Positive active material and method for producing the same

Patent metadata

Field	Value
Publication number	US-10483537-B2
Application number	US-201715634330-A
Country	US
Kind code	B2
Filing date	Jun 27, 2017
Priority date	Dec 31, 2014
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

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

The invention claimed is:

1. A method for producing a positive active material comprising LiAlO 2 in a surface and being given in Formula 1 that is Li 1+a Ni b M1 c M2 d O 2 , comprising:
preparing the positive active material;
preparing a washing solution in uniform temperature;
agitating the positive active material in the washing solution;
drying the washed positive active material; and
mixedly agitating the positive active material with a compound including Al,
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.

2. The method of claim 1 , 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 ) 3 , AlCl 3 , AlH 3 , AlF 3 , and AlPO 4 .

3. The method of claim 1 , wherein the washing solution is distilled water or an alkaline solution.

4. The method of claim 1 , 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

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/364

  as mixtures · CPC title

• C01F7/043

  Lithium aluminates · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01P2004/84

  one phase coated with the other · CPC title