Positive active material for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-10930934-B2
Application number	US-201816198081-A
Country	US
Kind code	B2
Filing date	Nov 21, 2018
Priority date	Jan 13, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A positive active material for a rechargeable lithium battery including a lithium metal compound and a phosphorus (P)-containing compound on the surface of the lithium metal compound. A content of phosphorus (P) of the phosphorus-containing compound is about 0.1 atom % to about 10 atom % based on the total amount of elements on the surface of the positive active material. A method of preparing the same and rechargeable lithium battery including the same are also provided.

First claim

What is claimed is:

1. A positive active material for a rechargeable lithium battery, the positive active material comprising a lithium metal compound and a phosphorus (P)-containing compound on the surface of the lithium metal compound,
wherein a content of phosphorus (P) of the phosphorus-containing compound is about 0.1 atom % to about 10 atom % based on the total amount of elements on the surface of the positive active material.

2. The positive active material as claimed in claim 1 , wherein the phosphorus-containing compound includes lithium phosphate.

3. The positive active material as claimed in claim 1 , wherein the phosphorus-containing compound includes Li 3 PO 4 , Li 2 HPO 4 , LiH 2 PO 4 , LiMPO 4 , where M=Fe, Co, Mn, Ni, V, La, Ti, or Al, (NH 4 ) 2 HPO 4 , (NH 4 )H 2 PO 4 , AlPO 4 , H 3 PO 4 , or a combination thereof.

4. The positive active material as claimed in claim 1 , wherein the lithium metal compound includes a lithium nickel-based oxide represented by Chemical Formula 1:
Li x Ni y M z O 2   [Chemical Formula 1]

wherein,
M is Co, Mn, Al, Mg, Ti, Zr, or a combination thereof, 0.95≤x≤1.00, 0.4≤y≤1.00, 0≤z≤0.6, and y+z=1.

5. A rechargeable lithium battery comprising the positive electrode including a positive active material as claimed in claim 1 .

6. The positive active material as claimed in claim 1 , wherein:
the positive active material is prepared by washing a first active material with an aqueous solution of a phosphorus (P)-containing material to obtain a second active material,
the first active material includes the lithium metal compound and a lithium compound present on the surface of the lithium metal compound, the lithium metal compound being different from the lithium compound, and
the second active material includes the lithium metal compound and the phosphorus-containing compound present on the surface of the lithium metal compound.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Hong Ming-Zi
• Kim Ki-Hyun
• Park Do-Hyung
• Han Jung-Min
• Lee Jae-Ho

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/525

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/366

  as layered products · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title