Metal Alkoxide-Coated Solid Electrolyte for Moisture-Stable Batteries
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Solution Overview
Problem
Sulfide-based solid electrolytes in all-solid-state rechargeable batteries face challenges with moisture stability and interfacial resistance, leading to deteriorated ion conductivity and cycle-life characteristics.
Innovation Solution
A solid electrolyte comprising sulfide-based solid electrolyte particles with a coating layer containing metal alkoxide, specifically including elements like Nb, Sb, Ti, or Zr, which is applied using a wet coating method without heat treatment to enhance moisture stability and reduce interfacial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolyte particles are used in all-solid-state rechargeable batteries, then high ion conductivity is achieved, but moisture stability deteriorates leading to decreased cycle-life characteristics
Solution Approach 1:
The patent applies composite materials by coating sulfide-based solid electrolyte particles with a metal oxide layer. This creates a composite structure where the inner sulfide core provides high ion conductivity while the outer metal oxide shell provides moisture stability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent uses a thin metal oxide coating layer (shell) on the sulfide-based solid electrolyte particles. This thin film structure protects the sulfide core from moisture exposure while maintaining the overall particle integrity and ion conductivity pathways.
2Reliability
If sulfide-based solid electrolyte particles are used, then high ion conductivity is achieved, but interfacial resistance increases leading to deteriorated cycle-life characteristics
Solution Approach 1:
The metal oxide coating layer acts as a protective shell that reduces interfacial resistance by providing a stable interface between the sulfide electrolyte particles and the electrode materials, preventing harmful reactions while maintaining good electrical contact.
Solution Approach 2:
The composite structure of sulfide core with metal oxide shell creates favorable interfacial properties that reduce resistance while preserving the high ion conductivity of the sulfide material.
3Stability of the object's composition
If a coating layer containing metal alkoxide is applied to sulfide-based solid electrolyte particles, then moisture stability is enhanced, but manufacturing process complexity increases
Solution Approach 1:
The metal oxide coating is applied in advance to the sulfide-based solid electrolyte particles before battery assembly. This preliminary coating action protects the particles from moisture exposure during subsequent handling and battery operation, enhancing moisture stability without requiring complex in-situ protection mechanisms.
Solution Approach 2:
The patent changes the physical-chemical parameters of the sulfide electrolyte particles by adding a metal oxide coating layer. This parameter change (adding a protective layer) significantly improves moisture stability while the coating process itself remains relatively simple and compatible with existing manufacturing techniques.
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 coated solid electrolyte improves ion conductivity retention over time and enhances the cycle-life characteristics and safety of all-solid-state rechargeable batteries by protecting the sulfide-based particles from moisture and reducing defects.
Implementation Method 1
a coating layer disposed on a surface of the sulfide-based solid electrolyte particles and including a metal alkoxide
Implementation Method 2
improves ion conductivity retention over time
Data Source
AI summary
A solid electrolyte, including sulfide-based solid electrolyte particles and a coating layer disposed on the surface of the sulfide-based solid electrolyte particles and including a metal alkoxide.