Li 2 O:Li–Mn–O Disordered Rock‐Salt Nanocomposites as Cathode Prelithiation Additives for High‐Energy Density Li‐Ion Batteries
Résumé
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.
Domaines
Chimie
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Advanced Energy Materials - 2020 - Diaz‐Lopez - Li2O Li Mn O Disordered Rock‐Salt Nanocomposites as Cathode Prelithiation.pdf (1.14 Mo)
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