Aqueous Electrode Binder Composition for Strength and Capacity Retention
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Solution Overview
Problem
Existing power storage devices face challenges in achieving high pencil hardness, breaking strength, initial Coulombic efficiency, and discharge capacity retention rate.
Innovation Solution
A power storage device binder aqueous solution comprising a water-soluble polymer, (meth)acrylamide, and (meth)acrylonitrile, with specific content ratios of polymerization initiator units and (meth)acrylamide, is used to create a power storage device slurry, electrode, and separator/electrode laminate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a water-soluble polymer is used as a binder in power storage devices, then the manufacturing process is simplified and environmental compatibility is improved, but the pencil hardness and breaking strength of the electrode are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by incorporating specific ratios of (meth)acrylamide units (1-99.998 mol%) and (meth)acrylonitrile units (0.002-99.9 mol%) into the water-soluble polymer structure. This compositional parameter adjustment enables the binder to achieve both water solubility for easy manufacturing and sufficient mechanical strength for electrode integrity.
2Ease of manufacture
If a water-soluble polymer is used as a binder in power storage devices, then the manufacturing process is simplified and environmental compatibility is improved, but the initial Coulombic efficiency and discharge capacity retention rate are insufficient
Solution Approach 1:
The patent adjusts the chemical composition parameters of the binder by incorporating specific ratios of (meth)acrylamide units (1-99.998 mol%) and (meth)acrylonitrile units (0.002-99.9 mol%) into the water-soluble polymer structure. This compositional parameter adjustment enables the binder to achieve both water solubility for easy manufacturing and sufficient mechanical strength for electrode integrity.
3Strength
If the (meth)acrylamide content is increased to improve binding performance, then the breaking strength increases, but the water solubility and environmental compatibility decrease
Solution Approach 1:
The patent creates a composite polymer structure combining (meth)acrylamide units and (meth)acrylonitrile units in specific ratios. The (meth)acrylamide units provide hydrogen bonding capability for water solubility, while the (meth)acrylonitrile units contribute to mechanical strength. This composite structure achieves both water solubility and sufficient breaking strength simultaneously.
4Strength
If the polymerization initiator unit content is increased to improve crosslinking and strength, then the breaking strength increases, but the water solubility and processing ease decrease
Solution Approach 1:
The patent optimizes the polymerization initiator unit content parameter within a specific range (0.01 mass% to 1 mass%) in the water-soluble polymer. This parameter control ensures sufficient crosslinking for mechanical strength while maintaining water solubility and processing ease by preventing excessive crosslinking that would compromise solubility.
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 solution enhances the pencil hardness, breaking strength, and discharge capacity retention rate of power storage devices.
Implementation Method 1
the water-soluble polymer includes 0.01 mass% to 1 mass% of a polymerization initiator unit
Data Source
AI summary
Provided is a power storage device binder aqueous solution comprising: a water-soluble polymer; a (meth)acrylamide; and a (meth)acrylonitrile, wherein the water-soluble polymer includes 0.01-1 mass% of a polymerization initiator unit, and the content of the (meth)acrylamide with respect to the water-soluble polymer is 0.01-1,000 mass ppm (exclusive of 1,000 mass ppm).