The Battery Experts video series with Anthony Chalou from Anton Paar explores the crucial measurement of solid density in powder electrode materials for lithium-ion batteries.
In this video, Anthony explains the importance of two fundamental density values: Tap density and true (skeletal) density, and how they influence the quality and performance of electrode powders and battery slurries.
Tap density, also known as bulk or packing density, includes the volume of the solid phase, spaces between particles, and pores within particles. It directly affects the efficiency and energy management of a battery cell.
The measurement involves weighing a sample in a graduated cylinder, tapping it to a packed state, and recording the volume to determine the density.
True density, or skeletal density, is an inherent physical property independent of particle size, shape, or compaction. It remains constant over time and is measured using gas pycnometry.
This technique involves measuring gas volume differentials before and after expansion into an empty reference chamber. Helium is typically used due to its ideal gas properties and small atomic size.
Anthony details the process of setting up and conducting these measurements, from sample preparation and weighing to inputting parameters in the software and interpreting the results.
Accurately measuring these density parameters ensures proper characterization of electrode materials, ultimately predicting and enhancing the performance of the final battery cell.
The Battery Experts: The Impact of Solid Density on Battery Performance | Anton Paar
Video Credit: Anton Paar GmbH
This information has been sourced, reviewed and adapted from materials provided by Anton Paar GmbH.
For more information on this source, please visit Anton Paar GmbH.