Alkylene Oxide Polymer Functional Layer for Electrochemical Devices

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Solution Overview

Problem

Conventional electrochemical device compositions fail to enhance low-temperature output characteristics and high-voltage cycle characteristics effectively.

Innovation Solution

A composition for an electrochemical device functional layer containing a polymer with an alkylene oxide structure-containing monomer unit in a specific proportion, along with non-conductive particles, is used to form a functional layer that improves low-temperature output and high-voltage cycle characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional compositions with binders and non-conductive particles are used, then the basic structure of the functional layer is formed, but low-temperature output characteristics and high-voltage cycle characteristics are insufficient

Engineering Contradiction:

Improvelow-temperature output characteristics and high-voltage cycle characteristicsVSAvoidelectrolyte solution affinity

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the chemical composition parameters of the binder by specifying that it must contain a copolymer of ethylene oxide and propylene oxide with specific proportions (ethylene oxide: 20-80 mol%, propylene oxide: 20-80 mol%). This parameter change in the binder's molecular structure improves electrolyte solution affinity and enables excellent low-temperature output characteristics and high-voltage cycle characteristics without compromising the basic functional layer structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite binder material combining two different copolymers: a first copolymer with higher ethylene oxide content (20-80 mol%) and a second copolymer with lower ethylene oxide content (5-50 mol%). This composite material approach allows the binder to simultaneously achieve good adhesion, electrolyte solution affinity, and electrochemical performance across a wide temperature and voltage range.

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 described composition enhances the electrochemical device's performance by improving low-temperature output and high-voltage cycle characteristics, achieving better electrolyte solution affinity and reduced internal resistance.

Implementation Method 1

a polymer A including an alkylene oxide structure-containing monomer unit in a proportion of not less than 5 mol % and not more than 95 mol %

Methodology Applied

Scientific EffectSolvation: Solvation

Implementation Method 2

an electrochemical device including a functional layer can be caused to display excellent low-temperature output characteristics and high-voltage cycle characteristics

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS11721798B2Composition for electrochemical device functional layer, functional layer for electrochemical device, and electrochemical device

Publication Date: 2023.08.08 ZEON CORP

AI summary

A composition for an electrochemical device functional layer contains a polymer A and a solvent. The polymer A contained in the composition for an electrochemical device functional layer includes an alkylene oxide structure-containing monomer unit in a proportion of not less than 5 mol % and not more than 95 mol %.