Halogen-Modified Composite Solid Electrolyte for Battery Interfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior-art composite solid electrolytes exhibit very low lithium ion conductivity due to high activation energy at the interface between the oxide-based and sulfide-based solid electrolytes, leading to inhibited lithium ion transfer and resistance issues.
Innovation Solution
A composite solid electrolyte comprising an oxide-based solid electrolyte (Li7-3Y-Z, AlY)(La3)(Zr2-Z, MZ)O12 and a sulfide-based solid electrolyte VLiX-(1−V)((1−W)Li2S-WP2S5) with a halogen element, where the sulfide-based electrolyte contains LiX, reducing activation energy and minimizing chemical reactions at the interface, thereby enhancing lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a composite solid electrolyte is formed by combining oxide-based solid electrolyte and sulfide-based solid electrolyte, then formability at room temperature and chemical stability are improved, but lithium ion conductivity deteriorates due to high activation energy at the interface
Solution Approach 1:
The patent changes the chemical composition parameters of the sulfide-based solid electrolyte by introducing halogen elements (F, Cl, Br, I) to modify the interface properties. This compositional parameter change reduces the activation energy at the oxide-sulfide interface, thereby improving lithium ion conductivity while maintaining the composite structure's formability and chemical stability advantages
Solution Approach 2:
The patent creates a composite solid electrolyte system combining oxide-based and sulfide-based solid electrolytes with halogen modification. This composite structure leverages the formability and chemical stability of the oxide-sulfide combination while the halogen-containing sulfide component addresses the interface conductivity issue, achieving a balance of multiple properties
2Stability of the object's composition
If a composite solid electrolyte is formed by combining oxide-based solid electrolyte and sulfide-based solid electrolyte, then chemical stability is improved, but hydrogen sulfide production occurs due to chemical reactions at the interface
Solution Approach 1:
The patent modifies the chemical composition of the sulfide-based solid electrolyte by incorporating halogen elements, which changes the chemical reactivity parameters at the interface. This compositional modification suppresses the chemical reactions between oxide and sulfide components, reducing hydrogen sulfide production while preserving the chemical stability benefits of the composite structure
3Ease of manufacture
If the sulfide-based solid electrolyte is increased to improve lithium ion conductivity, then formability is improved, but chemical stability deteriorates due to increased hydrogen sulfide production
Solution Approach 1:
The patent changes the chemical composition parameters of the sulfide-based solid electrolyte by adding halogen elements, which modifies the interface chemistry. This allows the system to maintain higher sulfide content for improved formability while the halogen modification suppresses harmful chemical reactions, thereby reducing hydrogen sulfide production despite increased sulfide proportion
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 composite solid electrolyte achieves high lithium ion conductivity, allowing for easy battery formation at room temperature with improved chemical stability and reduced hydrogen sulfide production, enabling the production of high-power batteries.
Implementation Method 1
the sulfide-based electrolyte contains LiX, reducing activation energy and minimizing chemical reactions at the interface, thereby enhancing lithium ion conductivity
Implementation Method 2
high lithium ion conductivity
Data Source
AI summary
A composite solid electrolyte with excellent formability and chemical stability and high lithium ion conductivity. The composite solid electrolyte may comprise an oxide-based solid electrolyte and a sulfide-based solid electrolyte, wherein the oxide-based solid electrolyte is (Li7-3Y-Z, AlY)(La3)(Zr2-Z, MZ)O12 (where M is at least one element selected from the group consisting of Nb and Ta; Y is a number in a range of 0≤Y<0.22; and Z is a number in a range of 0≤Z≤2), and wherein the sulfide-based solid electrolyte is VLiX-(1−V)((1−W)Li2S-WP2S5) (where X is a halogen element; V is a number in a range of 0<V<1; and W is a number in a range of 0.125≤W≤0.30).