Wet-State Adhesion Measurement for Battery Electrode-Separator Interfaces
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Solution Overview
Problem
Existing methods for measuring interfacial adhesion between electrodes and separators in secondary batteries are inadequate, as they either measure adhesion in a dry state or suffer from electrolyte volatilization issues when measuring in a wet state, leading to inaccurate results.
Innovation Solution
A device comprising a fixing jig and an adhesion strength meter that immerses a measurement specimen in an electrolyte to simulate the conditions inside a secondary battery, allowing for the measurement of interfacial adhesion between electrodes and separators in a wet state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If adhesion measurement is performed in a dry state using conventional methods, then the measurement can be conducted easily, but the measurement results do not reflect the actual adhesion conditions inside the battery
Solution Approach 1:
The patent introduces an electrolyte solution as an intermediary medium to create a wet measurement environment that simulates actual battery conditions. The electrolyte solution allows the measurement to be performed on electrode assemblies that have been disassembled but still maintain their adhesion characteristics as if they were inside the battery, thereby resolving the contradiction between ease of measurement and measurement accuracy.
2Measurement precision
If adhesion measurement is performed in a wet state by disassembling the battery, then the measurement reflects actual battery conditions, but the electrolyte impregnated in the electrode and separator volatilizes during measurement time
Solution Approach 1:
The patent applies preliminary action by immersing the disassembled electrode assembly in electrolyte solution before measurement and maintaining it in this state throughout the measurement process. This preliminary preparation ensures that the electrode and separator remain saturated with electrolyte, preventing volatilization losses and maintaining accurate adhesion measurement conditions.
3Strength
If lamination or heat pressing is performed to increase adhesion between electrode and separator, then adhesion is improved, but excessive drying causes lithium plating on the negative electrode
Solution Approach 1:
The patent replaces the mechanical/thermal processing methods (lamination and heat pressing) with a chemical/electrochemical approach by using electrolyte solution immersion. This substitution maintains adhesion between the electrode and separator through electrolyte saturation without causing lithium plating, thereby resolving the contradiction between improving adhesion strength and avoiding harmful side effects.
Data Source
AI summary
An adhesion measuring device measures an interfacial adhesion between an electrode and a separator, and a method for measuring adhesion using the same, has the advantage of measuring an interfacial adhesion between an electrode and a separator impregnated with an electrolyte that simulates a condition equivalent to a condition in an actual secondary battery, thereby predicting the adhesion of the electrode and the separator in the actual secondary battery and preventing folding of the separator, etc.