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Low-potential Prussian blue analogues for sodium-ion batteries: manganese hexacyanochromate

DOI: 10.1021/acs.chemmater.9b00471 DOI Help

Authors: Samuel Wheeler (University of Oxford) , Isaac Capone (University of Oxford) , Sarah Day (Diamond Light Source) , Chiu Tang (Diamond Light Source) , Mauro Pasta (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry Of Materials

State: Published (Approved)
Published: March 2019
Diamond Proposal Number(s): 14809

Abstract: Prussian blue analogues (PBAs) have recently shown outstanding electrochemical properties ascribable to their unique open-framework crystal structure that allows the reversible insertion of alkali ions with negligible perturbation to the framework itself. Many hexacyanoferrate materials have shown excellent properties and are some of the most promising sodium- and potassium-ion cathode materials in both aqueous and organic electrolytes. However, there is a distinct lack of candidate PBA materials that operate at low potentials, as their characteristic crystalline framework shows instability. In this article, we characterize the structure and electrochemical behavior of manganese hexacyanochromate, which exhibits reversible sodium insertion at −0.86 V vs standard hydrogen electrode (1.84 V vs Na+/Na) while maintaining the characteristic PBA cubic structure. This is the lowest redox potential of reported PBA materials and shows fast kinetics in a high-voltage water-in-salt electrolyte. Further reduction in potential in an organic electrolyte shows decomposition of the crystalline structure.

Diamond Keywords: Batteries; Sodium-ion; Potassium-ion

Subject Areas: Materials, Chemistry, Energy

Instruments: I11-High Resolution Powder Diffraction

Added On: 02/04/2019 10:25

Discipline Tags:

Physical Chemistry Energy Energy Storage Materials Science Energy Materials Chemistry

Technical Tags:

Diffraction X-ray Powder Diffraction