Binder Distribution Measurement in Battery Electrodes
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Solution Overview
Problem
Current methods fail to accurately measure the distribution of a binder in secondary battery electrodes, particularly due to non-uniformity across the thickness, affecting adhesive strength and overall battery performance.
Innovation Solution
A method involving measuring the adhesive strength and thickness of electrodes by attaching and removing a removal tape, repeated until a measurement limit is reached, to determine the binder distribution accurately and uniformly across the electrode thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement methods are used to check binder distribution, then the measurement process is simple, but the measurement precision is insufficient to accurately detect non-uniformity across electrode thickness
Solution Approach 1:
The electrode thickness is divided into multiple measurement regions (first region near current collector, second region at intermediate thickness, third region near active material layer end). Adhesive strength is measured separately in each region to detect binder distribution non-uniformity that would be missed by conventional single-point measurements.
Solution Approach 2:
A test piece is introduced as an intermediary element that bonds to the electrode surface in each measurement region. The adhesive strength between the test piece and electrode serves as a mediator to indirectly measure binder distribution, converting an otherwise difficult-to-measure property into a quantifiable adhesive force.
2Measurement precision
If adhesive strength is measured at multiple regions to detect binder non-uniformity, then the measurement precision improves, but the measurement time increases
Solution Approach 1:
Test pieces are pre-prepared with predetermined adhesive properties before measurement. The bonding process between test pieces and electrode regions is performed systematically in advance according to a predetermined sequence, allowing parallel preparation and reducing overall measurement time while maintaining multi-region measurement precision.
3Manufacturing precision
If detailed multi-region adhesive strength measurements are performed, then the binder distribution uniformity can be accurately determined, but the manufacturing cost increases
Solution Approach 1:
Test pieces are designed as inexpensive, disposable components that bond to the electrode for measurement and are then discarded. This eliminates the need for complex, expensive reusable measurement apparatus while enabling detailed multi-region adhesive strength measurements to accurately determine binder distribution uniformity.
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 method allows for precise and cost-effective measurement of binder distribution, enhancing the uniformity and performance of secondary batteries by selecting electrodes with consistent adhesive strength across varying thicknesses.
Implementation Method 1
attaching a removal tape to the current collector of the electrode, and then measuring an adhesive strength of the removal tape while removing the removal tape
Data Source
AI summary
A method of the present invention includes measuring a thickness of an electrode in which an active material layer is formed on a current collector (Step 1); fixing the active material layer of the electrode to a substrate (Step 2); attaching a removal tape to the current collector of the electrode, and then measuring an adhesive strength of the removal tape and measuring a thickness of the electrode after the removal (Step 3); attaching a removal tape to the active material layer from which the current collector is removed, and then measuring an adhesive strength of the removal tape and measuring the thickness of the electrode after the removal, wherein this procedure is repeated until a measurement limit is reached (Step 4); and determining a distribution of a binder according to the thickness of the electrode from measured values obtained in Steps 3 and 4 (Step 5).