Diamond Publications - Search Results

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

One item found (0 items not approved).

Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Improving capacity retention of Li2VO2F Li-rich cathodes with film-forming additives Ida Kallquist , Jean-Frederic Martin , Andrew Naylor , Christian Baur , Maximilian Fichtner , Jean-Francois Colin , Daniel Brandell , Kristina Edstrom , Maria Hahlin The Journal Of Physical Chemistry C DOI: 10.1021/acs.jpcc.0c02840 Diamond Proposal Number(s): [20870] Show Abstract ▼ Abstract: Li-rich disordered rock-salt structures have due to their high theoretical capacity gained large attention as a promising class of cathode materials for battery applications. However, the cycling stability of these materials have so far been less satisfactory. Here, we present three different film forming electrolyte additives; lithium bis(oxalato)borate (LiBOB), lithium difluoro(oxalato)borate (LiODFB), and glycolide, which all improve the cycling performance of the high capacity Li-rich disordered rock-salt material Li2VO2F. The best performing additive, LiODFB, show a 12.5% increase of capacity retention after 20 cycles. The improved cycling performance is explained by the formation of a more robust cathode interphase on the electrode surface. Photoelectron spectroscopy is used to show that the surface layer is created from oxidation of the electrolyte salt and additive co-salts. This passivating layer can mitigate oxidation and following degradation of the active material, and thus a higher degree of redox active vanadium can be maintained after 20 cycles.	May 2020

Instruments / Technical Area

Publication Details

Published

Actions

I09-Surface and Interface Structural Analysis

Improving capacity retention of Li2VO2F Li-rich cathodes with film-forming additives

Ida Kallquist , Jean-Frederic Martin , Andrew Naylor , Christian Baur , Maximilian Fichtner , Jean-Francois Colin , Daniel Brandell , Kristina Edstrom , Maria Hahlin

The Journal Of Physical Chemistry C

DOI: 10.1021/acs.jpcc.0c02840

Diamond Proposal Number(s): [20870]

Show Abstract ▼

May 2020