Low-Temperature Ion-Conductive Oxide for High-Conductivity Solid Batteries
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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−zMgxZryCezB3O9, 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 with controlled lattice volume and diffraction peak positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature heat treatment (900°C or more) is performed to reduce contact resistance between particles of oxide-based solid electrolyte, then ionic conductivity is improved, but the solid electrolyte and electrode active material react to form high-resistance phases, decreasing ionic conductivity and battery output
Solution Approach 1:
The invention changes the heat treatment temperature parameter from conventional high temperature (900°C or more) to a lower temperature range (500-800°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 invention uses a composite oxide-based solid electrolyte containing multiple cations (Li, Na, K, Ca, Sr, Ba, Mg, Al, Ga, In, Ti, Zr, Hf, Nb, Ta, W) in specific concentration ranges. This composite material approach enables the electrolyte to achieve high ionic conductivity at lower heat treatment temperatures while maintaining stability and preventing harmful reactions with electrode materials
2Object-affected harmful factors
If heat treatment temperature is reduced to less than 900°C to prevent reaction with electrode active material, then formation of high-resistance phase is prevented, but contact resistance between particles may increase, affecting ionic conductivity
Solution Approach 1:
The composite oxide-based solid electrolyte with multiple cations in optimized ratios provides intrinsic high ionic conductivity that compensates for potentially higher contact resistance at lower heat treatment temperatures. The synergistic effect of multiple cations enables achieving both low contact resistance and prevention of harmful reactions
Solution Approach 2:
The invention optimizes multiple parameters including heat treatment temperature (500-800°C), time (1-24 hours), and atmospheric conditions to achieve the desired balance between reducing contact resistance and preventing harmful reactions, thereby resolving the contradiction
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 and prevents the formation of high-resistant phases, resulting in improved output characteristics for all-solid-state batteries without the need for high-temperature processing.
Implementation Method 1
an electrolyte that is placed between the positive electrode and the negative electrode, and includes an ion conductive solid
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
Data Source
AI summary
An ion conductive solid that can be produced by heat treatment at low temperature and has a high ion conductivity; and an all-solid-state battery comprising the ion conductive solid, and the ion conductive solid comprising an oxide represented by Formula Li6+x−y−zY1−x−y−zMgxZryCezB3O9, in formula, x is a real number satisfying 0.005≤x≤0.800, y is a real number satisfying 0.000≤y≤0.400, z is a real number satisfying 0.000≤z≤0.400, and x, y, z are real numbers satisfying 0.005≤x+y+z<1.000.