Inorganic Solid Electrolyte Composition for Low Resistance Batteries

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Solution Overview

Problem

All-solid state secondary batteries with inorganic solid electrolytes face increased interface resistance due to restricted interfacial contact between solid particles, leading to decreased ion conductivity and cycle characteristics, necessitating a composition that enhances dispersion stability and handleability while reducing resistance.

Innovation Solution

An inorganic solid electrolyte-containing composition comprising an inorganic solid electrolyte, a polymer binder, and a metal element-containing compound dispersed in a medium, where the polymer binder is dissolved and the metal element-containing compound is in a solid state, interacting to form a film that suppresses reaggregation and sedimentation of particles, thereby reducing interface resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inorganic solid electrolyte particles are used to form constitutional layers, then ion conductivity can be improved, but interface resistance increases due to restricted interfacial contact between solid particles

Engineering Contradiction:

Improveion conductivityVSAvoidinterface resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a polymer binder as an intermediary substance between inorganic solid electrolyte particles. The binder fills the gaps between particles and creates conductive pathways, mediating the interfacial contact to reduce interface resistance while preserving the high ion conductivity of the solid electrolyte particles.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite material system combining inorganic solid electrolyte particles with a polymer binder matrix. This composite structure leverages the high ion conductivity of the inorganic particles while the polymer matrix provides continuous conductive pathways, achieving both high ion conductivity and low interface resistance through synergistic material combination.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If polymer binder is added to improve interfacial contact between solid particles, then interface resistance decreases, but dispersion stability and handleability deteriorate

Engineering Contradiction:

Improveinterface resistanceVSAvoiddispersion stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent optimizes the molecular weight, functional group composition, and concentration of the polymer binder to achieve the desired balance. By carefully controlling these parameters, the binder provides sufficient adhesion to reduce interface resistance while maintaining appropriate viscosity and dispersion stability for practical handling and processing.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If inorganic solid electrolyte composition is used instead of organic electrolytic solution, then safety and reliability improve, but manufacturing complexity increases

Engineering Contradiction:

ImprovesafetyVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs slurry-based processing methods where the inorganic solid electrolyte composition is formulated as a fluid suspension that can be pumped, coated, and processed using conventional hydraulic and pneumatic equipment. This approach enables the manufacturing of solid-state batteries using existing liquid handling infrastructure, reducing the complexity increase associated with transitioning from organic electrolytic solutions.

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 constitutional layer with low resistance and excellent cycle characteristics, enabling high ion conductivity and efficient charging/discharging, particularly suitable for electric vehicle applications.

Implementation Method 1

a polymer binder and a metal element-containing compound, interact to form a film

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

suppresses reaggregation and sedimentation of particles

Methodology Applied

Scientific EffectSedimentation: Sedimentation

Implementation Method 3

enabling high ion conductivity and efficient charging/discharging

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentUS20220344710A1Inorganic solid electrolyte-containing composition, sheet for all-solid state secondary battery, and all-solid state secondary battery, and manufacturing methods for sheet for all-solid state secondary battery and all-solid state secondary battery

Publication Date: 2022.10.27 FUJIFILM CORP

AI summary

An inorganic solid electrolyte-containing composition is an inorganic solid electrolyte-containing composition for an all-solid state secondary battery, containing an inorganic solid electrolyte, a polymer binder, a metal element-containing compound, and a dispersion medium, in which the metal element-containing compound is a compound that is capable of supplying, as an ion, a metal element constituting a molecule to a polymer that forms the polymer binder, and the polymer binder is dissolved in the dispersion medium, where the metal element-containing compound is present in a solid state.