Sulfide Solid Electrolyte Ion Conductivity
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Solution Overview
Problem
Current lithium batteries rely on liquid electrolytes with flammable organic solvents, necessitating safety devices and complex structures, whereas solid electrolytes offer safer and more cost-effective alternatives, but existing sulfide solid electrolytes do not achieve optimal ion conductivity for high-output batteries.
Innovation Solution
A sulfide solid electrolyte material with a specific crystal structure comprising octahedrons and tetrahedrons, featuring elements like Li, Na, K, Mg, Ca, P, Ge, and S, which enhances ion conductivity by optimizing the crystal phase ratio and diffraction intensity ratios, allowing for a high-output battery design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolyte with flammable organic solvent is used, then ion conductivity is achieved, but safety risks and device complexity increase
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid, and modifies the chemical composition by using sulfide-based solid electrolyte materials with specific crystal structures (Li2S-P2S5-GeS2 system), thereby achieving both high ion conductivity and intrinsic safety without requiring additional safety devices
Solution Approach 2:
The patent replaces the liquid electrolyte system with a solid electrolyte system, substituting the fluid-based ion conduction mechanism with a solid-state crystal structure-based ion conduction mechanism, which eliminates the need for containment structures and safety devices while maintaining ion transport functionality
2Reliability
If conventional sulfide solid electrolyte composition is used, then solid electrolyte structure is achieved, but ion conductivity is insufficient for high-output batteries
Solution Approach 1:
The patent optimizes the compositional parameters within the Li2S-P2S5-GeS2 system, specifically controlling the ratios of these components to achieve the desired crystal structure (octahedron O with tetrahedrons T1 and T2), which directly enhances ion conductivity to levels suitable for high-output battery applications
Solution Approach 2:
The patent creates a composite solid electrolyte material by combining multiple sulfide compounds (Li2S, P2S5, GeS2) in specific proportions, forming a composite crystal structure that leverages the complementary properties of each component to achieve superior ion conductivity compared to individual materials
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 sulfide solid electrolyte material achieves excellent ion conductivity, enabling the development of high-output batteries with improved safety and reduced production costs by utilizing a solid electrolyte layer in lithium batteries.
Implementation Method 1
a sulfide solid electrolyte material having excellent ion conductivity
Implementation Method 2
a crystal structure having an octahedron O comprising an M1 element and an S element, a tetrahedron T1 comprising an M2a element and an S element, and a tetrahedron T2 comprising an M2b element and an S element, in which the above-mentioned tetrahedron T1 and the above-mentioned octahedron O share an edge, and the above-mentioned tetrahedron T2 and the above-mentioned octahedron O share a corner
Data Source
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AI summary
The problem of the present invention is to provide a sulfide solid electrolyte material having excellent ion conductivity. The present invention solves the problem by providing a sulfide solid electrolyte material comprising an M1 element (such as a Li element), an M2 element (such as a Ge element and a P element), and an S element; having a peak in a position of 2θ = 29.58°±0.50° in an X-ray diffraction measurement using a CuKα line; and having an IB/IA value of less than 0.50 when a diffraction intensity at the peak of 2θ = 29.58°±0.50° is represented by IA and a diffraction intensity at a peak of 2θ = 27.33°±0.50° is represented by IB.