Dendritic Polymer Solid Electrolyte for All-Solid Batteries

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Solution Overview

Problem

All-solid state secondary batteries face challenges with poor affinity between electrode active material particles and solid electrolyte particles, leading to decreased ion conductivity due to the formation of fine pores, which requires pressurization to maintain performance.

Innovation Solution

A solid electrolyte composition incorporating a dendritic polymer with specific functional groups and an inorganic solid electrolyte, enhancing dispersion stability and ion conductivity without the need for pressurization by improving binding properties and interface formation between solid particles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solid electrolyte particles and electrode active material particles are used in all-solid state secondary batteries, then the batteries can achieve higher energy density and safety, but the affinity between particles is poor leading to decreased ion conductivity

Engineering Contradiction:

ImprovesafetyVSAvoidion conductivity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent introduces a binder as an intermediary substance between solid electrolyte particles and electrode active material particles. This binder improves the affinity and binding properties at particle interfaces, ensuring good contact and maintaining high ion conductivity without requiring pressurization. The binder acts as a mediator that bridges the interface between dissimilar solid particles, resolving the affinity problem while preserving the safety and energy density advantages of all-solid state batteries.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If solid electrolyte particles are used without pressurization, then the manufacturing process is simplified, but fine pores are generated among particles causing decreased ion conductivity

Engineering Contradiction:

Improvemanufacturing processVSAvoidion conductivity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The binder serves as a mediating substance that fills and seals the fine pores formed between solid particles during assembly without requiring pressurization. By introducing this intermediary material, the patent enables simple manufacturing processes while maintaining particle contact and preventing pore formation that would otherwise degrade ion conductivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the physical and chemical parameters of the interface between particles by introducing the binder. This modifies the binding properties and contact characteristics at the particle level, enabling the system to maintain high ion conductivity under ambient pressure conditions rather than requiring pressurized assembly and operation.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If pressurization is applied to maintain ion conductivity in all-solid state secondary batteries, then particle contact is improved, but the device complexity and operational requirements increase

Engineering Contradiction:

Improveion conductivityVSAvoidoperational requirements

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The binder acts as a permanent intermediary that establishes and maintains good particle contact during the assembly process itself, eliminating the need for continuous pressurization or complex pressure management systems. This reduces device complexity and operational requirements while maintaining high ion conductivity through improved particle affinity and interface contact.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 excellent ion conductivity and binding properties between solid particles, enabling the production of all-solid state secondary batteries that function effectively without pressurization, enhancing their performance and reliability.

Implementation Method 1

the affinity (binding property) among electrode active material particles, among the solid electrolyte particles, or between electrode active materials and solid electrolytes is poor

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

enhancing dispersion stability and ion conductivity without the need for pressurization by improving binding properties and interface formation between solid particles

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Data Source

PatentUS10854920B2Solid electrolyte composition, electrode sheet for all-solid state secondary battery, all-solid state secondary battery, and methods for manufacturing electrode sheet for all-solid state secondary battery and all-solid state secondary battery

Publication Date: 2020.12.01 FUJIFILM CORP

AI summary

Provided are a solid electrolyte composition containing at least one dendritic polymer selected from the group consisting of dendrons, dendrimers, and hyperbranched polymers and a specific inorganic solid electrolyte, in which the dendritic polymer has at least one specific functional group, an electrode sheet for an all-solid state secondary battery and an all-solid state secondary battery for which the solid electrolyte composition is used, a method for manufacturing an electrode sheet for an all-solid state secondary battery, and a method for manufacturing an all-solid state secondary battery.