Thin Sulfide Solid Electrolyte Film for Conductive Battery Stability
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Solution Overview
Problem
Existing sulfide-based all-solid-state batteries face limitations in ion conductivity and thickness, leading to reduced energy density and stability, with existing solutions failing to provide a thin, flexible, and long-lasting solid electrolyte film.
Innovation Solution
A solid electrolyte film composition for sulfide-based all-solid-state batteries using a sulfide-based solid electrolyte, a polymer binder without O, N, or F, and a solvent with a dielectric constant of 1.0<x<3.1, allowing for a thickness of 60 μm or less and stable operation for over 1000 hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the solid electrolyte is reduced to increase energy density, then the energy density is improved, but the stability and ion conductivity are worsened
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of Li2S, P2S5, and Li3PO4 to create a composite material that maintains high ion conductivity and stability even at reduced thickness of 60 μm or less
Solution Approach 2:
The patent uses a composite solid electrolyte material combining multiple sulfide-based compounds (Li2S-P2S5-Li3PO4 system) to achieve synergistic effects that improve both ion conductivity and structural stability, enabling thin film application without sacrificing performance
2Shape
If the thickness of the solid electrolyte is reduced to improve flexibility, then the flexibility is improved, but the ion conductivity and contact area are worsened
Solution Approach 1:
The patent modifies the physical and chemical parameters of the solid electrolyte composition to achieve optimal balance between flexibility and ion conductivity, using the Li2S-P2S5-Li3PO4 system with controlled ratios to maintain ionic pathways in thin flexible structures
Solution Approach 2:
The patent successfully creates a flexible thin film solid electrolyte with thickness of 60 μm or less that maintains high ion conductivity through optimized material composition, enabling the film to bend and conform while preserving ionic transport pathways
3Reliability
If a sulfide-based solid electrolyte is used to achieve high ion conductivity, then the ion conductivity is improved, but the contact area at the electrode interface is worsened
Solution Approach 1:
The patent uses a thin flexible film structure that can conform to the electrode surface topology, maximizing the contact area between the solid electrolyte and electrode active material while maintaining the high ion conductivity of sulfide-based materials
Solution Approach 2:
The patent optimizes the physical parameters of the solid electrolyte film including thickness, density, and surface morphology to improve interfacial contact with electrodes while preserving the intrinsic high ion conductivity of the sulfide-based composition
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 solution provides a thin, flexible, and highly conductive solid electrolyte film with improved ion conductivity, enhancing energy density and stability, enabling operation for up to 2000 hours.
Implementation Method 1
a solvent having a dielectric constant of x (1.0
Data Source
AI summary
A solid electrolyte film for sulfide-based all-solid-state batteries, and more particularly a composition of a solid electrolyte, a binder, and a solvent used to manufacture a solid electrolyte film for sulfide-based all-solid-state batteries that is thin and has high ion conductivity. In particular, a solid electrolyte film composition for sulfide-based all-solid-state batteries including a solvent having a dielectric constant of x (1.5<x<3.0). The thickness of a solid electrolyte film for sulfide-based all-solid-state batteries manufactured using the solid electrolyte film composition is 60 μm or less, and the solid electrolyte film is capable of being stably used for at least 1000 hours or more, and up to 2000 hours, based on the evaluation of Li plating and stripping.