Ni based cathode material for rechargeable lithium-ion batteries

Patent metadata

Field	Value
Publication number	US-12315915-B2
Application number	US-201816223513-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Jul 14, 2017
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

The invention provides a positive electrode material for lithium ion batteries, comprising a lithium transition metal-based oxide powder having a general formula Li1+a ((Niz(Ni0.5Mn0.5)y Cox)1−kAk)1−aO2, wherein A is a dopant, with −0.025≤a≤0.025, 0.15≤x≤0.22, 0.42≤z≤0.52, 1.075<z/y<1.300, x+y+z=1 and k≤0.01. Different embodiments provide the following features:the lithium transition metal-based oxide powder has a carbon content ≤1000 ppm or even ≤400 ppm;the lithium transition metal-based oxide powder has a sulfur content between 0.05 and 1.0 wt %;a dopant A is Zr, and the powder further comprises up to 1 wt % of a coating comprising a boron compound and WO3.

First claim

The invention claimed is:

1. A positive electrode material for lithium ion batteries, comprising a lithium transition metal-based oxide powder having a general formula Li 1+a ((Ni z (Ni 0.5 Mn 0.5 ) y Co x ) 1−k A k ) 1−a O 2, wherein A is a dopant, 0≤a≤0.05, 0.15≤x≤0.20, z≤0.45, 1.125<z/y<1.285, x+y+z=1 and k≤0.01, and wherein the positive electrode active material has a crystallite size 26.1 nm to less than 41.5 nm as determined by the Sherrer equation based on the peak of the (104) plane obtained from the X-ray diffraction pattern using a Cu Kα radiation source, and capacity fade rate of below 20 %/100 cycles as determined according to Testing Method 1.

2. The positive electrode material of claim 1 , wherein 0.15≤x<0.18.

3. The positive electrode material of claim 1 , wherein the powder further comprises up to 1 wt % of a coating comprising either one or more of Al 2 O 3 , WO 3 , LiA 1 O 2 , LiF, Li 3 PO 4 , Li 2 ZrO 3 , Li 2 WO 4 , MgO and Li 2 TiO 3 .

4. The positive electrode material of claim 1 , wherein the powder further comprises up to 1 wt % of a coating comprising a boron compound.

5. The positive electrode material of claim 4 , wherein the boron compound is either one or more of LiBO 2 , Li 2 B 4 O 7 , B 2 O 3 and Li 3 BO 3 .

6. The positive electrode material of claim 1 , wherein the dopant A is either one or more of Al, Ca, W, B, Si, Ti, Mg and Zr.

7. The positive electrode material of claim 1 , wherein a dopant A is Zr, and wherein the powder further comprises up to 1 wt % of a coating comprising a boron compound and WO 3 .

8. The positive electrode material of claim 1 , wherein 0≤a≤0.025.

9. The positive electrode material of claim 1 , wherein the lithium transition metal-based oxide powder has a carbon content ≤1000 ppm, wherein the carbon content in the positive electrode material is determined with an analysis of CO 2 and CO contents in a gas resulting from combustion of the positive electrode material.

10. The positive electrode material of claim 1 , wherein the lithium transition metal-based oxide powder has a sulfur content between 0.05 and 1.0 wt %.

Assignees

• Umicore Nv
• Umicore Korea Ltd

Inventors

• Kim Jihye
• Paulsen Jens
• Park Areum
• Kim Dae-Hyun
• Gil Hee-Sung

Classifications

• C01P2006/80

  Compositional purity · CPC title

• C01P2004/03

  obtained by SEM · 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

• C01P2002/72

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

• C01P2002/60

  Compounds characterised by their crystallite size · CPC title