Ester Solvent Solid Electrolyte Slurries for Stable Coating Rheology
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in preparing slurries containing solid electrolyte materials for electrochemical cells that maintain desired rheological properties without degrading the electrolyte material, which is crucial for effective coating and drying processes in solid-state batteries.
Innovation Solution
The use of specific ester solvents with Hansen Solubility Parameters, such as 2-ethyl-hexyl acetate, octyl acetate, or amyl propionate, combined with a solid electrolyte material and optional additives like binders and conductive agents, to create stable slurries that prevent degradation and ensure proper coating and drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional solvents are used to prepare slurry, then the slurry achieves desired rheological properties for coating, but the solid electrolyte material degrades
Solution Approach 1:
The patent changes the chemical parameters of the solvent by specifying ester solvents with particular molecular structures (R1 = H, methyl, or ethyl; R2 = acyclic linear or branched hydrocarbon chain with 5-20 carbon atoms) and specific Hansen solubility parameters (δ = 16.4-18.2 MPa1/2, δD = 15-18.2 MPa1/2, δP = 4-6 MPa1/2, δH = 0-6 MPa1/2). This parameter optimization allows the slurry to achieve proper rheological properties while preventing solid electrolyte degradation.
Solution Approach 2:
The ester solvent acts as an intermediary substance that mediates between the solid electrolyte particles and the coating process. It provides a compatible chemical environment that maintains electrolyte stability while enabling proper slurry flow and coating characteristics.
2Loss of time
If the slurry is stored for extended periods, then processing time is flexible, but the solid electrolyte material degrades
Solution Approach 1:
By optimizing the solvent's Hansen solubility parameters particularly the polar dipolar component (δP = 4-6 MPa1/2), the patent creates a chemical environment that prevents electrolyte degradation over time, enabling extended slurry storage without substantial composition changes.
3Stability of the object's composition
If solvents with high solubility power are used, then slurry homogeneity is improved, but the solid electrolyte material degrades
Solution Approach 1:
The patent optimizes the total Hansen solubility parameter (δ = 16.4-18.2 MPa1/2) and its components to achieve balanced solubility power. This provides sufficient slurry homogeneity while maintaining electrolyte integrity through the specifically balanced polar and hydrogen bonding 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
These solvents enhance the stability of the slurry, allowing the solid electrolyte material to retain its ionic conductivity and maintain desired rheological properties, ensuring effective electrochemical performance and prolonged suspension of particles without reacting with the electrolyte.
Implementation Method 1
The choice of solvent may be important. The choice of solvent is even more important in slurries that contain solid electrolytes, as the solvent may degrade the solid electrolyte material.
Implementation Method 2
To achieve a homogenous slurry with the proper rheological properties to coat the slurry on a substrate
Implementation Method 3
coated on a substrate, and then dried
Data Source
AI summary
Described herein are slurries comprising a solid electrolyte material and an ester solvent, and methods of making the same.