Solid Electrolyte Composition for All-Solid State Battery Bonding

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Solution Overview

Problem

All-solid state secondary batteries face challenges in enhancing the bonding property between solid particles, which affects their cycle characteristics and reliability, particularly in lithium ion batteries using organic electrolytic solutions.

Innovation Solution

A solid electrolyte composition containing an inorganic solid electrolyte with ion conductivity for metals in Group I or II and a compound having an anionic polymerizable functional group, which improves bonding and cycle characteristics through anionic polymerization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an inorganic solid electrolyte is used instead of an organic electrolytic solution, then safety and reliability are significantly improved, but the bonding property between solid particles deteriorates

Engineering Contradiction:

ImprovesafetyVSAvoidbonding property

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

A polymer compound is introduced as an intermediary substance between inorganic solid electrolyte particles and electrode active materials. This polymer compound contains functional groups that can coordinate with metal ions, creating a bridging effect that enhances bonding between solid particles while maintaining the safety advantages of inorganic electrolytes.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite structure combining inorganic solid electrolyte particles with polymer compounds. This composite material approach allows the system to benefit from both the high safety and reliability of inorganic electrolytes and the excellent bonding properties of polymer materials, resolving the contradiction between these two properties.

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If an inorganic solid electrolyte is used instead of an organic electrolytic solution, then service life is extended, but the bonding property between solid particles deteriorates

Engineering Contradiction:

Improveservice lifeVSAvoidbonding property

Core Design Contradiction:

Duration of action of stationary objectVSStrength

Solution Approach 1:

The polymer compound serves as a mediator that improves interfacial bonding between inorganic solid electrolyte particles and electrode materials. By enhancing this bonding, the composite structure prevents particle detachment during cycling, thereby extending service life while addressing the bonding deficiency of pure inorganic electrolytes.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The composite material system combines the long-term stability of inorganic solid electrolytes with the adhesive properties of polymers. This combination maintains the extended service life advantage while compensating for poor bonding through the polymer matrix that holds particles together during operation.

Inventive Principle:

Principle #40Composite materials

3Strength

If a polymer compound is added to improve bonding property, then bonding between solid particles is enhanced, but device complexity increases

Engineering Contradiction:

Improvebonding propertyVSAvoidcomposition complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The invention optimizes parameters such as polymer compound molecular weight, functional group type, and concentration to achieve effective bonding enhancement. By carefully controlling these parameters, the system improves bonding properties while minimizing the impact on device complexity and maintaining manufacturing feasibility.

Inventive Principle:

Principle #35Parameter changes

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 enhances the bonding property and cycle characteristics of all-solid state secondary batteries, reducing interface resistance and improving their performance and longevity.

Implementation Method 1

a compound having an anionic polymerizable functional group... which improves bonding and cycle characteristics through anionic polymerization

Methodology Applied

Scientific EffectAnionic polymerization: Photopolymerisation

Implementation Method 2

an inorganic solid electrolyte having a conductivity for ions of metals belonging to Group I or II of the periodic table

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentUS10833351B2Solid electrolyte composition, solid electrolyte-containing sheet, all-solid state secondary battery, and methods for manufacturing solid electrolyte composition, solid electrolyte-containing sheet, all-solid state secondary battery

Publication Date: 2020.11.10 FUJIFILM CORP

AI summary

Provided are a solid electrolyte composition containing an inorganic solid electrolyte having a conductivity for ions of metals belonging to Group I or II of the periodic table and a compound having an anionic polymerizable functional group, a solid electrolyte-containing sheet containing an inorganic solid electrolyte having a conductivity for ions of metals belonging to Group I or II of the periodic table and an anionic polymer which bonds to the inorganic solid electrolyte, and an all-solid state secondary battery, and methods for manufacturing the solid electrolyte composition, the solid electrolyte-containing sheet, and the all-solid state secondary battery.