Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

• US 20040229123A1
• Filed: 03/23/2004
• Published: 11/18/2004
• Est. Priority Date: 03/25/2003
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Takahashi, Takeshi, Fujino, Kenji, Kondo, Takeyuki, Seyama, Jun, Oba, Takeshi, Tokuno, Junichi, Morizaki, Masuhiro
• Granted Patent: US 7,851,088 B2
• Time in Patent Office: Days
• US Class Current: 429/231.1
• CPC Class Codes: C01G 51/04 Oxides; Hydroxides
• CPC Class Codes: C01G 51/42 containing alkali metals, e.g. LiCoO2
• CPC Class Codes: C01G 53/42 containing alkali metals, e.g. LiNiO2
• CPC Class Codes: C01P 2002/52 containing elements as dopants
• CPC Class Codes: C01P 2002/85 by XPS, EDX or EDAX data
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

Disclosed is a positive electrode active material for a nonaqueous electrolyte secondary battery having at least a lithium-transition metal composite oxide of a layer structure, in which an existence ratio of at least one selected from the group consisting of elements which may become tetravalent and magnesium is 20% or more on a surface of the lithium-transition metal composite oxide. By use of this positive electrode active material, a nonaqueous electrolyte secondary battery having excellent battery characteristics, specifically, having excellent high rate characteristics, cycle characteristics, low-temperature characteristics, thermal stability, and the like, under the even more harsh environment for use can be realized.

Claims

1. A positive electrode active material for a nonaqueous electrolyte secondary battery having at least a lithium-transition metal composite oxide of a layer structure,

in which an existence ratio of at least one selected from the group consisting of elements which may become tetravalent and magnesium is 20% or more on a surface of the lithium-transition metal composite oxide.

2. The positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium is zirconium.

3. The positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium is magnesium.

4. The positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium is titanium.

5. The positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium are zirconium and magnesium.

7. A positive electrode mixture containing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 and a conductive agent, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium exists between the positive electrode active material for a nonaqueous electrolyte secondary battery and the conductive agent.

8. A positive electrode mixture containing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 2 and a conductive agent, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium exists between the positive electrode active material for a nonaqueous electrolyte secondary battery and the conductive agent.

9. A positive electrode mixture containing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 3 and a conductive agent, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium exists between the positive electrode active material for a nonaqueous electrolyte secondary battery and the conductive agent.

10. A positive electrode mixture containing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 4 and a conductive agent, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium exists between the positive electrode active material for a nonaqueous electrolyte secondary battery and the conductive agent.

11. A positive electrode mixture containing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 5 and a conductive agent, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium exists between the positive electrode active material for a nonaqueous electrolyte secondary battery and the conductive agent.

13. A nonaqueous electrolyte secondary battery including:

a strip positive electrode constituted by forming, on at least one side of a strip positive electrode current collector, a positive electrode active material layer employing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1;

a strip negative electrode constituted by forming, on at least one side of a strip negative electrode current collector, a negative electrode active material layer employing, as a negative electrode active material, a lithium metal, a lithium alloy, a carbon material capable of intercalating and deintercalating lithium ions or a compound capable of intercalating and deintercalating lithium ions; and

a strip separator;

in which;

the strip positive electrode and the strip negative electrode laminated with the strip separator between them are wound plural times to form a web of the strip positive electrode and the strip negative electrode with the strip separator intervening between them.

14. A nonaqueous electrolyte secondary battery including:

a strip positive electrode constituted by forming, on at least one side of a strip positive electrode current collector, a positive electrode active material layer employing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 2;

a strip negative electrode constituted by forming, on at least one side of a strip negative electrode current collector, a negative electrode active material layer employing, as a negative electrode active material, a lithium metal, a lithium alloy, a carbon material capable of intercalating and deintercalating lithium ions or a compound capable of intercalating and deintercalating lithium ions; and

a strip separator;

in which;

the strip positive electrode and the strip negative electrode laminated with the strip separator between them are wound plural times to form a web of the strip positive electrode and the strip negative electrode with the strip separator intervening between them.

15. A nonaqueous electrolyte secondary battery including:

a strip positive electrode constituted by forming, on at least one side of a strip positive electrode current collector, a positive electrode active material layer employing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 3;

a strip negative electrode constituted by forming, on at least one side of a strip negative electrode current collector, a negative electrode active material layer employing, as a negative electrode active material, a lithium metal, a lithium alloy, a carbon material capable of intercalating and deintercalating lithium ions or a compound capable of intercalating and deintercalating lithium ions; and

a strip separator;

in which;

the strip positive electrode and the strip negative electrode laminated with the strip separator between them are wound plural times to form a web of the strip positive electrode and the strip negative electrode with the strip separator intervening between them.

16. A nonaqueous electrolyte secondary battery including:

a strip positive electrode constituted by forming, on at least one side of a strip positive electrode current collector, a positive electrode active material layer employing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 4;

a strip negative electrode constituted by forming, on at least one side of a strip negative electrode current collector, a negative electrode active material layer employing, as a negative electrode active material, a lithium metal, a lithium alloy, a carbon material capable of intercalating and deintercalating lithium ions or a compound capable of intercalating and deintercalating lithium ions; and

a strip separator;

in which;

the strip positive electrode and the strip negative electrode laminated with the strip separator between them are wound plural times to form a web of the strip positive electrode and the strip negative electrode with the strip separator intervening between them.

17. A nonaqueous electrolyte secondary battery including:

a strip positive electrode constituted by forming, on at least one side of a strip positive electrode current collector, a positive electrode active material layer employing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 5;

a strip negative electrode constituted by forming, on at least one side of a strip negative electrode current collector, a negative electrode active material layer employing, as a negative electrode active material, a lithium metal, a lithium alloy, a carbon material capable of intercalating and deintercalating lithium ions or a compound capable of intercalating and deintercalating lithium ions; and

a strip separator;

in which;

the strip positive electrode and the strip negative electrode laminated with the strip separator between them are wound plural times to form a web of the strip positive electrode and the strip negative electrode with the strip separator intervening between them.

6. A positive electrode active material for a nonaqueous electrolyte secondary battery having at least a lithium-transition metal composite oxide of a layer structure, in which the lithium-transition metal composite oxide is at least one selected from the group consisting of lithium nickel cobaltate, lithium nickel cobalt aluminate, and lithium nickel cobalt manganate having on at least a surface thereof at least one selected from the group consisting of zirconium and magnesium.

12. A positive electrode mixture containing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 6 and a conductive agent, in which said at least one selected from the group consisting of elements which may become tetravalent and magnesium exists between the positive electrode active material for a nonaqueous electrolyte secondary battery and the conductive agent.

18. A nonaqueous electrolyte secondary battery including:

a strip positive electrode constituted by forming, on at least one side of a strip positive electrode current collector, a positive electrode active material layer employing the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 6;

a strip negative electrode constituted by forming, on at least one side of a strip negative electrode current collector, a negative electrode active material layer employing, as a negative electrode active material, a lithium metal, a lithium alloy, a carbon material capable of intercalating and deintercalating lithium ions or a compound capable of intercalating and deintercalating lithium ions; and

a strip separator;

in which;

the strip positive electrode and the strip negative electrode laminated with the strip separator between them are wound plural times to form a web of the strip positive electrode and the strip negative electrode with the strip separator intervening between them.