Functional Layer for Non-Aqueous Secondary Battery
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Solution Overview
Problem
Conventional functional layers in non-aqueous secondary batteries, particularly those made from heat-resistant resins like aramid, suffer from high water content due to chloride ions, leading to warping and deterioration of battery characteristics, and lack sufficient adhesion between components.
Innovation Solution
Incorporating an acidic group-containing polymer with a specific range of chlorine atom content (0.001-2.000 mass %) into the functional layer, which reduces water content and enhances adhesion, while using a heat-resistant resin like aramid for improved heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a functional layer is formed from a heat resistant resin such as aramid resin, then heat resistance is improved and heat shrinkage is inhibited, but water content increases due to chloride ions forming metal chloride that undergoes deliquescence
Solution Approach 1:
The patent applies parameter changes by controlling the chlorine atom content within a specific range (0.001-2.000 mass %) and adjusting the acidic group content (0.01-3.00 mmol/g) to optimize the balance between heat resistance and water content. This quantitative control resolves the contradiction by finding the optimal parameter values that satisfy both requirements simultaneously.
Solution Approach 2:
The patent uses composite materials by combining heat resistant resin with acidic group-containing polymer in a functional layer. This composite structure allows the heat resistant resin to provide thermal stability while the acidic group-containing polymer captures metal ions and reduces water content through deliquescence inhibition, thus resolving the contradiction between heat resistance and water content.
2Ease of manufacture
If a functional layer with high water content is used, then the functional layer can be formed from conventional heat resistant resins, but warping of battery components occurs and battery characteristics deteriorate
Solution Approach 1:
The patent controls water content by adjusting the chlorine atom content to 0.001-2.000 mass % and acidic group content to 0.01-3.00 mmol/g. This parameter optimization prevents excessive water accumulation that causes warping, while still allowing the functional layer to be manufactured using conventional processes, thus resolving the contradiction between manufacturability and dimensional stability.
3Temperature
If heat resistant resins such as aramid resins are used, then heat resistance is improved, but thermoplasticity is poor and binding capacity is insufficient, making adhesion between battery components difficult
Solution Approach 1:
The patent creates a composite functional layer combining heat resistant resin with acidic group-containing polymer. The acidic group-containing polymer provides thermoplasticity and binding capacity that the heat resistant resin lacks, while the heat resistant resin maintains thermal stability. This composite approach resolves the contradiction between heat resistance and adhesion strength.
Solution Approach 2:
The patent optimizes the composition parameters by controlling the ratio and content of heat resistant resin and acidic group-containing polymer, adjusting chlorine atom content to 0.001-2.000 mass %, and acidic group content to 0.01-3.00 mmol/g. These parameter adjustments enable the functional layer to achieve both high heat resistance and sufficient adhesion strength.
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 achieves low water content, excellent heat resistance, and strong adhesion, ensuring battery safety and performance by capturing metal ions and forming a solid electrolyte interface, thereby inhibiting warping and improving high-temperature storage characteristics.
Implementation Method 1
chloride ions that are imported into the functional layer by the heat resistant resin and/or other components (hereinafter, also referred to simply as a 'heat resistant resin or the like') forming a metal chloride that then undergoes deliquescence
Implementation Method 2
an acidic group-containing polymer... reducing water content of the functional layer
Data Source
AI summary
Provided is a functional layer for a non-aqueous secondary battery having reduced water content and excellent heat resistance and adhesiveness. The functional layer for a non-aqueous secondary battery contains a heat resistant resin and an acidic group-containing polymer. The percentage content of chlorine atoms in the functional layer for a non-aqueous secondary battery as measured by combustion ion chromatography is not less than 0.001 mass % and not more than 2.000 mass %.