Active material for a lithium secondary battery, method of manufacturing the same, electrode including the active material, and lithium secondary battery including the electrode
AssigneeSamsung SDI Co., Ltd.
InventorsAndrei Kapylou, Jay-Hyok Song, Evgeniya Matulevich, Chang-Wook Kim, Yong-Chan You, Sun-Ho Kang
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Abstract
An active material for a lithium secondary battery, a method of manufacturing the same, an electrode including the active material, and a lithium secondary battery including the electrode, the active material including a lithium composite oxide represented by the following Formula 1: Li[LixNiaCobMnc]O2-yFy. [Formula 1]
Claims17
An active material for a lithium secondary battery, the active material comprising a lithium composite oxide represented by the following Formula 1:
- Li[LixNiaCobMnc]O2-yFy, [Formula 1]
- wherein:
- in Formula 1, x, a, b, c, and y satisfy the following relations:
- 0.05≦x≦0.3, 0.12≦a≦0.25, 0.00≦b≦0.25, 0.45≦c≦0.60, x+a+b+c=1.0, 1.25≦(1+x)/(a+b+c)≦1.6, and 0<y≦0.1, and
- the lithium composite oxide has a full width at half maximum of a diffraction angle at a (003) surface of about 0.216° to about 0.219° in a powder X-ray diffraction spectrum obtained by using CuKα ray.
A method of manufacturing an active material for a lithium secondary battery, the method comprising:
- mixing a fluorine-containing compound, a lithium compound, and a metal hydroxide represented by the following Formula 2:
- NiaCobMnc(OH)2 [Formula 2]
- wherein, in Formula 2, a, b, and c satisfy the following relations:
- 0.15≦a≦0.30, 0.0≦b≦0.30, 0.55≦c≦0.70, and a+b+c=1.0;
- heat treating the mixture under an oxidizing atmosphere at a temperature of about 650° C. to about 850° C.;
- and
- cooling the heat treated mixture at a cooling rate of about 0.1° C./min to about 2° C./min such that the active material includes a lithium composite oxide having a full width at half maximum of a diffraction angle at a (003) surface of about 0.216° to about 0.219° in a powder X-ray diffraction spectrum obtained by using CuKα ray.
Dependencies are inferred from the claim text.