Sulfide Solid Electrolyte Coating for High Conductivity Without Aggregation
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Solution Overview
Problem
Solid electrolytes in batteries face challenges such as low ion conductivity, interface resistance with solid particles, and ion conduction performance deterioration due to solid-to-solid bonding, particularly in all-solid-state batteries.
Innovation Solution
A solid electrolyte is developed by mixing sulfide-based solid electrolyte particles with lithium-metal-oxide and performing heat treatment at 250° C. to 350° C., which improves crystallinity and ion conductivity while preventing particle aggregation and growth, resulting in a high-density electrode plate and electrolyte film with enhanced moisture stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat treatment is performed to improve crystallinity and ion conductivity, then ion conductivity is improved, but particle aggregation and growth occur
Solution Approach 1:
The invention optimizes heat treatment parameters by conducting treatment at 200-400°C for 1-24 hours, a controlled temperature and time range that improves crystallinity without causing excessive particle growth or aggregation, thus maintaining narrow particle size distribution.
Solution Approach 2:
The invention performs surface coating with oxide-based material before heat treatment. This preliminary action protects particles during subsequent heat treatment, preventing aggregation and growth while allowing crystallinity improvement.
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 high ion conductivity, improved capacity and cycle-life characteristics, and maintains a uniform particle size distribution, effectively addressing the limitations of existing solid electrolytes in all-solid-state batteries.
Implementation Method 1
performing heat treatment at about 250° C. to about 350° C.
Implementation Method 2
in an X-ray diffraction (XRD) analysis of the solid electrolyte, a full width at half maximum (FWHM) of a main peak is less than or equal to about 0.160
Data Source
AI summary
A solid electrolyte includes sulfide-based solid electrolyte particles and lithium-metal-oxide on the surface of the particles, wherein in an X-ray diffraction analysis of the solid electrolyte, a full width at half maximum of a main peak is less than or equal to about 0.160.