Sulfide Solid Electrolyte Slurry for Uniform Layer Formation
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Solution Overview
Problem
Existing all-solid state secondary batteries face issues with non-uniform dispersion of solid particles in the solid electrolyte and electrode active material layers, leading to irregular aggregation and low reproducibility in layer formation, which affects battery performance and safety.
Innovation Solution
A solid electrolyte composition containing a sulfide-based inorganic solid electrolyte and multiple alkane dispersion media with specific retention time differences, ensuring uniform dispersibility and high reproducibility of the solid electrolyte and electrode active material layers during evaporation or volatilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional slurries are used to form solid electrolyte layers, then the layer formation process is simple, but solid particles are present non-uniformly and reproducibility is low
Solution Approach 1:
The patent uses a composite dispersion medium comprising multiple alkane components (n-heptane, n-octane, n-nonane, n-decane, and/or n-undecane) in specific proportions to achieve uniform solid particle dispersion. This composite approach allows the dispersion medium to provide both good wetting properties and controlled evaporation characteristics, resulting in uniform solid electrolyte layers with high reproducibility.
Solution Approach 2:
The patent optimizes specific parameters of the dispersion medium including the carbon number distribution of alkanes (C7-C11), the proportion of each alkane component, and the retention time differences in gas chromatography analysis. By controlling these parameters, the patent achieves uniform particle dispersion while maintaining process simplicity.
2Stability of the object's composition
If solid particles are dispersed in conventional slurries, then the layer formation is straightforward, but irregular aggregation occurs during drying
Solution Approach 1:
The patent segments the dispersion medium into multiple alkane components with different carbon numbers (C7-C11), each contributing different evaporation rates and wetting properties. This segmentation allows the mixture to maintain stable solid particle suspension during application and prevent irregular aggregation during drying, while keeping the manufacturing process straightforward.
Solution Approach 2:
The multi-component alkane dispersion medium acts as an intermediary substance that facilitates uniform solid particle distribution and controlled solvent evaporation. The specific combination of alkanes mediates between the solid particles and the environment, preventing aggregation while maintaining ease of manufacture through simple coating processes.
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 solution achieves uniform particle dispersion and high reproducibility in the solid electrolyte and electrode active material layers, enhancing the discharging capacity and stability of all-solid state secondary batteries while preventing variations.
Implementation Method 1
uniform dispersibility of solid particles (for example, sulfide-based inorganic solid electrolyte), and can form the solid electrolyte layer or the electrode active material layer with high reproducibility
Data Source
Figure 1~2
AI summary
Provided are a solid electrolyte composition including a sulfide-based inorganic solid electrolyte and a plurality of kinds of alkane dispersion media, in which the plurality of kinds of alkane dispersion media include, with respect to a peak of each alkane dispersion medium obtained by measurement under specific conditions using a gas chromatography, two kinds of alkane dispersion media in which a difference in retention time between mutually adjacent peaks of dispersion media is more than 0 minutes and within 0.2 minutes, a solid electrolyte-containing sheet, an all-solid state secondary battery, and methods for manufacturing a solid electrolyte-containing sheet and an all-solid state secondary battery.