Battery Electrode Binder Composition for Softness and Toughness

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Solution Overview

Problem

Existing binders for non-aqueous electrolyte batteries do not provide an electrode material layer with sufficient softness and toughness to withstand bending stress and tension during battery production, leading to potential cracking and reduced performance.

Innovation Solution

A binder for non-aqueous electrolyte batteries containing a polymer with a segment A having a glass transition temperature of 25°C or less and a segment B with a melting point of 50°C or more, which imparts both softness and toughness to the electrode material layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional binders are used for non-aqueous electrolyte batteries, then the electrode material layer can be formed, but the layer lacks sufficient softness and toughness to withstand bending stress and tension during production

Engineering Contradiction:

ImprovetoughnessVSAvoidcracking under stress

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The binder uses a copolymer comprising a first polymer chain with a glass transition temperature of 25°C or lower (providing softness) and a second polymer chain with a melting point of 50°C or higher (providing toughness). This composite polymer structure combines materials with different thermal properties to simultaneously achieve both softness and toughness, resolving the contradiction between these two mechanical properties.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention controls the glass transition temperature of the first polymer chain to be 25°C or lower and the melting point of the second polymer chain to be 50°C or higher. By precisely controlling these thermal parameters, the binder achieves optimal balance between softness (from low glass transition temperature) and toughness (from high melting point), enabling the electrode material layer to withstand production stresses without cracking.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the electrode material layer is made softer to withstand bending stress, then flexibility improves, but toughness and structural integrity may be compromised

Engineering Contradiction:

ImproveflexibilityVSAvoidstructural integrity

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The copolymer binder combines a first polymer chain (with glass transition temperature ≤25°C) that provides flexibility and softness, and a second polymer chain (with melting point ≥50°C) that provides structural integrity and toughness. This composite structure allows the electrode material layer to be both flexible enough to withstand bending stress and strong enough to maintain structural integrity during battery production.

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 binder forms an electrode material layer with excellent softness and toughness, enhancing the performance of non-aqueous electrolyte batteries by withstanding bending stress and tension during production without cracking.

Implementation Method 1

a segment A having a glass transition temperature of 25°C or less

Methodology Applied

Scientific EffectGlass transition:

Implementation Method 2

a segment B having a melting point of 50°C or more

Methodology Applied

Scientific EffectMelting: Melting

Data Source

PatentEP4715909A1Binder for nonaqueous electrolyte batteries, electrode mixture, electrode, and nonaqueous electrolyte battery

Publication Date: 2026.03.25 DAIKIN INDUSTRIES LTD

AI summary

Provided is a binder for a non-aqueous electrolyte battery, comprising a polymer comprising a segment A having a glass transition temperature of 25°C or less and a segment B having a melting point of 50°C or more.