Battery Functional Layer Composition for Heat Shrinkage Resistance
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Solution Overview
Problem
There is a demand for non-aqueous secondary batteries with improved heat shrinkage resistance and adhesiveness of functional layers after immersion in electrolyte solution to prevent short circuits and enhance cycle characteristics, especially in high-temperature environments.
Innovation Solution
A composition for a non-aqueous secondary battery functional layer containing first organic particles with a polyfunctional ethylenically unsaturated monomer unit in a specific proportion, second organic particles with a nitrile group-containing and cross-linkable monomer unit in specific proportions, and a solvent, which forms a functional layer with enhanced heat shrinkage resistance and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a functional layer is formed using conventional binder particles and filler particles, then the protective layer can be formed, but heat shrinkage resistance and adhesiveness deteriorate after immersion in electrolyte solution
Solution Approach 1:
The patent changes the chemical composition parameters of the binder particles by incorporating specific monomer units (carboxyl group-containing monomer units, hydroxyl group-containing monomer units, and epoxy group-containing monomer units) in controlled proportions. This chemical parameter modification enables the binder to maintain stable adhesiveness and heat shrinkage resistance after immersion in electrolyte solution, resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent creates a composite binder particle system combining multiple functional monomer units (carboxyl groups for chelation, hydroxyl groups for hydrogen bonding, epoxy groups for crosslinking) within a single binder matrix. This composite structure provides synergistic effects that simultaneously improve heat shrinkage resistance and maintain adhesiveness after electrolyte immersion, addressing the technical contradiction.
2Reliability
If the functional layer is designed for high heat shrinkage resistance, then short circuiting is prevented, but cycle characteristics deteriorate
Solution Approach 1:
The patent optimizes the proportional composition of multiple monomer units within the binder particles to achieve a balance between heat shrinkage resistance and cycle stability. By controlling the ratios of carboxyl group-containing, hydroxyl group-containing, and epoxy group-containing monomer units, the functional layer maintains dimensional stability at high temperatures while preserving good cycle characteristics.
3Ease of manufacture
If the functional layer uses simple binder composition, then manufacturing is easier, but adhesiveness between battery components deteriorates
Solution Approach 1:
The patent employs composite binder particles containing multiple types of monomer units with different functional groups (carboxyl, hydroxyl, epoxy) that work synergistically. This composite approach enhances adhesiveness between battery components through multiple interaction mechanisms while maintaining reasonable manufacturing complexity.
Solution Approach 2:
The patent introduces different functional groups at specific locations within the binder particle structure, allowing different regions of the binder to interact with different battery components through specific mechanisms (chelation, hydrogen bonding, crosslinking), thereby enhancing overall adhesiveness without requiring complete compositional complexity throughout the entire material.
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 functional layer exhibits excellent heat shrinkage resistance and adhesiveness, leading to improved cycle characteristics and safety of non-aqueous secondary batteries by preventing short circuits and maintaining performance in high-temperature conditions.
Implementation Method 1
first organic particles including a polyfunctional ethylenically unsaturated monomer unit in a proportion of not less than 20 mass % and not more than 90 mass %
Implementation Method 2
second organic particles including a cross-linkable monomer unit in a proportion of not less than 0.1 mass % and not more than 10 mass %
Implementation Method 3
second organic particles including a nitrile group-containing monomer unit in a proportion of not less than 20 mass % and not more than 80 mass %
Implementation Method 4
heat shrinkage resistance after immersion in electrolyte solution
Data Source
AI summary
Provided is a composition for a non-aqueous secondary battery functional layer with which it is possible to form a functional layer that has excellent heat shrinkage resistance and adhesiveness after immersion in electrolyte solution and that can cause a non-aqueous secondary battery to display excellent cycle characteristics. The composition for a functional layer contains first organic particles, second organic particles, and a solvent. The first organic particles include a polyfunctional ethylenically unsaturated monomer unit in a proportion of not less than 20 mass % and not more than 90 mass %. The second organic particles include a nitrile group-containing monomer unit in a proportion of not less than 20 mass % and not more than 80 mass % and a cross-linkable monomer unit in a proportion of not less than 0.1 mass % and not more than 10 mass %.