Solid Electrolyte Composition for Uniform Battery Membrane Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional solid electrolyte compositions for all-solid-state batteries suffer from agglomeration of the solid electrolyte, leading to uneven dispersion and reduced performance, including non-uniform thickness and low ionic conductivity of the resulting solid electrolyte membrane, which degrades the battery's performance.
Innovation Solution
Incorporating a carboxylic acid compound with a weight-average molecular weight of 1,000 to 5,000 as a dispersant in the solid electrolyte composition to suppress agglomeration and enhance dispersion, resulting in a uniform thickness and high ionic conductivity of the solid electrolyte membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional solid electrolyte compositions are used, then the solid electrolyte can be applied to form a membrane, but the solid electrolyte agglomerates leading to non-uniform dispersion and uneven thickness
Solution Approach 1:
The patent introduces a dispersant as an intermediary substance to mediate between the solid electrolyte particles and the composition matrix. The dispersant adsorbs onto the solid electrolyte particle surfaces, providing steric or electrostatic repulsion that prevents agglomeration and ensures uniform dispersion throughout the composition, thereby achieving both good dispersion stability and uniform membrane thickness
Solution Approach 2:
The patent optimizes specific parameters including the dispersant concentration (0.1-5 wt%), molecular weight of dispersant (1,000-100,000), and solid electrolyte particle size (0.1-10 μm) to achieve the optimal balance between dispersion uniformity and membrane thickness uniformity. By adjusting these parameters, the system transitions from agglomerated to uniformly dispersed states
2Reliability
If the solid electrolyte is not sufficiently dispersed, then the composition can be manufactured, but the solid electrolyte membrane exhibits low ionic conductivity
Solution Approach 1:
The dispersant acts as a mediator that ensures uniform distribution of solid electrolyte particles throughout the composition. This uniform dispersion creates continuous ion transport pathways in the resulting membrane, eliminating isolated particle regions that would impede ionic conductivity. The dispersant thus bridges the gap between manufacturing simplicity and high ionic conductivity
Solution Approach 2:
The patent identifies and optimizes critical parameters such as dispersant-to-solid electrolyte ratio, mixing speed, and drying temperature to achieve sufficient dispersion. These parameter optimizations ensure that the solid electrolyte particles are evenly distributed without requiring complex manufacturing processes, thereby maintaining ease of manufacture while achieving high ionic conductivity
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 use of the carboxylic acid dispersant improves the dispersion of the solid electrolyte, leading to a solid electrolyte membrane with uniform thickness and enhanced ionic conductivity, thereby improving the performance and lifetime characteristics of the all-solid-state battery.
Implementation Method 1
using a carboxylic acid compound with a weight average molecular weight of 1,000 to 5,000 as a dispersant in a solid electrolyte composition for all-solid-state batteries can suppress the agglomeration of the solid electrolyte within the composition and improve dispersion
Data Source
AI summary
A solid electrolyte composition for an all-solid-state battery includes a solid electrolyte, a binder, a solvent, and a dispersant, wherein the dispersant is a carboxylic acid compound with a weight-average molecular weight of 1,000 to 5,000, a solid electrolyte membrane made therefrom, and an all-solid-state battery comprising the same.