Fluoropolymer Solid Electrolyte Composition for Low-Viscosity Sheets
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Solution Overview
Problem
Existing all-solid state secondary batteries face challenges in maintaining dispersion stability and handleability of inorganic solid electrolytes, leading to issues such as reaggregation, sedimentation, and increased viscosity, which affect battery performance and cycle characteristics.
Innovation Solution
An inorganic solid electrolyte-containing composition is developed, comprising an inorganic solid electrolyte, a polymer binder with specific fluorine-based copolymer properties, and a dispersion medium, which maintains excellent dispersibility and fluidity, suppressing reaggregation and sedimentation, and ensuring a flat surface and low resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic solid electrolyte is used as electrolyte material, then ion conductivity is improved, but dispersion stability deteriorates due to reaggregation and sedimentation
Solution Approach 1:
A polymer binder is introduced as an intermediary substance between inorganic solid electrolyte particles to maintain dispersion stability. The binder prevents reaggregation and sedimentation of the electrolyte particles while allowing ion conduction, thus resolving the contradiction between improving ion conductivity and maintaining dispersion stability.
Solution Approach 2:
The invention creates a composite material system combining inorganic solid electrolyte particles with polymer binder and dispersion medium. This composite structure allows the inorganic electrolyte to provide high ion conductivity while the polymer matrix maintains dispersion stability and prevents particle aggregation.
2Reliability
If inorganic solid electrolyte is used, then battery performance is improved, but handleability deteriorates due to increased viscosity
Solution Approach 1:
The polymer binder acts as a mediator that reduces the viscosity increase caused by inorganic solid electrolyte particles. It provides a fluid matrix that allows easy handling and processing of the composition while maintaining the high battery performance benefits of the inorganic electrolyte.
Solution Approach 2:
The invention changes the physical and chemical parameters of the composition by selecting specific polymer binders and dispersion media that optimize viscosity. This allows the composition to maintain good handleability during processing while still achieving high battery performance through proper parameter selection.
3Quantity of substance
If inorganic solid electrolyte is used, then energy density is improved, but manufacturing precision deteriorates due to surface irregularities
Solution Approach 1:
The polymer binder serves as an intermediary that fills gaps and smooths surfaces between inorganic solid electrolyte particles. This creates a flat, uniform surface suitable for manufacturing processes while maintaining the high energy density provided by the inorganic electrolyte composition.
Solution Approach 2:
The invention optimizes manufacturing precision by controlling parameters such as particle size distribution, binder content, and processing conditions. These parameter adjustments ensure flat surface formation while maintaining high energy density through proper composition design.
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 improved dispersion stability, handleability, and cycle characteristics by preventing excessive viscosity and maintaining uniform particle distribution, resulting in a low-resistance constitutional layer with enhanced adhesiveness and reduced interfacial resistance.
Implementation Method 1
an adsorption rate of the polymer binder consisting of the fluorine-based copolymer with respect to the inorganic solid electrolyte is less than 60%
Data Source
AI summary
There is provided an inorganic solid electrolyte-containing composition containing an inorganic solid electrolyte, a polymer binder, and a dispersion medium, in which the polymer binder includes a polymer binder consisting of a fluorine-based copolymer which contains a vinylidene fluoride constitutional component and a hexafluoropropylene constitutional component of 21% to 65% by mole and in which a tensile fracture strain is 500% or more, and the adsorption rate of this polymer binder with respect to the inorganic solid electrolyte is less than 60%. There are also provided a sheet for an all-solid state secondary battery and an all-solid state secondary battery, in which this inorganic solid electrolyte-containing composition is used, and manufacturing methods for a sheet for an all-solid state secondary battery, and an all-solid state secondary battery.