Graphite Electrode bulk density is one of the key testwork parameters that impacts the performance of graphitic electrodes. The higher the density, the tighter the graphite flake packing. This tight packing increases electron connectivity on the surface and improves electrical resistance. This is why graphite that has a high bulk density will typically have a higher electrical conductivity than material with a lower bulk density. Graphite Electrode bulk densities are reported on most graphite specification sheets.
A high Graphite Electrode Bulk Density is also indicative of a successful electrode forming process. This is because the process of electrode forming affects the porosity, which impacts the conductivity. It is therefore important to screen graphite for quality and select the best graphite for your application.
The highest quality natural graphite (SL20) is a fine-grain, high-density material with a bulk density of 2.64 g/cm3. This material is ideal for use as an electrode material in reversible lithium batteries because it provides the lowest voltage profile and optimum reversible capacity.
During the battery manufacturing process, the SL20 electrodes are pressed to form the required size and shape. The pressing process is also used to determine the Graphite-Electrode bulk density. During reversible cycling, the electrodes can be subjected high temperatures and mechanical stresses that can lead to degradation. In order to monitor electrode degradation, it is important to measure Graphite Electrode density before and following the reversible cycle.
A high Graphite-Electricity bulk density for anode application is crucial because it results in a larger first-cycle reversible capability and improved cycling performances. In addition, the ICL - or internal current limitation - of the electrolyte is also determined by its density.
In two-electron orr, it was found that high-density GF electrodes had the highest ICL as well as cycling performance in comparison to RVC and nonporous BDD. This is because the GF cathodes have a larger reactive surface and faster oxygen diffusion.
The ICL for GF electrodes can be improved by adding carbon nanotubes. Recently, Chu et al. (2017) demonstrated the GF/MWCNT Composite had the greatest ORR electrocatalytical activity and H2O2 Yield compared to a CF pure cathode. This is because the porous GF/MWCNT electrodes have a better oxygen diffusion and a faster reversible cycling. This is an important finding that could potentially boost the performance of GF as an anode material in rechargeable lithium-ion batteries. The GF/MWCNT Nanocomposite also has a great deal of potential as a material that is anti-corrosive for automotive fuel cell.
English
Write a Message