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Li2O:Li–Mn–O disordered rock‐salt nanocomposites as cathode prelithiation additives for high‐energy density Li‐ion batteries
Authors:
Maria
Diaz-Lopez
(ISIS Facility; Diamond Light Source)
,
Philip A.
Chater
(Diamond Light Source)
,
Pierre
Bordet
(Institut Néel, CNRS)
,
Melanie
Freire
(SAFT; Crismat, CNRS, Unicaen, Ensicaen, Normandie Université)
,
Christian
Jordy
(SAFT)
,
Oleg I.
Lebedev
(Crismat, CNRS, Unicaen, Ensicaen, Normandie Université)
,
Valerie
Pralong
(Crismat, CNRS, Unicaen, Ensicaen, Normandie Université)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Advanced Energy Materials
, VOL 142
State:
Published (Approved)
Published:
January 2020
Diamond Proposal Number(s):
20893

Abstract: The irreversible loss of lithium from the cathode material during the first cycles of rechargeable Li‐ion batteries notably reduces the overall cell capacity. Here, a new family of sacrificial cathode additives based on Li2O:Li2/3Mn1/3O5/6 composites synthesized by mechanochemical alloying is reported. These nanocomposites display record (but irreversible) capacities within the Li–Mn–O systems studied, of up to 1157 mAh g−1, which represents an increase of over 300% of the originally reported capacity in Li2/3Mn1/3O5/6 disordered rock salts. Such a high irreversible capacity is achieved by the reaction between Li2O and Li2/3Mn1/3O5/6 during the first charge, where electrochemically active Li2O acts as a Li+ donor. A 13% increase of the LiFePO4 and LiCoO2 first charge gravimetric capacities is demonstrated by the addition of only 2 wt% of the nanosized composite in the cathode mixture. This result shows the great potential of these newly discovered sacrificial additives to counteract initial losses of Li+ ions and improve battery performance.
Journal Keywords: cation‐disordered rock salts; initial capacity losses; Li4Mn2O5; lithium batteries; sacrificials
Diamond Keywords: Batteries; Lithium-ion
Subject Areas:
Materials,
Chemistry,
Energy
Instruments:
I15-1-X-ray Pair Distribution Function (XPDF)
Added On:
29/01/2020 11:59
Documents:
Diaz-Lopez_et_al-2020.pdf
Discipline Tags:
Energy Storage
Energy
Physical Chemistry
Energy Materials
Chemistry
Materials Science
Technical Tags:
Scattering
Total Scattering