Positive active material for lithium rechargeable battery, manufacturing method thereof, and lithium rechargeable battery including same positive active material

Patent metadata

Field	Value
Publication number	US-2021184213-A1
Application number	US-201816767699-A
Country	US
Kind code	A1
Filing date	Nov 20, 2018
Priority date	Dec 21, 2017
Publication date	Jun 17, 2021
Grant date	—

Abstract

The present disclosure relates to a positive active material for a lithium rechargeable battery, a manufacturing method thereof, and a lithium rechargeable battery including the positive active material, and it provides a positive active material which is a lithium composite metal oxide including nickel, cobalt, and manganese, and either has orientation in a direction of [001] with respect to an ND axis that is equal to or greater than 29% or has orientation in a direction of [120]+[210] with respect to an RD axis that is equal to or greater than 82% in the case of an EBSD analysis with a misorientation angle (Δg) that is equal to or less than 30 degrees.

First claim

1 . A positive active material which is a lithium composite metal oxide including nickel, cobalt, and manganese, and has orientation in a direction of with respect to an ND axis that is equal to or greater than 29% in the case of an EBSD analysis with a misorientation angle (Δg) that is equal to or less than 30 degrees.

2 - 6 . (canceled)

7 . The positive active material of claim 1 , wherein
the lithium composite metal oxide being manufactured according to a co-precipitation method, in this instance, [a total number of moles of metal ions in a metal salt aqueous solution: a number of moles of ammonia] being controlled.

8 . The positive active material of claim 1 , wherein
the lithium composite metal oxide being manufactured according to a co-precipitation method, and a pH range being controlled in this instance.

9 . The positive active material of claim 1 , wherein
the lithium composite metal oxide being manufactured according to a co-precipitation method, and a residence time in a reactor of a metal aqueous solution being controlled in this instance.

10 . The positive active material of claim 1 , wherein
the lithium composite metal oxide being manufactured according to a co-precipitation method, and an agitation speed in a co-precipitation reactor being controlled in this instance.

11 . The positive active material of claim 1 , wherein
the lithium composite metal oxide being manufactured according to a co-precipitation method, and a reaction temperature in a co-precipitation reactor being controlled in this instance.

12 - 18 . (canceled)

19 . A method for manufacturing a positive active material, comprising:
inducing a co-precipitation reaction while agitating a metal salt aqueous solution including a nickel salt, a manganese salt, and a cobalt salt, ammonia, and caustic soda in a reactor; obtaining a composite metal hydroxide precursor including nickel, cobalt, and manganese by the inducing of a co-precipitation reaction; and obtaining a lithium composite oxide by mixing the composite metal hydroxide and a lithium raw material and baking the same, wherein, in the inducing of a co-precipitation reaction, a number of moles of ammonia against a total number of moles of metal ions in the metal salt aqueous solution is 1:0.95 to 1:1.5 [the total number of moles of metal ions in the metal salt aqueous solution: the number of moles of ammonia].

20 . The method of claim 19 , wherein
the inducing of a co-precipitation reaction includes continuously inputting the metal salt aqueous solution into the reactor, injecting the ammonia by a fixed quantity, and inputting the caustic soda so as to maintain pH in the reactor.

21 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, a number of moles of the ammonia injected by a fixed quantity against a total number of moles of metal ions of the continuously input metal salt aqueous solution is 1:1.1 to 1:1.2 [a total number of moles of metal ions of the continuously input metal salt aqueous solution: a number of moles of ammonia injected by a fixed quantity].

22 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, a temperature in the reactor is 25 to 55° C.

23 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, a temperature in the reactor is 30 to 45° C.

24 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, a residence time of the metal salt solution in the reactor is 30 minutes to 4 hours.

25 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, a residence time of the metal salt solution in the reactor is 30 minutes to 1 hour.

26 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, pH in the reactor is maintained at a range of 10.5 to 12.0.

27 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, an agitation speed of metal salt aqueous solution, ammonia, and caustic soda in the reactor is 3 m/s to 15 m/s as a linear velocity.

28 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, an agitation speed of a metal salt aqueous solution, ammonia, and caustic soda in the reactor is 80 to 200 rpm as a rotation speed.

29 . The method of claim 19 , wherein
in the inducing of a co-precipitation reaction, [a total number of moles of metal ions of a continuously input metal salt aqueous solution: a number of moles of ammonia injected by a fixed quantity] is 1:1.1 to 1:1.2, pH is the reactor is maintained at a range of 10.5 to 12.0, a temperature inside the reactor is 30 to 45° C., a residence time of the metal salt solution in the reactor is 30 minutes to 1 hour, and an agitation speed (a linear velocity) of metal salt aqueous solution, ammonia, and caustic soda in the reactor is 3 msec to 15 m/s.

30 . The method of claim 20 , further comprising,
before the inducing of a co-precipitation reaction, controlling pH inside the reactor to be 10.5 to 12.0 by inputting a mixed solution of ammonia and caustic soda into the reactor.

31 . A lithium rechargeable battery comprising:
a positive electrode including a positive active material of claim 1 ; a negative electrode; and an electrolyte.

Assignees

• Res Inst Ind Science & Tech

Inventors

• Song Jung Hoon
• Hwangbo Geun
• Nam Sang Cheol
• Lee Sang Hyuk
• Kim Do Hyeong
• Park Hye Won

Classifications

• C01P2006/11

  Powder tap density · CPC title

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title