Li-P-S-O Solid Electrolyte for High Conductivity and Stability
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Solution Overview
Problem
Current lithium batteries require solid electrolytes with higher ion conductivity and stability, as existing materials like Ge-based sulfide solid electrolytes have limitations in ion conductivity and chemical stability, and are costly.
Innovation Solution
A new sulfide solid electrolyte material with the composition Li4-4y-xP4+1+y-xS4-zOz, where 0.6≤x<1, 0≤z≤0.2, and −0.025≤y≤0.1, is developed, which exhibits high ion conductivity and chemical stability, and can be produced easily through a method involving the synthesis and heating of phosphorus, sulfur, and oxygen compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Ge-based sulfide solid electrolyte is used, then ion conductivity is improved, but chemical stability deteriorates and cost increases
Solution Approach 1:
The invention changes the compositional parameters by using Li-P-S-O system with specific stoichiometric ratios (Li: 3.0-3.8, P: 0.8-1.6, S: 3.2-3.8, O: 0.1-0.5) to achieve high ion conductivity without relying on Ge elements, thereby improving chemical stability while maintaining cost-effectiveness
Solution Approach 2:
The invention creates a composite solid electrolyte material by combining multiple elements (Li, P, S, O) in specific ratios to form a new compositional system that achieves both high ion conductivity and chemical stability, avoiding the limitations of single-element-based electrolytes
2Reliability
If Ge-based sulfide solid electrolyte is used, then ion conductivity is improved, but manufacturing cost increases
Solution Approach 1:
The invention replaces expensive Ge elements with abundant and cost-effective elements (Li, P, S, O) that can be obtained from common raw materials, significantly reducing manufacturing cost while maintaining high ion conductivity through optimized compositional ratios
3Reliability
If flammable organic solvents are used as electrolyte, then ion conductivity is improved, but safety deteriorates
Solution Approach 1:
The invention changes the physical state parameter of the electrolyte from liquid (organic solvent) to solid state, eliminating flammability while achieving high ion conductivity (10^-3 S/cm or higher) through the Li-P-S-O solid electrolyte system with optimized compositional parameters
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 new solid electrolyte material achieves high ion conductivity and chemical stability, making it suitable for improving battery performance and safety, while being cost-effective and easier to produce compared to existing materials.
Implementation Method 1
a solid electrolyte material including a Li element, a P (IV) element, a P (V) element, a S element, and an O element
Implementation Method 2
a method for producing the solid electrolyte material
Data Source
AI summary
In order to improve the stability of an electrolyte, an object of the present disclosure is to develop, among the sulfide solid electrolytes of Li—P—S—O based containing no metal element other than lithium, a new solid electrolyte having a possibility to have high ion conductivity and a method for producing for obtaining the same easily. The present disclosure achieves the object by providing a solid electrolyte material including a sulfide composition represented by a composition formula Li4-4y-xP4+1+y-xP5+xS4-zOz (Li4-4y-xP1+yS4-zOz), wherein 0.6≤x<1, 0≤z≤0.2, and −0.025≤y≤0.1, and a method for producing the same.