Positive active material and method for producing the same

Patent metadata

Field	Value
Publication number	US-2017294651-A1
Application number	US-201715634330-A
Country	US
Kind code	A1
Filing date	Jun 27, 2017
Priority date	Dec 31, 2014
Publication date	Oct 12, 2017
Grant date	—

Abstract

The present invention relates to a positive active material and a method for producing same and, more specifically, to a positive active material comprising LiAlO2 at the surface thereof as a result of reacting an Al compound with residual lithium and to a method for producing same.

First claim

1 . A positive active material comprising LiAlO 2 in a surface.

2 . The positive active material of claim 1 , including LiAlO 2 exhibiting a peak, where 2θ is ranged from 45° to 46°, in XRD.

3 . The positive active material of claim 1 , being given in Formula 1 that is Li 1+a Ni b M1 c M2 d O 2 where 0.95≧b≧0.75, a+b+c=1, M1 is one or more selected from a group of Co, B, Ba, Cr, F, Li, Mo, P, Sr, Ti, and Zr, and M2 is one or more selected from a group of Mn, Al, B, Ba, Cr, F, Li, Mo, P, Sr, Ti, and Zr.

4 . The positive active material of claim 1 , wherein residual lithium is equal to or smaller than 0.6 wt %.

5 . The positive active material of claim 1 , wherein particle strength is equal to or larger than 150 MPa.

6 . A method for producing a positive active material according to claim 1 , comprising:
preparing the positive active material; and mixedly agitating the positive active material with a compound including Al.

7 . The method of claim 6 , wherein the compound including the Al is selected from a group of Al(OH) 3 , Al 2 O 3 , Al(NO 3 ) 3 , Al 2 (SO 4 ), AlCl 3 , AlH 3 , AlF 3 , and AlPO 4 .

8 . The method of claim 7 , further comprising, between the preparing of the positive active material and the mixedly agitating of the positive active material:
preparing a washing solution in uniform temperature; agitating the positive active material in the washing solution; and drying the washed positive active material.

9 . The method of claim 8 , wherein the washing solution is distilled water or an alkaline solution.

10 . The method of claim 8 , wherein the drying includes:
Vacuum-drying the washed positive active material at 80 to 200° C. for 5 to 20 hours.

Assignees

• Ecopro Bm Co Ltd

Inventors

• Choi Moon Ho
• Kim Jik Soo
• Yun Jin Kyeong
• Jeon Suk Yong
• Jung Jae Yong
• Lee Suk Whan

Classifications

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• C01P2004/84

  one phase coated with the other · CPC title

• C01G53/00

  Compounds of nickel · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/364

  as mixtures · CPC title