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

Patent metadata

Field	Value
Publication number	US-9972835-B2
Application number	US-201414515526-A
Country	US
Kind code	B2
Filing date	Oct 16, 2014
Priority date	Feb 11, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

Disclosed are a positive active material for a rechargeable lithium battery including a nickel-containing lithium transition metal composite oxide and a coating layer positioned on the surface of the lithium transition metal composite oxide, wherein the coating layer includes vanadium oxide, lithium vanadium oxide, or a combination thereof, a method of manufacturing the same, and a rechargeable lithium battery including the same.

First claim

What is claimed is:

1. A positive active material for a rechargeable lithium battery, comprising:
a nickel-containing lithium transition metal composite oxide; and
a coating layer positioned on the surface of the lithium transition metal composite oxide,
wherein the coating layer comprises Li c V 2 O 5 (0.05≤c≤6), and
wherein an inside of the lithium transition metal composite oxide comprises a compound represented by the following Chemical Formula 1 and an outside of the lithium transition metal composite oxide comprises a compound represented by the following Chemical Formula 2:
Li a Ni x M 1 y M 2 z O 2   [Chemical Formula 1]

wherein, in the above Chemical Formula 1, M 1 and M 2 are the same or different and are selected from Co, Mn, Al, Ti, Mg, or Zr, 1≤a≤1.05, 0.6≤x<1, 0.01<y≤0.35, and 0.01<z≤0.35,
Li a Ni x M 1 y M 2 z V t O 2   [Chemical Formula 2]

wherein, in the above Chemical Formula 2, M 1 and M 2 are the same or different and are selected from Co, Mn, Al, Ti, Mg, or Zr, 1≤a≤1.05, 0.6≤x<1, 0.01<y≤0.35, 0.01<z≤0.35, and 0.001<t≤0.02.

2. The positive active material for a rechargeable lithium battery of claim 1 , wherein the lithium transition metal composite oxide comprises about 60 mol % or more of nickel based on the total amount of a transition metal.

3. The positive active material for a rechargeable lithium battery of claim 1 , wherein the coating layer comprises V 2 O 5 and Li c V 2 O 5 (0.05≤c≤6).

4. The positive active material for a rechargeable lithium battery of claim 3 , wherein the outside of the coating layer comprises V 2 O 5 , and
the inside of the coating layer comprises Li c V 2 O 5 (0.05≤c≤6).

5. The positive active material for a rechargeable lithium battery of claim 1 , wherein the coating layer is comprised in an amount of about 0.1 to about 5 parts by mole based on 100 parts by mole of a total amount of transition metals in the lithium transition metal composite oxide, wherein the total amount of transition metals is a total amount of Ni, M 1 and M 2 included in Chemical Formula 1.

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

Assignees

• Unist Academy Industry Res Corporation
• Ulsan Nat Inst Science & Tech Unist

Inventors

• Cho Jaephil
• Noh Mi-Jung

Classifications

• C01G53/50

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

• C01P2002/52

  containing elements as dopants · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/485

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

• H01M4/366 Primary

  as layered products · CPC title