Battery Functional Layer Composition for Adhesion Without Electrolyte Loss
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Solution Overview
Problem
Non-aqueous secondary batteries face challenges in achieving improved adhesiveness, life properties, and low-temperature output properties, with existing functional layers often experiencing insufficient electrolyte distribution and handling difficulties due to blocking issues.
Innovation Solution
A composition for a non-aqueous secondary battery functional layer is developed, comprising a particulate polymer with specific monomer unit ratios, particle diameters, and swelling degrees, along with inorganic particles, to enhance adhesiveness and prevent blocking, while maintaining effective electrolyte supply and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the functional layer contains a particulate polymer with high adhesiveness, then the adhesion between separator substrate and electrode is improved, but the liquid supply to the electrode becomes insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (20°C or higher), particle diameter (0.5-5 μm), and swelling degree (1-3 times) of the particulate polymer. These parameter optimizations enable the polymer to achieve high adhesiveness while maintaining appropriate porosity and electrolyte wettability, thus preventing insufficient liquid supply to the electrode.
Solution Approach 2:
The patent uses composite materials by combining the particulate polymer with specific inorganic particles (such as alumina, silica, or titania) having particle diameters of 0.1-10 μm. This composite structure enhances both the adhesiveness and the electrolyte distribution properties, resolving the contradiction between strong adhesion and adequate liquid supply.
2Strength
If the functional layer has high adhesiveness, then the adhesion between separator substrate and electrode is improved, but the handling becomes difficult due to blocking
Solution Approach 1:
The patent resolves the handling issue by optimizing the glass transition temperature of the particulate polymer to be 20°C or higher. This parameter change ensures that the polymer remains sufficiently rigid at room temperature to prevent blocking and facilitate handling, while still achieving high adhesiveness under pressing conditions during battery assembly.
Solution Approach 2:
The patent applies preliminary action by controlling the particle diameter of the particulate polymer to be 0.5-5 μm before assembly. This size control prevents excessive interlocking and blocking during handling while ensuring sufficient adhesion strength is achieved when the layers are pressed together during battery manufacturing.
3Strength
If the functional layer provides high adhesiveness, then the adhesion between separator substrate and electrode is improved, but the life properties and low-temperature output properties decrease
Solution Approach 1:
The patent applies parameter changes by optimizing the swelling degree of the particulate polymer to be 1-3 times. This controlled swelling ensures that the functional layer maintains adequate porosity for electrolyte penetration, which is critical for maintaining life properties and low-temperature output properties while still achieving high adhesiveness.
Solution Approach 2:
The patent uses composite materials by incorporating inorganic particles with specific properties (particle diameter 0.1-10 μm, high thermal stability) into the functional layer. This composite structure enhances the thermal and mechanical stability of the adhesive layer, improving life properties and low-temperature performance while maintaining strong adhesion.
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 results in a functional layer with high adhesiveness, improved life and low-temperature output properties, and facilitated handleability, enhancing the overall performance of non-aqueous secondary batteries.
Implementation Method 1
a swelling degree of the particulate polymer to an electrolyte solution is more than 1 time and 3 times or less
Data Source
AI summary
A composition for a non-aqueous secondary battery functional layer including a particulate polymer, wherein the particulate polymer is a copolymer containing 20% by weight or more and 80% by weight or less of an aromatic monovinyl monomer unit; and 0.01% by weight or more and 2% by weight or less of a polyvalent ethylenically unsaturated crosslinkable monomer unit, a volume-average particle diameter D of the particulate polymer is 0.5 µm or more and 5 µm or less, and a swelling degree of the particulate polymer to an electrolyte solution is more than 1 time and 3 times or less; and a non-aqueous secondary battery including the same.