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

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.