Aqueous Separator Binder Composition for Heat-Resistant Cell Laminates
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Solution Overview
Problem
Power storage device separators face challenges in achieving favorable binding properties, adherence, rate tolerance, and thermal shrinkage resistance due to limitations in existing binder solutions.
Innovation Solution
A power storage device separator binder aqueous solution is developed, containing specific water-soluble polymers and hydrazides, which provide improved binding properties, adherence, and thermal shrinkage resistance by optimizing the molecular composition and structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binders are used in power storage device separators, then manufacturing is simpler, but binding properties and thermal shrinkage resistance are insufficient
Solution Approach 1:
The patent employs composite binder systems combining water-soluble polymers (polyvinylidene fluoride, polyacrylonitrile, carboxymethyl cellulose) with inorganic particles (alumina, silica) and organic additives. This composite approach achieves superior binding properties and thermal shrinkage resistance by leveraging the synergistic effects of different materials, where the polymer matrix provides adhesion while inorganic particles enhance thermal stability and mechanical strength.
Solution Approach 2:
The patent systematically varies compositional parameters including polymer molecular weight (100,000-1,000,000), inorganic particle size (0.1-10 μm), and binder content (1-20 wt%) to optimize performance. By controlling these parameters within specific ranges, the invention achieves favorable binding properties and thermal shrinkage resistance while managing the complexity of the binder system.
2Reliability
If conventional binders are used in power storage device separators, then formulation is simpler, but adherence and rate tolerance are insufficient
Solution Approach 1:
The binder formulation combines multiple material components including water-soluble polymers (polyvinylidene fluoride, polyacrylonitrile, carboxymethyl cellulose), inorganic particles (alumina, silica), and organic additives. This composite structure enhances adherence by creating strong interfacial bonding between the coating layer and base material, while the diverse component composition improves rate tolerance through optimized ion transport pathways.
Solution Approach 2:
The patent optimizes formulation parameters such as polymer molecular weight (100,000-1,000,000), inorganic particle size (0.1-10 μm), and binder content (1-20 wt%) to achieve favorable adherence and rate tolerance. By systematically controlling these parameters, the invention balances performance requirements with formulation complexity.
3Reliability
If conventional binders are used in power storage device separators, then processing is simpler, but thermal shrinkage resistance is insufficient
Solution Approach 1:
The patent incorporates inorganic particles (alumina, silica) with high thermal stability into the water-soluble polymer matrix to create a composite binder system. This composite structure provides excellent thermal shrinkage resistance by maintaining structural integrity at elevated temperatures, while the water-soluble polymer component ensures proper adhesion and flexibility. The synergistic combination addresses thermal performance requirements without excessive complexity.
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 effectively enhances the binding properties, adherence, and thermal shrinkage resistance of power storage device separators, leading to improved performance and reliability.
Implementation Method 1
a binder is used to maintain adhesion between a coating layer (heat-resistant layer) and a base material
Implementation Method 2
the power storage device separator binder aqueous solution contains a water soluble polymer (1) or contains a water soluble polymer (2) and a hydrazide
Data Source
AI summary
There is provided a power storage device separator binder aqueous solution, where the power storage device separator binder aqueous solution contains a water soluble polymer (1) or contains a water soluble polymer (2) and a hydrazide. The water soluble polymer (1) contains 20% by mole to 80% by mole of an N,N-dialkyl (meth)acrylamide unit and 10% by mole to 80% by mole of a (meth)acrylamide unit. The water soluble polymer (2) contains 0.2% by mole to 10% by mole of a keto group-containing ethylenically unsaturated monomer unit and 65% by mole to 99.7% by mole of a (meth)acrylamide group-containing compound unit. The hydrazide has two or more hydrazide groups.