Aqueous Vinylidene Fluoride Polymer Composition Adhesion
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Solution Overview
Problem
Conventional vinylidene fluoride-based polymer compositions for non-aqueous electrolyte secondary batteries exhibit poor adhesiveness between the current collector and the mixture layer, limiting the reliability of the batteries.
Innovation Solution
An aqueous vinylidene fluoride-based polymer composition with a multi-modal scattering intensity distribution, comprising components with particle sizes less than 1 µm and exceeding 1 µm, and an integrated scattering intensity distribution frequency range of 70.0 to 98.7%, is used, along with a thickener, to enhance adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous dispersion of vinylidene fluoride-based polymer is used, then environmental burden is reduced, but adhesiveness between current collector and mixture layer remains poor
Solution Approach 1:
The patent resolves this contradiction by optimizing the particle size distribution parameters of the aqueous dispersion (D10: 0.3-2.0 μm, D50: 3.0-10.0 μm, D90: 10.0-30.0 μm) and setting the volume ratio of larger particles (≥1 μm) to 10-80%. This enables the aqueous dispersion to achieve both environmental friendliness and sufficient adhesiveness.
Solution Approach 2:
The patent combines aqueous dispersion of vinylidene fluoride-based polymer with thickeners to create a composite binder solution. This composite material approach maintains the environmental advantages of aqueous dispersion while achieving the required adhesiveness through the synergistic effect of the polymer particles and thickener.
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 provides electrodes with excellent adhesive strength between the current collector and the mixture layer, thereby improving the reliability and performance of non-aqueous electrolyte secondary batteries.
Implementation Method 1
the vinylidene fluoride-based polymer exhibiting a multi-modal scattering intensity distribution in dynamic light scattering in a measurement range of from 1.0 to 999,999.9 nm
Data Source
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AI summary
An object of the present invention is to provide an aqueous vinylidene fluoride-based polymer composition capable of providing a mixture for a non-aqueous electrolyte secondary battery exhibiting excellent adhesive strength with a current collector, wherein the aqueous vinylidene fluoride-based polymer composition of the present invention comprises a vinylidene fluoride-based polymer and water; the vinylidene fluoride-based polymer exhibits a multi-modal scattering intensity distribution in dynamic light scattering; the vinylidene fluoride-based polymer comprises a component A having a particle size of not greater than 1 µm in a scattering intensity distribution and a component B having a particle size exceeding 1 µm; the D50 of component A is from 0.02 to 0.5 µm; the D50 of component B is from 1.1 to 50 µm; and the integrated value of a scattering intensity distribution frequency in a particle size range of from 1.0 to 1000.0 nm is in a range of from 70.0 to 98.7%.