Positive-electrode active material for lithium secondary cell, positive electrode for lithium secondary cell, and lithium secondary cell

Patent metadata

Field	Value
Publication number	US-10756343-B2
Application number	US-201615577727-A
Country	US
Kind code	B2
Filing date	Jun 2, 2016
Priority date	Jun 2, 2015
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A positive electrode active material for a lithium secondary cell, having a layered structure and comprising at least nickel, cobalt and manganese, the positive electrode active material satisfying requirements (1), (2) and (3) below: (1) a composition represented by a composition formula: Li[Lix(NiαCoβMnγMδ)1-x]O2, wherein 0≤x≤0.10, 0.30<α≤0.34, 0.30<β≤0.34, 0.32≤γ<0.40, 0≤δ≤0.10, β<γ, δ+α+β+γ=1, M represents at least one metal selected from the group consisting of Fe, Cu, Ti, Mg, Al, W, Zn, Sn, Zr, Ga and V; (2) a secondary particle diameter of 2 μm or more and 10 μm or less; and (3) a maximum peak value in a pore diameter range of 90 nm to 150 nm in a pore diameter distribution determined by mercury porosimetry.

First claim

The invention claimed is:

1. A positive electrode active material for a lithium secondary cell, having a layered structure and comprising at least nickel, cobalt and manganese, the positive electrode active material satisfying requirements (1), (2), and (3) below:
(1) a composition represented by a composition formula:
Li[Li x (Ni α Co β Mn γ M δ ) 1-x ]O 2 ,

wherein 0≤x≤0.10, 0.30<α≤0.34, 0.30<β≤0.34, 0.32≤γ<0.40, 0≤δ≤0.10, β<γ, δ+α+β+γ=1, M represents at least one metal selected from the group consisting of Fe, Cu, Ti, Mg, Al, W, Zn, Sn, Zr, Ga and V;
(2) a secondary particle diameter of 2 μm or more and 10 μm or less; and
(3) a maximum peak value in a pore diameter range of 90 nm to 150 nm in a pore diameter distribution determined by mercury porosimetry.

2. The positive electrode active material according to claim 1 , wherein the secondary particle diameter is 2.5 μm or more and 7 μm or less.

3. The positive electrode active material according to claim 1 , wherein a pore volume of pores having diameters in the range of 10 nm to 200 nm in the pore distribution determined by mercury porosimetry is 0.025 cm 3 /g or more and 0.045 cm 3 /g or less.

4. A positive electrode for a lithium secondary cell, comprising the positive electrode active material of claim 1 .

5. A positive electrode for a lithium secondary cell, comprising the positive electrode active material of claim 3 .

6. A lithium secondary cell, comprising the positive electrode of claim 4 .

7. The positive electrode active material according to claim 2 , which has a BET specific surface area of 1.5 m 2 /g or more and 2.5 m 2 /g or less.

8. The positive electrode active material according to claim 2 , wherein a pore volume of pores having diameters in the range of 10 nm to 200 nm in the pore distribution determined by mercury porosimetry is 0.025 cm 3 /g or more and 0.045 cm 3 /g or less.

9. A positive electrode for a lithium secondary cell, comprising the positive electrode active material of claim 2 .

10. A lithium secondary cell, comprising the positive electrode of claim 8 .

11. A lithium secondary cell, comprising the positive electrode of claim 9 .

12. The positive electrode active material according to claim 1 , which has a BET specific surface area of 1.5 m 2 /g or more and 2.5 m 2 /g or less.

13. The positive electrode active material according to claim 12 , wherein a pore volume of pores having diameters in the range of 10 nm to 200 nm in the pore distribution determined by mercury porosimetry is 0.025 cm 3 /g or more and 0.045 cm 3 /g or less.

14. A positive electrode for a lithium secondary cell, comprising the positive electrode active material of claim 12 .

Assignees

• Sumitomo Chemical Co
• Tanaka Chemical Corp

Inventors

• Kurita Hiroyuki
• Kageura Jun-Ichi
• Imanari Yuichiro
• Iida Yasutaka
• Yamashita Daisuke
• Masukawa Takaaki
• Ito Hiroyuki

Classifications

• C01G53/50 Primary

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• C01P2004/45

  Aggregated particles or particles with an intergrown morphology · CPC title

• C01P2002/20

  Two-dimensional structures · CPC title

• C01P2006/11

  Powder tap density · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title