White PaperTest & Measurement
Structural Characterization of Carbon Black Paste for Li-ion Battery Electrodes Using Simultaneous Rheology and Electrochemical Impedance Spectroscopy
SPONSORED BY: ![]()
Carbon black is typically used as a conductive additive in lithium-ion battery electrodes. Electrical conductivity of the carbon black structure may affect the electrode and battery performance. The fine carbon particles tend to aggregate with each other and form a network-like structure in the paste. To obtain information about the conductive structure, the rheological and electrochemical properties of pastes were investigated in carbon black pastes using TA Instruments™ Discovery™ Hybrid Rheometer with a dielectric accessory and an impedance analyzer. Simultaneous measurements of rheology and electrochemical impedance were performed under applied oscillatory shear. It was found that large deformation of the paste causes collapse of the network-like structure, impacting both its rheological and conductive properties. Continue reading this enlightening Application Note to learn more about how this valuable information can help you improve the final battery performance.
Don't have an account?
Overview
This white paper investigates the rheological and electrochemical properties of carbon black (CB) pastes used in lithium-ion battery (LIB) electrodes, focusing on how these properties affect battery performance. The study compares two types of pastes: one containing only CB and solvent (Paste A) and another that includes a polyvinylidene fluoride (PVDF) binder (Paste B). The research employs simultaneous rheological measurements and electrochemical impedance spectroscopy (EIS) to analyze the impact of shear on the conductive structure of the pastes.
Key findings reveal that the presence of CB significantly enhances the storage modulus (G’) of the pastes compared to a control solution of PVDF and solvent, indicating a quasi-solid property and the formation of network-like structures. Paste A exhibits a higher G’ than Paste B, suggesting that the PVDF binder may inhibit the aggregation of CB particles. EIS results show that the overall resistance of the CB pastes is lower than that of the control, with Paste B having a slightly higher resistance due to the binder's presence.
The study concludes that understanding the interplay between rheological behavior and electrochemical properties is crucial for optimizing the performance of LIB electrodes, as the structural integrity of the conductive network directly influences battery efficiency. This research contributes valuable insights into the formulation of electrode materials for improved lithium-ion battery applications.