Electrode Binder Composition for Flexibility and Crack Resistance
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Solution Overview
Problem
Conventional compositions for electrochemical devices struggle to increase the flexibility of electrodes and inhibit cracking of electrode active materials.
Innovation Solution
A composition for electrochemical devices is developed, featuring a polymer with a nitrile group-containing monomer unit, either a conjugated diene monomer unit or an alkylene structural unit, and a specific terminal structure derived from compounds represented by formula (1) or (2), with a concentration of divalent or higher-valent metal ions between 5 mass ppm and 4,000 mass ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binder compositions are used to form electrode mixed material layers, then the electrode can be produced with basic structural integrity, but the electrode flexibility is insufficient and cracking of electrode active material occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by incorporating specific polymers (polyacrylonitrile, polyacrylic acid, polyacrylamide, carboxymethyl cellulose, or starch) and controlling the metal ion concentration (5-4000 mass ppm), which transforms the binder's mechanical properties to achieve both flexibility and cracking resistance
Solution Approach 2:
The patent creates a composite binder system by combining organic polymer binders with inorganic metal ions (divalent or higher-valent), where the metal ions enhance the binder's adhesion and structural strength while the polymer matrix provides flexibility, resulting in a composite material that simultaneously improves both electrode flexibility and cracking resistance
Data Source
AI summary
A composition for an electrochemical device contains a polymer that includes a nitrile group-containing monomer unit and either or both of a conjugated diene monomer unit and an alkylene structural unit and that has a structure derived from a specific compound on at least one terminal. The composition has a concentration of divalent or higher-valent metal ions of not less than 5 mass ppm and not more than 4,000 mass ppm.