Positive electrode active material for lithium secondary battery

Patent metadata

Field	Value
Publication number	US-10186706-B2
Application number	US-201414891431-A
Country	US
Kind code	B2
Filing date	May 19, 2014
Priority date	May 17, 2013
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

Provided is a novel positive electrode active material which can effectively suppress the quantity of gas generated by the reaction with an electrolytic solution. Proposed is a positive electrode active material for a lithium secondary battery including positive electrode active material particles obtained by equipping the entire surface or a part of a surface of lithium manganese-containing composite oxide particles (also referred to as the “core particles”) operating at a charging voltage in a region exceeding 4.3 V in a metal Li reference potential with a layer A containing at least titanium (Ti), aluminum (Al), zirconium (Zr), or two or more kinds of these.

First claim

The invention claimed is:

1. A positive electrode active material for a lithium secondary battery comprising positive electrode active material particles, wherein the positive electrode active material particles comprises a layer (referred to as the “layer A”) comprising at least titanium (Ti), aluminum (Al), zirconium (Zr), or two or more kinds of these on a part of a surface of lithium manganese-containing composite oxide particles (also referred to as the “core particles”) operating at a charging voltage in a region exceeding 4.3 V in a metal Li reference potential, wherein a content of carbon (C) in the positive electrode active material is less than 0.1% by mass.

2. The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the layer A further comprises phosphorus (P).

3. The positive electrode active material for a lithium secondary battery according to claim 1 , wherein a thickness of the layer A is from 0.1 to 200 nm.

4. The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the positive electrode active material has a specific surface area of from 0.01 to 3.00 m 2 /g.

5. The positive electrode active material for a lithium secondary battery according to claim 1 , wherein D50 according to a volume-based particle size distribution obtained by measuring by a laser diffraction and scattering particle size distribution measuring method is from 3 to 40 μm.

6. The positive electrode active material for a lithium secondary battery according to claim 1 , wherein D10 according to a volume-based particle size distribution obtained by measuring by a laser diffraction and scattering particle size distribution measuring method is from 1 to 20 μm.

7. The positive electrode active material for a lithium secondary battery according to claim 1 , wherein Dmin according to a volume-based particle size distribution obtained by measuring by a laser diffraction and scattering particle size distribution measuring method is 10 μm or less.

8. The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the lithium manganese-containing composite oxide particles are spinel-type lithium manganese-containing composite oxide particles having an operating potential of 4.5 V or more at a metal Li reference potential.

9. The positive electrode active material for a lithium secondary battery according to claim 1 , wherein the lithium manganese-containing composite oxide particles are spinel-type lithium manganese-containing composite oxide particles including a crystal phase obtained by substituting a part of Mn sites in LiMn 2 O 4-δ with Li, a metal element M1, and another metal element M2.

10. A lithium secondary battery comprising the positive electrode active material for a lithium secondary battery according to claim 1 .

11. A positive electrode active material for a lithium secondary battery comprising positive electrode active material particles, wherein the positive electrode active material particles comprises a layer (referred to as the “layer A”) comprising at least titanium (Ti), aluminum (Al), or both of these on a part of a surface of lithium manganese-containing composite oxide particles (also referred to as the “core particles”) operating at a charging voltage in a region exceeding 4.3 V in a metal Li reference potential, wherein a content of carbon (C) in the positive electrode active material is less than 0.1% by mass.

12. The positive electrode active material for a lithium secondary battery according to claim 11 , wherein the layer A further comprises phosphorus (P).

13. The positive electrode active material for a lithium secondary battery according to claim 11 , wherein a thickness of the layer A is from 0.1 to 200 nm.

14. The positive electrode active material for a lithium secondary battery according to claim 11 , wherein the positive electrode active material has a specific surface area of from 0.01 to 3.00 m 2 /g.

15. The positive electrode active material for a lithium secondary battery according to claim 11 , wherein D50 according to a volume-based particle size distribution obtained by measuring by a laser diffraction and scattering particle size distribution measuring method is from 3 to 40 μm.

16. The positive electrode active material for a lithium secondary battery according to claim 11 , wherein D10 according to a volume-based particle size distribution obtained by measuring by a laser diffraction and scattering particle size distribution measuring method is from 1 to 20 μm.

17. The positive electrode active material for a lithium secondary battery according to claim 11 , wherein Dmin according to a volume-based particle size distribution obtained by measuring by a laser diffraction and scattering particle size distribution measuring method is 10 μm or less.

18. The positive electrode active material for a lithium secondary battery according to claim 11 , wherein the lithium manganese-containing composite oxide particles are spinel-type lithium manganese-containing composite oxide particles having an operating potential of 4.5 V or more at a metal Li reference potential.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Kagei Shinya
• Shibamura Natsumi
• Todorov Yanko Marinov
• Hata Yoshimi

Classifications

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/505 Primary

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

• H01M10/052

  Li-accumulators · CPC title