Hioki RM2610: Accurate resistance analysis in lithium-ion battery electrodes
The Hioki RM2610 electrode resistance measurement system has been designed to meet a fundamental need in lithium-ion battery research and production: the accurate quantification of resistances invisible to the naked eye within electrode sheets. It isolates two distinct but interdependent components: the resistivity of the composite layer and the interface resistance between it and the current collector. These parameters, when poorly understood or poorly controlled, can limit the overall performance of batteries, particularly in terms of power, life and energy efficiency.
The RM2610 works on the basis of inverse problem analysis using the finite volume method. This approach involves applying a constant current to the electrode sheet, measuring the surface potential distribution at several points, and then adjusting a computer model until the measured and calculated potentials match. The values obtained for composite resistivity and interface resistance are thus derived iteratively and robustly, offering a high degree of reliability.
The device is capable of measuring multiple locations on the same sheet, allowing the uniformity of resistance across the entire surface to be verified. This is particularly useful for comparative analysis of materials or processes. The RM2610 can also be used to evaluate the impact of parameters such as electrode density, the composition of conductive additives, or the presence of a carbon coating on the collector sheets.
This system plays a key role in the research and development phase of lithium-ion batteries, enabling the optimisation of electrode formulations and improving overall electrochemical performance. The RM2610 is therefore an essential diagnostic tool for quality control, comparative sample analysis and electrode characterisation.
