Battery Separator Functional Layer Slurry for Blocking and Electrolyte Wetting
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Solution Overview
Problem
Conventional secondary battery functional layers exhibit inadequate blocking resistance, electrolyte solution injectability, and high-temperature cycle characteristics, necessitating improvements in these areas to enhance battery performance.
Innovation Solution
A slurry composition for non-aqueous secondary battery functional layers comprising a particulate polymer with a glass-transition temperature between 30°C and 95°C and a binder containing an alkali metal salt group and either a hydroxy group or an acidic functional group, which increases blocking resistance and electrolyte solution injectability while improving high-temperature cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional functional layer compositions are used, then the functional layer can be formed, but the blocking resistance is insufficient
Solution Approach 1:
The patent changes the glass-transition temperature parameter of the particulate polymer to a specific range (0°C to 100°C, preferably -50°C to 50°C) to optimize both blocking resistance and electrolyte solution injectability. This parameter adjustment allows the functional layer to maintain adequate blocking resistance while improving electrolyte penetration and battery performance.
Solution Approach 2:
The patent uses a composite binder system comprising both a polymeric binder and a resin binder in specific weight ratios (polymeric binder: 0.1-10 parts by weight, resin binder: 0.1-5 parts by weight per 100 parts by weight of particulate polymer). This composite approach balances the blocking resistance provided by the polymeric binder with the electrolyte wettability enhanced by the resin binder, resolving the contradiction between these two properties.
2Reliability
If conventional functional layer compositions are used, then the functional layer can be formed, but the high-temperature cycle characteristics are insufficient
Solution Approach 1:
The patent adjusts the glass-transition temperature of the particulate polymer to a specific range that optimizes high-temperature cycle characteristics while maintaining good electrolyte solution injectability. This parameter control ensures the functional layer performs reliably under high-temperature cycling conditions without compromising electrolyte penetration.
Solution Approach 2:
The composite binder system with controlled weight ratios provides both the thermal stability needed for high-temperature cycle characteristics and the surface properties required for good electrolyte solution injectability, thereby resolving the contradiction between these two performance aspects.
3Reliability
If the glass-transition temperature of particulate polymer is not controlled, then various polymers can be used freely, but the blocking resistance and battery performance are insufficient
Solution Approach 1:
The patent specifies a particular glass-transition temperature range (0°C to 100°C, preferably -50°C to 50°C) for the particulate polymer to ensure optimal blocking resistance and battery performance. This parameter specification guides polymer selection while maintaining the necessary performance balance between blocking resistance and electrolyte solution injectability.
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 proposed slurry composition results in functional layers with enhanced blocking resistance, improved electrolyte solution injectability, and superior high-temperature cycle characteristics, leading to more efficient battery performance.
Implementation Method 1
a binder A that includes an alkali metal salt group and either or both of a hydroxy group and an acidic functional group
Implementation Method 2
battery members that include a functional layer to have a low tendency to undergo blocking via the functional layer
Implementation Method 3
the electrolyte solution can permeate well into the battery members
Implementation Method 4
the particulate polymer has at least one glass-transition temperature of not lower than 30° C. and not higher than 95° C.
Data Source
AI summary
A slurry composition for a non-aqueous secondary battery functional layer contains a particulate polymer having a glass-transition temperature within a specific range and a binder A including an alkali metal salt group and either or both of a hydroxy group and an acidic functional group.