Composite Solid-State Electrolyte for Moisture-Stable Ion Conduction
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Solution Overview
Problem
Current solid-state batteries face challenges with ion conductivity and chemical stability, particularly due to the use of Li oxide solid-state electrolytes which are expensive and prone to property changes and moisture-induced deterioration, leading to decreased performance over time.
Innovation Solution
A solid-state electrolyte for solid-state batteries is developed by combining a lithium salt solid-state electrolyte with a non-lithium compound, such as Al2O3 or TiO2, to enhance ion conductivity and chemical stability, eliminating the need for Li oxide electrolytes and thus preventing moisture-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Li oxide solid-state electrolytes are used, then chemical stability is improved, but cost increases and property changes occur leading to decreased performance
Solution Approach 1:
The patent combines Li oxide solid-state electrolyte particles with non-lithium compound particles (such as Al2O3, TiO2, or SiO2) to form a composite solid-state electrolyte layer. This composite structure maintains the chemical stability benefits of Li oxide electrolytes while reducing cost and preventing property changes by incorporating stable non-lithium compounds that resist moisture-induced deterioration.
2Reliability
If Li oxide solid-state electrolytes are used, then ion conductivity is improved, but moisture-induced deterioration occurs leading to decreased performance
Solution Approach 1:
The non-lithium compound particles act as an intermediary protective phase between the Li oxide solid-state electrolyte and moisture from the environment. This intermediary layer prevents direct contact between moisture and the Li oxide electrolyte, thereby preventing hydrolysis and property changes while maintaining ion conductivity pathways for lithium ion transport.
3Productivity
If Li oxide solid-state electrolytes are used, then performance is improved, but property changes occur over time leading to decreased reliability
Solution Approach 1:
By creating a composite structure where Li oxide solid-state electrolyte particles are dispersed in a matrix of stable non-lithium compounds, the patent achieves both high performance and long-term property stability. The non-lithium compound matrix provides structural support and prevents aggregation or transformation of the Li oxide particles, maintaining consistent performance over time.
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 proposed solid-state electrolyte achieves superior ion conductivity and chemical stability, enabling fast charging and high output while resisting deterioration reactions, thereby improving the overall performance and reliability of solid-state batteries.
Implementation Method 1
combining a lithium salt solid-state electrolyte with a non-lithium compound, such as Al2O3 or TiO2, to enhance ion conductivity and chemical stability
Data Source
AI summary
A solid-state electrolyte for a solid-state battery, the solid-state electrolyte including: a lithium salt solid-state electrolyte part; and a non-lithium compound part embedded in the lithium salt solid-state electrolyte part. Preferably, the lithium salt solid-state electrolyte part has an antiperovskite structure, and the non-lithium compound part includes an inorganic insulating material.