Polymer Electrolyte Battery Layer Ratio for Better Cycle Life

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Solution Overview

Problem

There is a need for improved cycle characteristics in solid-state batteries using polymer electrolytes.

Innovation Solution

A battery design comprising a positive electrode layer, a negative electrode layer, and an electrolyte layer with a polymer that preferentially conducts metal ions, with specific thickness ratios and incorporating functional groups for enhanced ion mobility and adhesion, along with the use of lithium composite oxides and specific electrode materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If polymer electrolytes are used in solid-state batteries, then safety and processability are improved, but cycle characteristics deteriorate

Engineering Contradiction:

ImprovesafetyVSAvoidcycle characteristics

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the thickness parameter of the electrolyte layer to a specific range (10:1 to 0.5:1 relative to positive electrode layer), which resolves the contradiction by optimizing the structural parameters to achieve both safety and improved cycle characteristics

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If polymer electrolytes are used in solid-state batteries, then processability is improved, but cycle characteristics deteriorate

Engineering Contradiction:

ImproveprocessabilityVSAvoidcycle characteristics

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The patent optimizes the thickness ratio parameter of the electrolyte layer to resolve the contradiction between ease of manufacture and cycle characteristics, maintaining processability while significantly improving cycle performance through precise dimensional control

Inventive Principle:

Principle #35Parameter changes

3Speed

If the electrolyte layer thickness is reduced, then ion conductivity is improved, but mechanical strength and adhesion deteriorate

Engineering Contradiction:

Improveion conductivityVSAvoidpeel strength

Core Design Contradiction:

SpeedVSStrength

Solution Approach 1:

The patent precisely controls the electrolyte layer thickness within a specific ratio range (10:1 to 0.5:1 relative to positive electrode layer), which simultaneously achieves high ion conductivity and maintains sufficient mechanical strength and adhesion properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a polymer electrolyte composite containing functional groups (anionic functional groups with alkali metal counter cations or anion scavenging functional groups) that enhance both ion conductivity and interfacial adhesion, resolving the contradiction between thinning for conductivity and maintaining strength

Inventive Principle:

Principle #40Composite materials

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 design provides a battery with superior cycle characteristics and improved ion conductivity, enhancing the overall performance and durability of the battery.

Implementation Method 1

the electrolyte layer contains a polymer having an ability to preferentially conduct metal ions

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentEP4607643A1battery

Publication Date: 2025.08.27 SUMITOMO CHEM CO LTD

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AI summary

Provided is a battery including a positive electrode layer, a negative electrode layer, and an electrolyte layer disposed between the positive electrode layer and the negative electrode layer, in which the electrolyte layer contains a polymer having an ability to preferentially conduct metal ions, and a thickness ratio between the positive electrode layer and the electrolyte layer is 10:1 to 0.5:1.