Nickel-rich and manganese-rich quaternary metal oxide...

Details Nickel-rich and manganese-rich quaternary metal oxide... Nickel-rich and manganese-rich quaternary metal oxide...

H - Electricity

01

M

H01M 4/48 (2006.01) H01M 4/50 (2006.01) H01M 4/52 (2006.01)

Patent

CA 2394146

Positive electrode-active materials for use in lithium-ion and lithium-ion polymer batteries contain quaternary composite oxides of manganese, nickel, cobalt and aluminum where one of the four is present at levels of over 70 mol percent. For example, LixMn0,2 Ni0,7 Co0,05 On and LixMn0,7 Ni0,2 Co0,05 Al0,05 On. The composite oxides can be lithiated to form positive electrode- active materials that are stable over at least ten charge/discharge cycles at voltage levels over 4.8 volts, and have capacities of over 200 mAh/g. Methods for producing the materials and electrochemical cells and batteries that include the materials are also provided.

L'invention porte sur des matériaux actifs d'électrode positive pour accumulateurs à base d'ions-lithium et à base de polymères aux ions-lithium contenant des oxydes composites quaternaires de manganèse, nickel, cobalt et aluminium, l'un d'entre eux étant présent à plus de 70 % en moles, par exemple, LixMn 0,2 Ni 0,7 Co 0,05 On et LixMn 0,7 Ni 0,2 Co 0,05 Al 0,05 On. Les oxydes composites peuvent être lithiés de façon à former des matériaux actifs d'électrode positive qui sont stables sur au moins dix cycles de charge/décharge à des niveaux de tension supérieurs à 4,8 volts et ont des capacités de plus de 200 mAh/g. L'invention porte également sur des procédés de production de matériaux et sur des piles électrochimiques et des accumulateurs comprenant ces matériaux.

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