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

Patent metadata

Field	Value
Publication number	US-2017149049-A1
Application number	US-201515316259-A
Country	US
Kind code	A1
Filing date	May 18, 2015
Priority date	Jun 26, 2014
Publication date	May 25, 2017
Grant date	—

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

1 . A positive electrode containing a first active material and a second active material,
in which 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[%], and an average particle diameter D2 of the second active material satisfies 1 [μm]≦D2≦6 [μm].

2 . The positive electrode according to claim 1 , having an average composition of the lithium composite oxide represented by the following formula (1).
Li 1+a (Mn b Co c Ni 1-b-c ) 1−a M3 d O 2-e   (1)
(Provided that M3 is at least one of aluminum (Al), magnesium (Mg), zirconium (Zr), titanium (Ti), barium (Ba), boron (B), silicon (Si), and iron (Fe), and 0<a<0.25, 0.3≦b<0.7, 0≦c<1−b, 0≦d≦1, and 0≦e≦1 are satisfied.)

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

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

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

6 . The positive electrode according to claim 2 , wherein M3 in formula (1) above is least one of aluminum (Al), magnesium (Mg), and titanium (Ti).

7 . 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 10[%]≦V1≦30[%], and an average particle diameter D1 of the first active material satisfies 6 [μm]≦D1≦20 [μm], and the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 0[%]≦V2≦10[%], and an average particle diameter D2 of the second active material satisfies 1 [μm]≦D2≦6 [μm].

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

9 . The battery according to claim 7 , wherein the negative electrode contains silicon oxide.

10 . The battery according to claim 7 , wherein an open-circuit voltage in a full charge state per a pair of the positive electrode and the negative electrode is 4.4 V or more and 6.00 V or less.

11 . 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 10[%]≦V1≦30[%], and an average particle diameter D1 of the first active material satisfies 6 [μm]≦D1≦20 [μm], and the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 0[%]≦V2≦10[%], and an average particle diameter D2 of the second active material satisfies 1 [μm]≦D2≦6 [μm].

12 . 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 10[%]≦V1≦30[%], and 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[%], and an average particle diameter D2 of the second active material satisfies 1 [μm]≦D2≦6 [μm], and the electronic device receives electric power from the battery.

13 . An electric vehicle comprising:
a battery; a converter for converting electric power supplied from the battery into a driving force of a vehicle; and a controller for performing information processing on vehicle control on the basis of information on the battery, wherein the battery contains a positive electrode, a negative electrode, and an electrolyte, 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 10[%]≦V1≦30[%], and an average particle diameter D1 of the first active material satisfies 6 [μm]≦D1≦20 [μm], and the second active material has a particulate shape, an average porosity V2 in a particle of the second active material satisfies 0[%]≦V2≦10[%], and an average particle diameter D2 of the second active material satisfies 1 [μm]≦D2≦6 [μm].

14 . 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 10[%]≦V1≦30[%], and 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[%], and an average particle diameter D2 of the second active material satisfies 1 [μm]≦D2≦6 [μm], and the electricity storage device supplies electric power to an electronic device connected to the battery.

15 . The electricity storage device according to claim 14 , further comprising an electric power information control device for transmitting a signal to or receiving a signal from another device via a network, wherein the electricity storage device performs charge-discharge control of the battery on the basis of information received by the electric power information control device.

16 . 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 se

Assignees

• Sony Corp

Inventors

• Endoh Kazuaki
• Motohashi Kazunari
• Hayashi Naoki

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• Y10S903/903

  having energy storing means, e.g. battery, capacitor · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M2300/004

  Three solvents · CPC title