Detection of trapped molecular O2 in a charged Li-rich cathode by Neutron PDF

DOI: 10.1039/D1EE02237G

Authors: Robert A. House (University of Oxford; The Henry Royce Institute; The Faraday Institution) , Helen Y. Playford (ISIS Neutron and Muon Source) , Ronald I. Smith (ISIS Neutron and Muon Source) , Jennifer Holter (University of Oxford) , Ian Griffiths (University of Oxford) , Ke-Jin Zhou (Diamond Light Source) , Peter G. Bruce (University of Oxford; The Henry Royce Institute; The Faraday Institution)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Energy & Environmental Science , VOL 114

State: Published (Approved)
Published: December 2021
Diamond Proposal Number(s): 25589

Abstract: Oxidation and reduction of the oxide ions in the bulk of cathode materials is a potential route towards increasing the energy density of Li-ion batteries. Here, we present neutron PDF data which demonstrates the presence of short 1.2 Å O–O distances in a charged O-redox cathode material, corresponding to the bond length of molecular O2. This was achieved by collecting our data close to absolute zero (2 K), suppressing thermal motion which may have obscured detection by PDF previously. This direct detection of molecular O2 trapped in the material by diffraction complements the X-ray spectroscopy studies by e.g. RIXS while avoiding issues of possible beam damage as well as being a bulk average technique.

Diamond Keywords: Batteries; Lithium-ion

Subject Areas: Materials, Chemistry, Energy


Instruments: I21-Resonant Inelastic X-ray Scattering (RIXS)

Other Facilities: POLARIS at ISIS

Added On: 05/01/2022 08:44

Documents:
d1ee02237g.pdf

Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags:

Scattering Resonant Inelastic X-ray Scattering (RIXS)