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Atomic Layer Deposition of a Particularized Protective MgF 2 Film on a Li‐Ion Battery LiMn 1.5 Ni 0.5 O 4 Cathode Powder Material
Author(s) -
Kraytsberg Alexander,
Drezner Haika,
Auinat Mahmud,
Shapira Alon,
Solomatin Nickolay,
Axmann Peter,
WohlfahrtMehrens Margret,
EinEli Yair
Publication year - 2015
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201500149
Subject(s) - cathode , materials science , atomic layer deposition , electrolyte , battery (electricity) , magnesium fluoride , layer (electronics) , ion , fluoride , deposition (geology) , decomposition , chemical engineering , inorganic chemistry , nanotechnology , chemistry , electrode , paleontology , power (physics) , physics , organic chemistry , quantum mechanics , sediment , engineering , biology
A several atomic layers thick magnesium fluoride (MgF 2 ) film is successfully deposited onto each individual grain of an ultrahigh‐potential LiMn 1.5 Ni 0.5 O 4 ‐powder material for Li‐ion batteries. The resulting film has a marked protection action, as it does not compromise the cathode performance substantially, while it extends the cycle life of the cathodes prepared from the coated powder. The protective effect is pronounced at 45 °C and the catastrophic capacity fading is halted. The essence of the protecting action is suggested to be in blocking the access of aggressive electrolyte‐decomposition byproducts to the cathode material surface.