Measuring the Bulk Density of Graphite Powder

User Benefits

－ Bulk density, an important property of battery materials for improving battery performance can be measured. － By using a precision universal testing machine, bulk density can be evaluated over a wide load range, from low to high.

Introduction

The lithium-ion battery (LiB) market is expected to expand further in the future as countries around the world promote the transition to electric vehicles with the aim of carbon neutrality and as demand for smartphones, tablet devices,etc. increases. The coating technology for current collectors greatly affects the characteristics of batteries in the LiB manufacturing process. When manufacturing LiB electrodes, active materials are mixed with a binder and solvent, applied to a current collector, dried, and then pressed to increase packing density. It is believed that the thickness and mass of electrodes affect the energy density of LiBs, with thicker coatings resulting in larger battery capacities and lower rate characteristics. Conversely, thinner coatings result in better rate characteristics but smaller battery capacities. To improve the volumetric energy density of LiBs, it is important to improve the filling properties of the positive and negative electrode active materials and increase the density of the electrodes. Therefore, evaluation of the density of positive and negative electrode materials is important for improving the characteristics of batteries and achieving the desired battery performance. To satisfy the pressure conditions of the manufacturing process, the measurements need to cover the density changes of powder samples continuously from low to high pressures. This article introduces an example of evaluating the bulk density of graphite powder that is used as an anode material using the AGX-V2 precision universal testing machine.

20 de marzo de 2024 GMT