Wet Electrode Adhesion Measurement Under Electrolyte Immersion
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Solution Overview
Problem
Existing methods for measuring adhesion strength of electrodes in secondary batteries are limited, as they typically assess dry electrodes, whereas actual batteries have electrodes impregnated with an electrolyte solution, 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 a dried electrode is used for adhesion strength measurement, then the measurement process is simple, but the measurement accuracy does not reflect the actual battery conditions
Solution Approach 1:
The electrode specimen is impregnated with electrolyte solution before the adhesion strength measurement is performed. This preliminary action of wetting the electrode with electrolyte ensures that the measurement is conducted under conditions that closely resemble the actual battery operating state, thereby improving measurement accuracy without requiring complex in-situ battery testing equipment
Solution Approach 2:
An electrolyte solution is introduced as an intermediary medium between the electrode and the measurement environment. The electrolyte solution simulates the actual battery conditions by providing the same chemical and physical environment that the electrode experiences during operation, allowing accurate adhesion strength measurement without needing to measure inside the sealed battery
2Reliability
If an electrode specimen is impregnated with electrolyte solution for measurement, then the measurement reflects actual battery conditions, but the measurement process becomes more complex
Solution Approach 1:
The electrode specimen is pre-impregnated with electrolyte solution before measurement, which reliably simulates actual battery conditions. This preliminary wetting step ensures that the adhesion strength measurement reflects the true performance of the electrode in its operational state, improving evaluation reliability
Solution Approach 2:
The measurement system separates the electrolyte impregnation function from the adhesion strength measurement function. The fixing jig handles the electrolyte immersion while the measurement unit performs the peeling test, allowing each component to be optimized independently and simplifying the overall operation despite the added complexity of wet measurement
3Measurement precision
If the electrode mixture layer is peeled off to measure adhesion strength, then the adhesion strength can be quantified, but the electrode structure may be damaged
Solution Approach 1:
The peeling test is designed to peel only the electrode mixture layer from the current collector, not to destroy the current collector itself. By controlling the peeling force and measuring the force required to separate just the active material layer, the system achieves precise adhesion strength quantification while preserving the structural integrity of the underlying current collector for potential reuse or further analysis
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, thereby improving the evaluation of secondary battery preparation processability and performance.
Implementation Method 1
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
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. The adhesion strength measurement system includes: a test substrate; an electrode specimen attached to the test substrate; 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; and 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, the adhesion strength measurement unit including a grip part configured to grip one region of the electrode specimen.