Positive-electrode material for lithium ion secondary battery, method and producing the same, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-10256466-B2
Application number	US-201615540730-A
Country	US
Kind code	B2
Filing date	Nov 9, 2016
Priority date	Nov 13, 2015
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li 1+a Ni b Mn c Co d Ti e M f O 2+α , and has an atomic ratio Ti 3+ /Ti 4+ between Ti 3+ and Ti 4+ , as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and α are numbers satisfying −0.1≤a≤0.2, 0.7<b≤0.9, 0≤c<0.3, 0≤d<0.3, 0<e≤0.25, 0≤f<0.3, b+c+d+e+f=1, and −0.2≤α≤0.2.

First claim

The invention claimed is:

1. A positive-electrode material for a lithium ion secondary battery, the positive-electrode material containing a lithium complex compound represented by the following Formula (1) and having an atomic ratio Ti 3+ /Ti 4+ between Ti 3+ and Ti 4+ , as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20:
Li 1+a Ni b Mn c Co d Ti e M f O 2+α   (1),

where in the Formula (1), M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and a are numbers satisfying −0.1≤a≤0.2, 0.7<b≤0.9, 0≤c<0.3, 0≤d<0.3, 0<e≤0.25, 0≤f<0.3, b+c+d+e+f=1,and −0.2≤α≤0.2.

2. The positive-electrode material for a lithium ion secondary battery according to claim 1 , wherein a concentrated Ti 3+ layer is provided on a surface of a secondary particle formed from a plurality of agglomerated primary particles of the lithium complex compound.

3. The positive-electrode material for a lithium ion secondary battery according to claim 1 having a particle fracture strength greater than or equal to 50 MPa and less than or equal to 200 MPa.

4. The positive-electrode material for a lithium ion secondary battery according to claim 1 , wherein a BET specific surface area is greater than or equal to 0.2 m 2 /g and less than or equal to 2.0 m 2 /g.

5. The positive-electrode material for a lithium ion secondary battery according to claim 1 , wherein a/e≤5 is satisfied in the Formula (1).

6. The positive-electrode material for a lithium ion secondary battery according to claim 1 , wherein e in the Formula (1) satisfies 0.005≤e≤0.15.

7. The positive-electrode material for a lithium ion secondary battery according to claim 1 , wherein a in the Formula (1) satisfies 0≤a≤0.06.

8. The positive-electrode material for a lithium ion secondary battery according to claim 1 , wherein
a plurality of primary particles of the lithium complex compound agglomerate to form a secondary particle, and
a surface of the secondary particle is fluorinated.

9. A positive-electrode material for a lithium ion secondary battery, the positive-electrode material containing a lithium complex compound represented by the following Formula (1) and having a concentrated Ti 3+ layer on a surface of a secondary particle formed from a plurality of agglomerated primary particles of the lithium complex compound:
Li 1+a Ni b Mn c Co d Ti e M f O 2+α   (1),

where in the Formula (1), M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and α are numbers satisfying −0.1≤a≤0.2, 0.7<b≤0.9, 0≤c<0.3, 0≤d<0.3, 0<e≤0.25, 0≤f<0.3, b+c+d+e+f=1, and −0.2≤α≤0.2.

10. The positive-electrode material for the lithium ion secondary battery according to claim 1 having a particle fracture strength greater than or equal to 50 MPa and less than or equal to 200 MPa and having a BET specific surface area greater than or equal to 0.2 m 2 /g and less than or equal to 2.0 m 2 /g, wherein e in the Formula (1) satisfies 0.005≤e≤0.15 and a in the Formula (1) satisfies 0≤a≤0.06.

11. A lithium ion secondary battery comprising the positive-electrode material for a lithium ion secondary battery according to claim 1 .

Assignees

• Hitachi Metals Ltd

Inventors

• Gunji Akira
• Tokoro Hisato
• Takahashi Shin
• Toyama Tatsuya
• Haruna Hiroshi
• TAKAMATSU Daiko
• Nakabayashi Takashi
• Takano Shuichi

Classifications

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C01P2006/40

  Electric properties · CPC title

• H01M4/62

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

• C01P2004/02

  obtained by optical microscopy · 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