Oxide Solid Electrolyte Composition for Low-Temperature Battery Sintering
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Solution Overview
Problem
Conventional oxide-based solid electrolytes in all-solid-state batteries require high-temperature heat treatment, leading to potential reactions with electrode active materials, which can form high-resistance phases and decrease ionic conductivity, thus affecting battery output.
Innovation Solution
An ion conductive solid represented by the formula Li6-x-y-zY1-x-y-zHfxZryCezB3O9, where x, y, and z are real numbers within specific ranges, is produced through low-temperature heat treatment, enhancing ionic conductivity and allowing for a monoclinic crystalline structure that adjusts lattice constants and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature heat treatment (900°C or more) is performed to reduce contact resistance between oxide-based solid electrolyte particles, then ionic conductivity is improved, but the solid electrolyte and electrode active material react to form high-resistance phases, decreasing output
Solution Approach 1:
The patent changes the heat treatment temperature parameter from conventional high temperatures (900°C or more) to a lower range (500-850°C). This parameter change resolves the contradiction by achieving sufficient ionic conductivity without causing harmful reactions between the solid electrolyte and electrode active material that form high-resistance phases
Solution Approach 2:
The patent uses a composite solid electrolyte comprising oxide-based solid electrolyte particles combined with sulfide-based solid electrolyte particles. This composite structure allows the oxide component to provide chemical stability while the sulfide component enhances ionic conductivity at lower temperatures, preventing high-resistance phase formation while maintaining high output characteristics
2Object-affected harmful factors
If oxide-based solid electrolyte is used to ensure safety by avoiding reactions with moisture and hydrogen sulfide generation, then safety is improved, but high-temperature heat treatment is required which causes reactions with electrode materials
Solution Approach 1:
The patent creates a composite solid electrolyte combining oxide-based particles (providing safety through chemical stability) with sulfide-based particles (enabling lower temperature processing). This composite approach allows safety to be maintained while avoiding the harmful reactions that occur with high-temperature heat treatment of pure oxide electrolytes
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 ion conductive solid achieves high ionic conductivity at lower temperatures, reducing the formation of high-resistance phases and improving battery output characteristics, while maintaining safety by avoiding high-temperature reactions.
Implementation Method 1
an ion conductive solid comprising an oxide represented by formula Li6-x-y-zY1-x-y-zHfxZryCezB3O9
Implementation Method 2
heat treatment is performed to reduce the contact resistance between the particles of an oxide-based material included in the solid electrolyte
Implementation Method 3
allowing for a monoclinic crystalline structure that adjusts lattice constants and conductivity
Data Source
AI summary
An ion conductive solid includes an oxide represented by the general formula Li6-x-y-zY1-x-y-zHfxZryCezB3O9, and the solid-state battery has at least a positive electrode, a negative electrode, and an electrolyte, and at least one element of the group consisting of the positive electrode, the negative electrode, and the electrolyte includes the ion conductive solid. (In the formula, x, y, and z are real numbers that satisfy the relationships 0.005≤x≤0.800, 0.000≤y≤0.400, 0.000≤z≤0.400, and 0.005≤x+y+z≤1.000.)