Battery, battery pack, electronic apparatus, electrically driven vehicle, electrical storage device, and power system

Patent metadata

Field	Value
Publication number	US-9647256-B2
Application number	US-201414650441-A
Country	US
Kind code	B2
Filing date	Aug 21, 2014
Priority date	Oct 15, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

Provided is a battery in which an area density S (mg/cm 2 ) of a positive electrode active material layer is 27 mg/cm 2 or greater, and a porous film included in a separator has a structure satisfying the following Expressions.

0.04≦ Ri ≦−0.07 L −0.09× S +4.99

Ri=τ 2 L/ε′

ε′=[{( L ×ε/100)− Rz ×0.46/3}/ L ]×100

τ={(1.216×ε′ Td ×10 −4 )/ L} 0.5   (Expressions)

First claim

The invention claimed is:

1. A battery, comprising:
a positive electrode that includes a positive electrode current collector, and a positive electrode active material layer which includes a positive electrode active material and is provided on both surfaces of the positive electrode current collector;
a negative electrode;
a separator that includes at least a porous film; and
an electrolyte,
wherein the positive electrode active material includes a positive electrode material including a lithium cobalt composite oxide which has a layered structure and includes at least lithium and cobalt,
an area density S (mg/cm 2 ) of the positive electrode active material layer is 27 mg/cm 2 or greater, and
the porous film satisfies the following Expressions:
0.04≦ Ri≦− 0.07 L− 0.09× S+ 4.99

Ri=τ 2 L/ε′
ε′=[{( L×ε/ 100)− Rz× 0.46/3}/ L]× 100

τ={(1.216×ε′ Td× 10 −4 )/ L} 0.5   (Expressions)

[provided that, Ri: a film leakage resistance (μm), L: a film thickness (μm), τ: a tortuosity factor, T: air permeability (sec/100 cc), d: a pore size (nm), Rz: a surface roughness maximum height (the sum of values of a front surface and a rear surface) (μm), ε: porosity (%), ε′: corrected porosity (%), and S: the area density of the positive electrode active material layer (mg/cm 2 )].

2. The battery according to claim 1 ,
wherein the electrolyte includes an electrolyte solution and a polymer compound, and the electrolyte is a gel-type electrolyte in which the electrolyte solution is retained by the polymer compound.

3. The battery according to claim 2 ,
wherein the electrolyte further includes particles.

4. The battery according to claim 1 ,
wherein the area density S (mg/cm 2 ) of the positive electrode active material layer is 51 mg/cm 2 or less.

5. The battery according to claim 1 ,
wherein the thickness of the separator is 3 μm to 17 μm.

6. The battery according to claim 1 ,
wherein the positive electrode material is a coating particle that further includes a coating layer provided at least on a part of a surface of a particle of the lithium cobalt composite oxide.

7. The battery according to claim 1 ,
wherein the lithium cobalt composite oxide is at least one kind of a lithium cobalt composite oxide expressed by General Formula (Chem. 1):
Li p Co (1-q) M1 q O (2-y) X z   (Chem. 1)

(In Formula, M1 represents at least one kind excluding cobalt (Co) among elements selected from Group 2 to Group 15, and X represents at least one kind excluding oxygen (O) among elements in Group 16 and elements in Group 17, and p, q, y, and z are values in ranges of 0.9≦p≦1.1, 0≦q<0.5, −0.10≦y≦0.20, and 0≦z≦0.1).

8. The battery according to claim 1 ,
wherein the separator further includes a surface layer which is provided at least on one main surface of the porous film and which includes particles and a resin.

9. The battery according to claim 1 ,
wherein the porous film is a polyolefin resin film.

10. The battery according to claim 1 ,
wherein the thickness of the separator is −0.0873S 2 +6.9788S−122.66 μm or less.

11. The battery according to claim 1 ,
wherein the positive electrode, the negative electrode, the separator, and the electrolyte are accommodated in a film-shaped exterior packaging member.

12. The battery according to claim 1 ,
wherein the open-circuit voltage in a fully charged state per a pair of the positive electrode and the negative electrode is 4.25 V or higher.

13. A battery pack, comprising:
the battery according to claim 1 ;
a control unit that controls the battery; and
an exterior packaging member in which the battery is accommodated.

14. An electronic apparatus, comprising:
the battery according to claim 1 ,
wherein electric power is supplied from the battery.

15. An electrically driven vehicle, comprising:
the battery according to claim 1 ;
a converting device to which electric power is supplied from the battery, and which converts the electric power to a driving force of a vehicle; and
a control device that performs information processing relating to vehicle control on the basis of information relating to the battery.

16. An electrical storage device, comprising:
the battery according to claim 1 ,
wherein the electrical storage device supplies electric power to an electronic apparatus that is connected to the battery.

17. The electrical storage device according to claim 16 , further comprising:
a power information control device that transmits and receives a signal to and from other apparatuses through a network,
wherein charging and discharging control of the battery is performed on the basis of information that is received by the power information control device.

18. A power system,
wherein electric power is supplied from the battery according to claim 1 , or electric power is supplied to the battery from a power generating device or a power network.

Assignees

• Sony Corp

Inventors

• Abe Tomohiro
• Takagi Kentaro

Classifications

• H02J7/663

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title

• H02J7/70

  characterised by the mechanical construction · CPC title

• H02J7/63

  against overdischarge · CPC title

• H02J7/61

  against overcharge · CPC title

• H02J7/64

  against overvoltage · CPC title