Non-aqueous Battery Adhesive Layer Viscosity Control
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Solution Overview
Problem
Existing non-aqueous secondary battery adhesive layers face challenges in achieving excellent adhesiveness and low-temperature output characteristics, with previous approaches either compromising adhesiveness or ion permeability when attempting to reduce viscosity for thin application.
Innovation Solution
A composition for a non-aqueous secondary battery adhesive layer is developed, comprising organic particles and a water-soluble polymer with specific viscosity ranges and monomer unit proportions, optimizing adhesiveness and low-temperature output characteristics by controlling viscosity and ion diffusivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the viscosity of the composition for an adhesive layer is lowered to enable thin application, then the adhesive layer thickness is reduced and cost is decreased, but the ion permeability of the adhesive layer is lost
Solution Approach 1:
The patent applies parameter changes by carefully controlling the viscosity of the adhesive composition within a specific range (100-1000 cP at 25°C) and adjusting the water-soluble polymer content (0.1-5 parts by mass relative to 100 parts by mass of organic particles). This optimized parameter range enables thin adhesive layer formation while preserving sufficient ion permeability, resolving the contradiction between thickness reduction and ion permeability maintenance.
2Volume of moving object
If the viscosity of the composition for an adhesive layer is lowered to enable thin application, then the adhesive layer thickness is reduced, but the adhesiveness of the adhesive layer is compromised
Solution Approach 1:
The patent employs composite materials by combining organic particles (such as acrylic resin particles) with water-soluble polymers (such as carboxymethyl cellulose, polyvinyl alcohol, or polyacrylic acid) in specific proportions. This composite formulation enables thin adhesive layer application while maintaining strong adhesiveness, as the synergistic combination of these materials provides both bonding strength and ion permeability even at reduced thickness.
3Productivity
If adhesive layer thickness is reduced to improve ion diffusivity, then cost is decreased, but adhesiveness and low-temperature output characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the viscosity of the adhesive composition to fall within 100-1000 cP at 25°C and controlling the water-soluble polymer content at 0.1-5 parts by mass relative to 100 parts by mass of organic particles. These parameter optimizations enable the formation of thin adhesive layers that maintain sufficient adhesiveness and low-temperature output characteristics while improving ion diffusivity.
Solution Approach 2:
The patent employs composite materials consisting of organic particles combined with specific water-soluble polymers (carboxymethyl cellulose, polyvinyl alcohol, or polyacrylic acid) in controlled proportions. This composite structure enables thin adhesive layers to retain adequate adhesiveness and low-temperature performance while achieving improved ion diffusivity, thus resolving the contradiction between thinness and functional performance.
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 composition forms an adhesive layer with enhanced adhesiveness and improved low-temperature output characteristics for non-aqueous secondary batteries, balancing adhesiveness and ion permeability effectively.
Implementation Method 1
a water-soluble polymer having a 1 mass% aqueous solution viscosity of at least 500 mPa·s and not more than 9,000 mPa·s
Implementation Method 2
integrating an electrode substrate including an electrode mixed material layer and a separator substrate through adhesion by an adhesive layer
Implementation Method 3
supplying, onto a suitable substrate such as an electrode substrate or a separator substrate, a composition for a non-aqueous secondary battery adhesive layer that is in the form of a slurry containing a binder component and a dispersion medium such as water, and then drying the composition for an adhesive layer
Data Source
AI summary
A composition for a non-aqueous secondary battery adhesive layer contains organic particles and a water-soluble polymer. The water-soluble polymer has a 1 mass% aqueous solution viscosity of at least 500 mPa·s and not more than 9,000 mPa·s. Viscosity η0 of the composition for a non-aqueous secondary battery adhesive layer at a shear rate of 100 s-1 is at least 10 mPa·s and not more than 200 mPa·s, and a ratio of η0 relative to viscosity η1 of the composition for a non-aqueous secondary battery adhesive layer at a shear rate of 10,000 s-1 is at least 1.5 and not more than 5.0.