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Reversible densification in nano-Li 2 MnO 3 cation disordered rock-salt Li-ion battery cathodes

DOI: 10.1039/D0TA03372C DOI Help

Authors: Maria Diaz-Lopez (ISIS Facility; Diamond Light Source) , Philip A. Chater (Diamond Light Source) , Yves Joly (Grenoble Alpes Univ., CNRS, Inst. Neel) , Olivier Proux (Grenoble Alpes Univ., CNRS, Inst. Neel) , Jean-Louis Hazemann (Grenoble Alpes Univ., CNRS, Inst. Neel) , Pierre Bordet (Grenoble Alpes Univ., CNRS, Inst. Neel) , Valerie Pralong (Normandie Univ., Ensicaen, Unicaen, CNRS, Crismat)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry A , VOL 69

State: Published (Approved)
Published: May 2020
Diamond Proposal Number(s): 20893 , 20094

Open Access Open Access

Abstract: The full structure of nano-Li2MnO3 with superior reversible capacities of 290 mA h g−1 for over 10 cycles was investigated by neutron and X-ray total scattering, which demonstrate that contrary to previous claims, a phase transformation occurs during synthesis forming a disordered cubic MnO-type rock-salt with nanodomains of Li/Mn layering of ∼1 nm. A comprehensive study of the structural and charge evolution combining in operando X-ray total scattering with advanced spectroscopic methods at the Mn K-edge such as High Energy Resolved Fluorescence Detected XANES, EXAFS and Emission Spectroscopies including main and valence-to-core transitions, point to a lattice densification with an effective loss of Li2O, with the subsequent electrochemical activation of Li2O as the main responsible mechanism for the exchanged capacity. Interestingly, and unlike previous studies, no capacity losses could be associated to the material's densification.

Diamond Keywords: Batteries; Lithium-ion

Subject Areas: Materials, Chemistry, Energy

Instruments: I15-1-X-ray Pair Distribution Function (XPDF)

Other Facilities: GALAXIES-Soleil

Added On: 27/05/2020 09:15


Discipline Tags:

Physical Chemistry Energy Energy Storage Materials Science Energy Materials Chemistry

Technical Tags:

Scattering Pair Distribution Function (PDF) Total Scattering