Cathode active material for lithium secondary battery, preparation method therefor, and lithium secondary battery comprising same
AssigneesPosco Holdings Inc., Research Institute of Industrial Science & Technology, Posco Future M Co., Ltd.
InventorsByong Yong YU, Kijoo HONG, Jung Hoon SONG, Sanghyuk LEE, Kwon Young CHOI, Chang Joo HAN, Sang Cheol NAM
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Abstract
The present exemplary embodiments relate to a positive active material for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery including the same. The positive active material for a lithium secondary battery according to an exemplary embodiment includes first lithium metal oxide that contains nickel, cobalt, manganese, and doping elements, is in the form of single particles, and has a unit cell volume of 101.50 Å or more.
Claims21
A positive active material for a lithium secondary battery, comprising:
- a first lithium metal oxide;
- wherein, the first lithium metal oxide includes nickel, cobalt, manganese and a doping element,
- the first lithium metal oxide is in the form of a single particle, and
- a unit cell volume of the first lithium metal oxide is 101.50 Å or more.
A method of preparing a positive active material for lithium secondary battery, comprising:
- preparing an aqueous solution of a metal salt containing nickel raw material, cobalt raw material, and manganese raw material;
- obtaining a metal hydroxide by supplying the aqueous solution of the metal salt to a co-precipitation reactor;
- first sintering a mixture of the metal hydroxide particle, a lithium raw material and a doping raw material, for 8 to 15 hours in the 800° C. to 950° C. range;
- and
- obtaining a first lithium metal oxide in the form of single particle by additionally adding lithium raw material to the sintered first lithium metal oxide and performing second sintering.
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Dependencies are inferred from the claim text.