Sulfide Solid Electrolyte Composition for Non-Polar Solvent Coatability
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Solution Overview
Problem
Conventional solid electrolytes exhibit low dispersibility in organic solvents, particularly non-polar solvents, leading to insufficient coatability and potential deterioration when polar solvents are used for improvement.
Innovation Solution
A solid electrolyte composition comprising a sulfide solid electrolyte with lithium, phosphorus, and sulfur, combined with specific compounds having certain structural formulas, enhances dispersibility in non-polar organic solvents, improving coatability and maintaining ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional solid electrolyte is used, then the battery structure is simple, but the dispersibility in organic solvents is low resulting in insufficient coatability
Solution Approach 1:
A compound with specific structural formulas (1)-(3) acts as a dispersant intermediary between the sulfide solid electrolyte particles and non-polar organic solvents. The compound contains both polar groups (for interaction with solid electrolyte surface) and non-polar groups (for compatibility with non-polar solvents), enabling effective dispersion without requiring polar solvents that would deteriorate the solid electrolyte.
Solution Approach 2:
The invention changes the chemical composition parameters by introducing a dispersant compound with specific molecular structure characteristics. The dispersant contains polar functional groups (such as carbonyl, ether, or hydroxyl groups) and non-polar hydrocarbon chains, creating a amphiphilic structure that modifies the interfacial properties between solid electrolyte and solvent, enabling dispersion in non-polar solvents.
2Manufacturing precision
If a polar solvent is used to improve dispersibility, then the dispersibility is improved, but the solid electrolyte deteriorates
Solution Approach 1:
The dispersant compound serves as an intermediary that bridges the polar solid electrolyte surface and non-polar solvent environment. The compound's molecular structure includes polar functional groups that interact with the solid electrolyte surface through dipole-dipole interactions or hydrogen bonding, while the non-polar hydrocarbon portions are compatible with non-polar solvents, preventing electrolyte deterioration.
Solution Approach 2:
The invention changes the solvent system from polar to non-polar by introducing a dispersant that modifies the effective polarity at the solid-liquid interface. The dispersant's amphiphilic structure creates a protective interface layer that maintains solid electrolyte stability while enabling dispersion, effectively changing the interfacial polarity parameters without requiring bulk polar solvent.
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 composition achieves excellent dispersibility in non-polar solvents, enhancing coatability and maintaining high ionic conductivity, thereby improving battery performance while preventing electrolyte deterioration.
Implementation Method 1
a solid electrolyte composition comprising (A) a sulfide solid electrolyte comprising lithium, phosphorus and sulfur, and (B) one or more compounds selected from compounds represented by the following formulas (1) to (3)
Implementation Method 2
excellent dispersibility in non-polar organic solvent
Data Source
AI summary
A solid electrolyte composition including (A) a sulfide solid electrolyte including lithium, phosphorus and sulfur, and (B) one or more compounds selected from the compounds represented by the following formulas (1) to (3).