Solid electrolyte material and battery using same
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Solution Overview
Problem
Current solid electrolyte materials for batteries lack high lithium ion conductivity and stability, particularly at room temperature, which limits the performance of all-solid-state batteries.
Innovation Solution
A new solid electrolyte material with a MgCu2-type anion framework, comprising specific ratios of alkali and alkaline earth metal elements, transition metals, and Group 14-17 elements, enhancing ion conductivity and stability through a mechanochemical synthesis method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then structural stability is maintained, but lithium ion conductivity is insufficient particularly at room temperature
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating multiple cation types (alkali metals, alkaline earth metals, transition metals) and anion types (Group 14-17 elements) in specific molar ratios. This compositional parameter optimization enables high lithium ion conductivity (≥7×10−6 S/cm) at room temperature while maintaining structural stability
Solution Approach 2:
The patent creates a composite solid electrolyte material combining multiple element types in a MgCu2-type anion framework structure. The composite nature with cations A and B plus anions X and Z in controlled ratios produces synergistic effects that achieve both high ion conductivity and stability at room temperature
2Reliability
If complex multi-element compositions are used to improve ion conductivity, then lithium ion conductivity increases, but material stability decreases
Solution Approach 1:
The patent optimizes compositional parameters by specifying precise molar ratio ranges (1≤X:Z≤4, controlled amounts of cations A and B) within the MgCu2-type framework. This parameter control ensures high lithium ion conductivity while preventing compositional instability through defined stoichiometric constraints
Solution Approach 2:
The patent assigns different functional roles to different elements within the composite structure: cation A provides ion conductivity, cation B enhances stability, anions X and Z form the MgCu2-type framework. This functional differentiation at the local element level achieves both high conductivity and overall material stability
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 material achieves high lithium ion conductivity (≥7×10−6 S/cm at room temperature) and stability, enabling excellent charge and discharge characteristics in all-solid-state batteries.
Implementation Method 1
a cation A that is an ion conductive species
Implementation Method 2
high lithium ion conductivity (≥7×10−6 S/cm at room temperature)
Data Source
AI summary
A solid electrolyte material comprises a cation A that is an ion conductive species, a cation B that is not an ion conductive species, an anion X, and an anion Z. The cation A is at least one element selected from the group consisting of alkali and alkaline earth metal elements. The cation B is at least one element selected from the group consisting of alkali and alkaline earth metal elements other than the cation A, transition metal elements, and the Groups 13 to 16 elements. The anions X and Z are each independently at least one element selected from the group consisting of the Groups 14 to 17 elements. The anions X and Z constitute an anion framework having a MgCu2-type structure. The molar ratio of the anion X to the anion Z is greater than or equal to 1 and less than or equal to 4.