Manufacturing Method Of Cathode Active Material, And Cathode Active Material For Lithium Secondary Battery Manufactured Thereby

Patent metadata

Field	Value
Publication number	US-2018351169-A1
Application number	US-201816058594-A
Country	US
Kind code	A1
Filing date	Aug 8, 2018
Priority date	Oct 29, 2013
Publication date	Dec 6, 2018
Grant date	—

Abstract

Also, a coating layer may be formed in which the lithium boron oxide is uniformly coated in an amount proportional to the used amount of the boron-containing compound even at a low heat treatment temperature.

First claim

1 . A cathode active material comprising:
a lithium transition metal oxide; and a coating layer including a lithium boron oxide on a surface of the lithium transition metal oxide.

2 . The cathode active material of claim 1 , wherein the coating layer comprises elemental boron (B) in an amount of 100 ppm to 2,000 ppm.

3 . The cathode active material of claim 1 , wherein the coating layer comprises elemental B in an amount of 250 ppm to 1,100 ppm.

4 . The cathode active material of claim 1 , wherein a thickness of the coating layer is in a range of 10 nm to 1,000 nm.

5 . The cathode active material of claim 1 , wherein a portion of elemental B of the lithium boron oxide is further included in the lithium transition metal oxide.

6 . The cathode active material of claim 5 , wherein the lithium transition metal oxide is represented by Chemical Formula 3, and, in Chemical Formula 3, w has a concentration gradient gradually decreasing from the surface of the lithium transition metal oxide to inside thereof:
Li 1+a [Ni x Mn y Co z B w M v ]O 2-c A c   <Chemical Formula 3>
where M is any one selected from the group consisting of aluminum (Al), zirconium (Zr), zinc (Zn), titanium (Ti), magnesium (Mg), gallium (Ga), and indium (In), or two or more elements thereof; A is at least one selected from the group consisting of phosphorus (P), fluorine (F), sulfur (S), and nitrogen (N), and 0≤x≤1.0, 0≤y<0.6, 0≤z<0.6, 0≤v≤0.1, 0≤a<0.3, 0≤c≤0.2, and a+x+y+z+v=1, and 0≤w≤0.1.

7 . The cathode active material of claim 1 , wherein the cathode active material comprises lithium impurities in an amount of less than 0.3 wt % based on a total weight of the cathode active material.

8 . The cathode active material of claim 1 , wherein the lithium boron oxide is LiBO 2 , Li 2 B 4 O 7 , or a mixture thereof.

9 . A cathode comprising the cathode active material of claim 1 .

10 . A lithium secondary battery comprising the cathode of claim 9 .

Assignees

• Lg Chemical Ltd

Inventors

• Oh Hyun Jin
• Shin Ho Suk
• Lim Jin Hyung
• Lee Dong Hun
• Jin Joo Hong
• Jung Wang Mo

Classifications

• 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

• H01M4/366 Primary

  as layered products · CPC title

• C01P2006/40

  Electric properties · CPC title

• 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

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title