Positive electrode, battery, battery pack, electronic device, electric vehicle, electricity storage device, and electric power system

Patent metadata

Field	Value
Publication number	US-10784498-B2
Application number	US-201515316259-A
Country	US
Kind code	B2
Filing date	May 18, 2015
Priority date	Jun 26, 2014
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

A positive electrode contains a first active material and a second active material. The first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals. The first active material has a particulate shape. An average porosity V1 in a particle of the first active material satisfies 10[%]≤V1≤30[%]. An average particle diameter D1 of the first active material satisfies 6 [μm]≤D1≤20 [μm]. The second active material has a particulate shape. An average porosity V2 in a particle of the second active material satisfies 0[%]≤V2≤10[%]. An average particle diameter D2 of the second active material satisfies 1 [μm]≤D2≤6 [μm].

First claim

The invention claimed is:

1. A positive electrode, containing:
a first active material; and
a second active material,
wherein
the first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals,
the first active material has a particulate shape, an average porosity V1 in a particle of the first active material satisfies 11[%]≤V1≤25[%], and an average particle diameter D1 of the first active material satisfies 7 [μm]≤D1≤18.8 [μm], and
the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 1[%]≤V2≤9[%], and an average particle diameter D2 of the second active material satisfies 1.1 [μm]≤D2≤5.5 [μm].

2. The positive electrode according to claim 1 , wherein the first active material has a void having an annual ring shape in the particle.

3. The positive electrode according to claim 1 , wherein a weight ratio between the first active material and the second active material is 95:5 or more and 70:30 or less.

4. The positive electrode according to claim 1 , wherein the first active material has a void distributed throughout an inside of the particle.

5. The positive electrode according to claim 4 , wherein the void has a plurality of annular void layers of different diameters that surround a center of the particle of the first active material.

6. A battery, comprising:
a positive electrode;
a negative electrode; and
an electrolyte, wherein
the positive electrode contains a first active material and a second active material,
the first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals,
the first active material has a particulate shape, an average porosity V1 in a particle of the first active material satisfies 11[%]≤V1≤25[%], and an average particle diameter D1 of the first active material satisfies 7 [μm]≤D1≤18.8 [μm], and
the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 1[%]≤V2≤9[%], and an average particle diameter D2 of the second active material satisfies 1.1 [μm]≤D2≤5.5 [μm].

7. The battery according to claim 6 , wherein the negative electrode contains at least one of silicon (Si) or tin (Sn).

8. The battery according to claim 6 , wherein the negative electrode contains silicon oxide.

9. The battery according to claim 6 , wherein an open-circuit voltage in a full charge state of a pair of the positive electrode and the negative electrode is in a range of 4.4 V to 6.00 V.

10. A battery pack, comprising:
a battery containing:
a positive electrode;
a negative electrode; and
an electrolyte, wherein
the positive electrode contains a first active material and a second active material,
the first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals,
the first active material has a particulate shape, an average porosity V1 in a particle of the first active material satisfies 11[%]≤V1≤25[%], and an average particle diameter D1 of the first active material satisfies 7 [μm]≤D1≤18.8 [μm], and
the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 1[%]≤V2≤9[%], and an average particle diameter D2 of the second active material satisfies 1.1 [μm]≤D2≤5.5 [μm].

11. An electronic device, comprising:
a battery containing:
a positive electrode;
a negative electrode; and
an electrolyte, wherein
the positive electrode contains a first active material and a second active material,
the first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals,
the first active material has a particulate shape, an average porosity V1 in a particle of the first active material satisfies 11[%]≤V1≤25[%], and an average particle diameter D1 of the first active material satisfies 7 [μm]≤D1≤18.8 [μm],
the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 1[%]≤V2≤9[%], and an average particle diameter D2 of the second active material satisfies 1.1 [μm]≤D2≤5.5 [μm], and
the electronic device is configured to receive electric power from the battery.

12. An electric vehicle, comprising:
a battery;
a converter configured to convert electric power supplied from the battery into a driving force of the electric vehicle; and
a controller configured to process information for vehicle control based on information of the battery, wherein
the battery contains:
a positive electrode;
a negative electrode; and
an electrolyte, wherein
the positive electrode contains a first active material and a second active material,
the first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals,
the first active material has a particulate shape, an average porosity V1 in a particle of the first active material satisfies 11[%]≤V1≤25[%], and an average particle diameter D1 of the first active material satisfies 7 [μm]≤D1≤18.8 [μm], and
the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 1[%]≤V2≤9[%], and an average particle diameter D2 of the second active material satisfies 1.1 [μm]≤D2≤5.5 [μm].

13. An electricity storage device, comprising:
a battery containing:
a positive electrode;
a negative electrode; and
an electrolyte, wherein
the positive electrode contains a first active material and a second active material,
the first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals,
the first active material has a particulate shape, an average porosity V1 in a particle of the first active material satisfies 11[%]≤V1≤25[%], and an average particle diameter D1 of the first active material satisfies 7 [μm]≤D1≤18.8 [μm],
the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 1[%]≤V2≤9[%], and an average particle diameter D2 of the second active material satisfies 1.1 [μm]≤D2≤5.5 [μm], and
the electricity storage device is configured to supply electric power to an electronic device connected to the battery.

14. The electricity storage device according to claim 13 , further comprising an electric power information control device configured to transmit a first signal to or receive a second signal from another device via a network, wherein the electricity storage device is configured to control charge-discharge of the battery based on information received by the electric power information control device.

15. An electric power system, comprising:
a battery containing:
a positive electrode;
a negative electrode; and
an electrolyte, wherein
the positive electrode contains a first active material and a second active material,
the first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals,
the first active material has a particulate shape, an average porosity V1

Assignees

• Murata Manufacturing Co

Inventors

• Endoh Kazuaki
• Motohashi Kazunari
• Hayashi Naoki

Classifications

• H01M4/387

  Tin or alloys based on tin · CPC title

• H01M2010/4292

  Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M50/417

  Polyolefins · CPC title