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Labthink Instruments Co., Ltd.
Testing the Bond Strength Between Collector and Active Material in Lithium-Ion Battery Electrodes

Testing the Bond Strength Between Collector and Active Material in Lithium-Ion Battery Electrodes

Product catalog summary

Introduction
Lithium-ion batteries are prevalent in portable electronics and are being increasingly used in electric vehicles and large-scale energy storage. A critical aspect of their design is the bond strength between the current collector and the active material, which affects battery performance and lifespan.

Electrode Structure
The electrode consists of a current collector (aluminum for positive, copper for negative) coated with active material and a binder. During charge and discharge cycles, the active material expands and contracts, which can lead to separation from the collector if the bond is weak, increasing electrical resistance and reducing battery lifespan.

Testing Methodology
The bond strength is evaluated using a peel test with a Labthink C610H Tensile Tester. A rectangular electrode strip is prepared and secured to a stainless-steel plate. The test involves peeling the strip at a constant rate of 10 mm/minute, measuring the force required to separate the collector and active material. This force reflects the bond strength, with higher forces indicating stronger bonds.

Significance of Peel Test
The peel test simulates the shear stress at the collector-active material interface during battery operation. It provides insights into the mechanical integrity of the electrode, aiding in the development of batteries with longer lifespans and improved performance.

Conclusion
The peel test is a straightforward and effective method for assessing bond strength in lithium-ion battery electrodes. Labthink encourages collaboration with the packaging industry for quality control improvements. More information is available at www.labthink.com.

Catalog excerpts

Testing the Bond Strength Between Collector and Active Material in Lithium-Ion Battery Electrodes-1

Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 Testing the Bond Strength Between Collector and Active Material in Lithium-Ion Battery Electrodes Lithium-ion batteries are ubiquitous in portable electronics and are increasingly being explored for electric vehicles and large-scale energy storage. While the overall function of these batteries is well understood, the internal structure and its impact on performance are less familiar. This report focuses on a critical aspect of electrode design: the bonding strength between the current collector and the active material. A lithium-ion battery electrode consists of a current collector (aluminum for the positive electrode and copper for the negative) coated with a layer containing the active material and a binder. During charge and discharge cycles, lithium ions move between the electrodes. This process can cause the active material to expand and contract, potentially leading to separation from the current collector. Weak bonding at this interface increases electrical resistance and reduces battery lifespan. Therefore, ensuring a strong bond between the collector and active material is essential for optimal battery performance. Methods for evaluating the bonding strength between the collector and active material in a lithium-ion battery electrode include utilizing a standard tensile tester to carry out a peel test. In this study, a Labthink C610H Tensile Tester was used.

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Testing the Bond Strength Between Collector and Active Material in Lithium-Ion Battery Electrodes-2

Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 First prepare a sample, a rectangular electrode strip (1.9 cm wide) is secured to a stainlesssteel plate using double-sided adhesive tape. One end of the electrode strip is peeled from the steel plate. The peeled end and the opposite end are clamped into the upper and lower grips of the tensile tester, respectively. The test is automated and performed at a constant peel rate of 10 mm/minute. The force required to separate the collector and active material is continuously measured. Upon test completion, the instrument automatically...

Open the catalog to page 2

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