Functional Layer Composition for Low-Temperature Electrochemical Output
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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 and a (meth)acrylic acid ester monomer unit, which forms a functional layer that improves low-temperature output and high-voltage cycle characteristics by increasing electrolyte solution affinity and providing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compositions with binders and non-conductive particles are used, then basic separator function is achieved, but low-temperature output characteristics and high-voltage cycle characteristics are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by specifying a polymer with particular structural characteristics (copolymer of ethylene oxide-propylene oxide units with specific molecular weight range of 1,000-10,000). This parameter change in the binder's chemical structure enables improved low-temperature output characteristics and high-voltage cycle characteristics without fundamentally altering the manufacturing process or composition type.
Solution Approach 2:
The invention uses a composite binder material formed by copolymerizing ethylene oxide and propylene oxide units in specific ratios (ethylene oxide units: 20-80 mol%, propylene oxide units: 20-80 mol%). This composite polymer structure combines the advantages of both monomer units to achieve the desired electrochemical performance characteristics.
2Reliability
If polymer amount in the composition is increased to improve characteristics, then low-temperature output characteristics improve, but manufacturing cost and composition complexity increase
Solution Approach 1:
The invention optimizes the polymer amount to a specific range (1-50 parts by mass per 100 parts by mass of non-conductive particles) to achieve the desired low-temperature output characteristics. This parameter optimization ensures sufficient polymer content for performance improvement while avoiding excessive composition complexity and manufacturing cost.
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 reducing internal resistance and preventing degradation during charging and discharging, resulting in improved low-temperature output and high-voltage cycle characteristics.
Implementation Method 1
forming the functional layer using a composition for an electrochemical device functional layer that contains a polymer including an alkylene oxide structure-containing monomer unit and a (meth)acrylic acid ester monomer unit... increasing electrolyte solution affinity... reducing internal resistance
Data Source
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 and a (meth)acrylic acid ester monomer unit.