Wet Electrode Adhesion Testing Under Electrolyte Immersion
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Solution Overview
Problem
Existing methods for measuring adhesion strength of electrodes in secondary batteries are inadequate as they typically assess dry electrodes, whereas actual batteries have electrodes impregnated with electrolyte solutions, necessitating a method to simulate the wet state for accurate evaluation.
Innovation Solution
An adhesion strength measurement system and method for wet electrode specimens, which includes a test substrate, a fixing jig to immerse the electrode specimen in an electrolyte solution, and an adhesion strength measurement unit to apply a tensile force and measure the peeling force of the electrode specimen's mixture layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adhesion strength is measured using a dried electrode, then the measurement process is simple and fast, but the measurement does not reflect the actual adhesion strength in the wet state inside the battery
Solution Approach 1:
The electrode specimen is pre-impregnated with electrolyte solution before adhesion strength measurement. This preliminary action of wetting the electrode with electrolyte ensures that the measurement reflects the actual adhesion conditions inside the battery, where electrodes operate in a wet state. The fixing jig is prepared with electrolyte solution in advance, and the specimen is immersed before the peeling test begins.
Solution Approach 2:
The fixing jig acts as an intermediary device that maintains the electrolyte environment during measurement. It holds the electrolyte solution and positions the electrode specimen within it, creating a controlled wet environment that simulates actual battery conditions. This intermediary structure enables accurate wet-state adhesion measurement without requiring complex battery disassembly.
2Reliability
If the electrode specimen is impregnated with electrolyte solution before measurement, then the measurement reflects actual battery conditions, but the measurement process becomes more complex and time-consuming
Solution Approach 1:
The electrode specimen is pre-impregnated with electrolyte solution before adhesion strength measurement. This preliminary action of wetting the electrode with electrolyte ensures that the measurement reflects the actual adhesion conditions inside the battery, where electrodes operate in a wet state. The fixing jig is prepared with electrolyte solution in advance, and the specimen is immersed before the peeling test begins.
Solution Approach 2:
The fixing jig serves multiple functions: it holds the electrolyte solution, positions the electrode specimen, provides mechanical support during peeling, and maintains the wet environment throughout measurement. This multi-functional design consolidates several operations into one device, reducing overall process complexity and time.
3Measurement precision
If a fixing jig with recessed portion is used to hold electrolyte solution, then the electrode specimen can be properly immersed and fixed, but the device structure becomes more complex
Solution Approach 1:
The fixing jig features a recessed portion specifically designed to hold electrolyte solution at the exact location where the electrode specimen needs to be immersed. This localized structure provides precise immersion depth control without requiring complex mechanisms throughout the entire device. The recessed portion is strategically positioned to ensure the electrode mixture layer is fully submerged while keeping the rest of the jig structure simple.
Solution Approach 2:
The recessed portion in the fixing jig replicates the essential feature of a container holding electrolyte, simplifying the overall design by incorporating only the necessary geometric feature rather than using a separate complex immersion tank. This copied functional element achieves precise immersion control with minimal structural complexity.
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
This system allows for the simulation of an electrode's actual state in a secondary battery, enabling accurate measurement of adhesion strength under wet conditions, thereby improving the reliability of secondary battery performance evaluation.
Implementation Method 1
a fixing jig configured to fix the test substrate so that the electrode specimen attached to the test substrate is immersed in an electrolyte solution
Implementation Method 2
an adhesion strength measurement unit configured to measure a force at which a mixture layer of the electrode specimen is peeled off by applying a tensile force to the gripped electrode specimen
Data Source
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AI summary
The present technology relates to an adhesion strength measurement system for a wet electrode specimen that can evaluate the adhesion strength of an electrode specimen impregnated with an electrolyte solution, and an adhesion strength measurement method for a wet electrode specimen using the same.