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As everal atomic layers thick magnesium fluoride (MgF 2 )f ilm 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 am arked protection action, as it does not compromise the cathode performance substantially,w hile it extends the cycle life of the cathodes prepared from the coatedp owder.T he protective effect is pronounceda t4 58Ca nd the catastrophicc apacity fading is halted. The essence of the protecting action is suggestedt ob ei nb lockingt he access of aggressive electrolyte-decompositionb yproducts to the cathode material surface.

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