Sulfide Solid Electrolyte Layer Balancing Voltage Resistance and Ion Flow
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Solution Overview
Problem
The electrolyte layer of a secondary battery containing a sulfide solid electrolyte faces a trade-off between achieving high voltage resistance and maintaining ionic conductivity, as adding insulating materials to enhance voltage resistance often decreases ionic conductivity.
Innovation Solution
Incorporating a perfluoropolyether represented by specific chemical formulas into the electrolyte layer alongside the sulfide solid electrolyte to improve voltage resistance while preserving ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating material is added to the electrolyte layer to increase voltage resistance, then voltage resistance is improved, but ionic conductivity decreases
Solution Approach 1:
The patent applies composite materials by combining sulfide solid electrolyte particles with perfluoropolyether binder to create an electrolyte layer that achieves both high voltage resistance and ionic conductivity. The specific composite structure allows the insulating sulfide particles to provide voltage resistance while the perfluoropolyether matrix maintains ion transport pathways.
Solution Approach 2:
The patent employs parameter changes by optimizing the ratio of sulfide solid electrolyte to perfluoropolyether, controlling particle size distribution, and adjusting the chemical composition parameters of the perfluoropolyether to achieve the optimal balance between voltage resistance and ionic conductivity in the electrolyte layer.
2Object-generated harmful factors
If the electrolyte layer contains sulfide solid electrolyte to achieve high ionic conductivity, then ionic conductivity is improved, but voltage resistance decreases
Solution Approach 1:
The patent uses composite materials where sulfide solid electrolyte particles are dispersed in a perfluoropolyether binder matrix. This composite structure allows the sulfide particles to provide high ionic conductivity while the perfluoropolyether binder provides the necessary voltage resistance, resolving the trade-off between these two properties.
Solution Approach 2:
The patent applies local quality by creating regions with different functional properties: sulfide solid electrolyte particles provide localized high ionic conductivity pathways, while the perfluoropolyether binder provides localized voltage resistance. This spatial differentiation of functions allows both properties to coexist in the same electrolyte layer.
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 electrolyte layer achieves both high voltage resistance and ionic conductivity, resulting in a secondary battery with lower overall resistance.
Implementation Method 1
the electrolyte layer contains a sulfide solid electrolyte and a perfluoropolyether... the electrolyte layer is likely to have both high voltage resistance and high ionic conductivity
Data Source
AI summary
In a secondary battery including an electrolyte layer containing a sulfide solid electrolyte, the electrolyte layer has both high voltage resistance and high ionic conductivity. The secondary battery of the present disclosure includes a positive electrode, an electrolyte layer, and a negative electrode, wherein the electrolyte layer contains a sulfide solid electrolyte and a perfluoropolyether represented by formula (1) below:where Rf1 and Rf2 are each independently a C1-16 divalent alkylene group which may be substituted with one or more fluorine atoms, E1 and E2 are each independently a monovalent group selected from the group consisting of a fluorine group, a hydrogen group, a hydroxyl group, an aldehyde group, a carboxylic acid group, a C1-10 alkyl ester group, an amide group which may have one or more substituents, and an amino group which may have one or more substituents, and RF is a divalent fluoropolyether group.