out manufacture through this manufacturing method, a sheet for an all-solid state secondary battery, and an all-solid state secondary battery.