Cellulose Derivative Binder Composition for Fast Electrode Wetting
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Solution Overview
Problem
Conventional cellulose derivatives used in secondary battery binders face challenges such as slow dissolution rates, microgel formation, and limited immersion properties in electrolytes, which hinder the efficiency and reliability of the electrode preparation process.
Innovation Solution
A cellulose derivative composition is developed, where hydroxyl groups in cellulose-based polymers are substituted with functional groups containing monovalent metals like lithium, potassium, or cesium, improving wetting and dissolution properties, and incorporating a styrene-butadiene rubber emulsion to enhance the binder's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cellulose derivatives are used as binders, then the electrode structure is maintained, but the dissolution rate is slow and microgels form
Solution Approach 1:
The patent modifies the chemical structure of cellulose derivatives by substituting hydroxyl groups with carboxymethyl groups and introducing monovalent metal ions (Li+, Na+, K+, Rb+, Cs+). This parameter change in molecular structure fundamentally alters the dissolution behavior, enabling rapid dissolution without microgel formation while maintaining binder functionality.
Solution Approach 2:
The patent creates a composite binder system combining modified cellulose derivative polymers with monovalent metal ions. This composite structure leverages the polymer matrix for structural integrity while the metal ion-substituted carboxymethyl groups provide rapid dissolution and prevent microgel formation through enhanced ionic interactions.
2Speed
If conventional binders are used, then the electrode is structurally stable, but the initial wetting rate is slow
Solution Approach 1:
The substitution of hydroxyl groups with carboxymethyl groups containing monovalent metals fundamentally changes the surface properties and electrostatic interactions of the binder. This parameter change enables rapid electrolyte wetting through enhanced ionic attraction while the crosslinked polymer network maintains structural stability.
3Productivity
If standard electrode preparation processes are used, then the process is straightforward, but the preparation efficiency is low
Solution Approach 1:
The binder is pre-modified with carboxymethyl groups and monovalent metal ions before electrode assembly. This preliminary chemical modification ensures rapid dissolution and uniform distribution during slurry preparation, significantly improving preparation efficiency without requiring complex additional processing steps.
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 modified cellulose derivative composition improves the initial wetting rate, dissolution rate, and immersion properties in electrolytes, reducing microgel formation, simplifying the electrode preparation process, and enhancing the reliability and energy density of secondary batteries.
Implementation Method 1
improving an initial wetting rate
Implementation Method 2
improving a dissolution rate
Data Source
AI summary
Provided is a cellulose derivative composition for a secondary battery binder, a method of preparing a composition for a secondary battery electrode, including the same, and a secondary battery including the same. According to the inventive concept, the cellulose derivative composition for a secondary battery binder may include a compound represented by Formula 1 below.