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Li 2 O:Li–Mn–O Disordered Rock‐Salt Nanocomposites as Cathode Prelithiation Additives for High‐Energy Density Li‐Ion Batteries
Author(s) -
DiazLopez Maria,
Chater Philip A.,
Bordet Pierre,
Freire Melanie,
Jordy Christian,
Lebedev Oleg I.,
Pralong Valerie
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902788
Subject(s) - materials science , gravimetric analysis , cathode , lithium (medication) , nanocomposite , ion , salt (chemistry) , battery (electricity) , composite number , chemical engineering , inorganic chemistry , nanotechnology , composite material , chemistry , organic chemistry , thermodynamics , medicine , power (physics) , physics , engineering , endocrinology
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 Li 2 O:Li 2/3 Mn 1/3 O 5/6 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 Li 2/3 Mn 1/3 O 5/6 disordered rock salts. Such a high irreversible capacity is achieved by the reaction between Li 2 O and Li 2/3 Mn 1/3 O 5/6 during the first charge, where electrochemically active Li 2 O acts as a Li + donor. A 13% increase of the LiFePO 4 and LiCoO 2 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.