Sulfide Solid Electrolyte Composition for Dense Ionic Conduction
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Solution Overview
Problem
Solid electrolytes in all-solid-state lithium-ion batteries face challenges in ensuring adequate contact and density, leading to reduced ionic conductivity due to voids and friction between particles, and the addition of phosphine oxide compounds further exacerbates this issue.
Innovation Solution
A solid electrolyte composition comprising a sulfide solid electrolyte with lithium, phosphorus, and sulfur, combined with specific compounds having certain structural formulas, enhances particle contact and reduces friction, resulting in a dense structure with high ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid electrolyte is compressed to improve density, then contact between particles improves, but friction between particles increases and voids remain
Solution Approach 1:
The patent introduces a specific compound as an intermediary substance between solid electrolyte particles. This compound has low friction characteristics and acts as a mediator that reduces particle-to-particle friction during compression, enabling better densification and contact quality without the adverse effects of conventional phosphine oxide additives.
2Manufacturing precision
If phosphine oxide compound is added to solid electrolyte to improve density, then densification improves, but ionic conductivity is greatly reduced
Solution Approach 1:
The patent changes the chemical and physical parameters of the additive compound, selecting a specific compound with distinct molecular structure and properties that differ from conventional phosphine oxide compounds. This parameter change allows the additive to fulfill the densification function without the harmful side effect of reducing ionic conductivity.
3Volume of stationary object
If solid electrolyte particles are compressed to reduce voids, then density increases, but friction between particles increases
Solution Approach 1:
The specific compound serves as a lubricating intermediary between solid electrolyte particles during compression. It reduces the frictional forces that arise when particles are pressed together, enabling more effective void reduction and densification while maintaining low friction conditions.
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 composition achieves a dense structure with improved ionic conductivity, enhancing battery performance by minimizing voids and maintaining high conductivity despite compression.
Implementation Method 1
the inventors have found that the above problems can be solved by adding compound having the specific structure to the solid electrolyte
Implementation Method 2
a sulfide solid electrolyte comprising lithium, phosphorus and sulfur
Data Source
AI summary
A solid electrolyte composition including (A) a sulfide solid electrolyte including lithium, phosphorus and sulfur, and (B) one or more compounds selected from the compounds represented by the following formulas (1) to (17).R11R12R13P (1)(NR21R22)(NR23R24)(NR25R26)P (2)R31R32R33PS (3)(NR41R42)(NR43R44)(NR45R46)PS (4)R51SH (5)R61COOR62 (6)R71NH2 (7)R81R32R33N (8)R91(OA)nOH (9)(R101O)(R102O)(R103O)P (10)R111R112R113R114M1 (11)R121R122R123M2 (12)R131R132R133M3 (13)R141—C(═O)NH—R142 (14)R151R152R153C—OH (15)R161—O—R162 (16)(SR171)(SR172)(SR173)P (17)