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

Patent metadata

Field	Value
Publication number	US-10784499-B2
Application number	US-201715487616-A
Country	US
Kind code	B2
Filing date	Apr 14, 2017
Priority date	Apr 15, 2016
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

A positive active material for a rechargeable lithium battery includes a compound represented by Chemical Formula 1, LiaNixCoyMezM1kM2pO2 wherein, 0.9≤a≤1.1, 0.7≤x≤0.93, 0<y≤0.3, 0<z≤0.3, 0.001≤k≤0.006, 0.001≤p≤0.005, x+y+z+k+p=1, Me is Mn or Al, M1 is a divalent element, and M2 is a tetravalent element.

First claim

What is claimed is:

1. A positive active material for a rechargeable lithium battery, the positive active material comprising:
a compound represented by Chemical Formula 1:
Li a Ni x Co y Me z M 1 k M 2 p O 2   [Chemical Formula 1]

wherein,
0.9≤a≤1.1, 0.7≤x≤0.93, 0<y≤0.3, 0<z≤0.3, 0.001≤k≤0.006, 0.001≤p≤0.005, x+y+z+k+p=1, 0.002≤k+p≤0.01,
Me is Mn or Al,
M 1 is a divalent element, and
M 2 is a tetravalent element.

2. The positive active material as claimed in claim 1 , wherein:
M 1 is Mg, Ba, or a combination thereof, and
M 2 is Ti, Zr, Mn, Si, or a combination thereof.

3. The positive active material as claimed in claim 1 , wherein k and p are in a ratio k:p of about 2:8 to about 8:2.

4. The positive active material as claimed in claim 1 , wherein a c-axis spacing in a crystal structure of the positive active material is about 14.168 Å to about 14.174 Å.

5. The positive active material as claimed in claim 1 , wherein a full width at half maximum, FWHM (003) of a diffraction peak at a (003) plane by X-ray diffraction of the positive active material is about 0.13 to about 0.16.

6. The positive active material as claimed in claim 1 , wherein M 1 is Mg and M 2 is Ti.

7. The positive active material as claimed in claim 1 , wherein x is in a range of 0.8≤x≤0.9.

8. A rechargeable lithium battery, comprising
a positive electrode including the positive active material as claimed in claim 1 ;
a negative electrode including a negative active material; and
an electrolyte.

9. A positive active material for a rechargeable lithium battery, the positive active material comprising:
a compound represented by Chemical Formula 1:
Li a Ni x Co y Me z M 1 k M 2 p O 2   [Chemical Formula 1]

wherein,
0.9≤a≤1.1, 0.7≤x≤0.93, 0<y≤0.3, 0<z≤0.3, 0.001≤k≤0.006, 0.001≤p≤0.005, x+y+z+k+p=1,
k and p are in a ratio k:p of about 2:8 to about 8:2,
Me is Mn or Al,
M 1 is a divalent element, and
M 2 is a tetravalent element.

10. A positive active material for a rechargeable lithium battery, the positive active material comprising:
a compound represented by Chemical Formula 1:
Li a Ni x Co y Me z M 1 k M 2 p O 2   [Chemical Formula 1]

wherein, 0.9≤a≤1.1, 0.8≤x≤0.9, 0<y≤0.3, 0<z≤0.3, 0.001≤k≤0.006, 0.001≤p≤0.005, x+y+z+k+p=1,
Me is Mn or Al,
M 1 is a divalent element, and
M 2 is a tetravalent element.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Dae-Hoe
• Park Do-Hyung
• You Yong-Chan
• Kim Min-Han

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/505

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

• H01M4/50

  of manganese · CPC title

• H01M4/52

  of nickel, cobalt or iron · CPC title

• H01M4/463

  Aluminium based · CPC title