Battery

Patent metadata

Field	Value
Publication number	US-9548486-B2
Application number	US-201615218662-A
Country	US
Kind code	B2
Filing date	Jul 25, 2016
Priority date	May 31, 2013
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A battery is provided. The battery includes a positive electrode including a positive electrode active material layer provided on a positive electrode current collector; a negative electrode; and a separator at least including a porous film, wherein the porous film has a porosity ε [%] and an air permeability t [sec/100 cc] which satisfy formulae of:

t=a ×Ln(ε)−4.02 a +100 and −1.87×1010× S −4.96≦ a ≦−40

wherein S is the area density of the positive electrode active material layer [mg/cm2] and Ln is natural logarithm.

First claim

The invention claimed is:

1. A battery, comprising:
a positive electrode including a positive electrode active material layer provided on a positive electrode current collector;
a negative electrode; and
a separator at least including a porous film,
wherein the porous film has a porosity ε [%] and an air permeability t [sec/100 cc] which satisfy formulae of:
t=a ×Ln(ε)−4.02 a+ 100

and
−1.87×1010× S− 4.96≦ a≦− 40

wherein S is the area density of the positive electrode active material layer [mg/cm 2 ] and Ln is natural logarithm.

2. The battery according to claim 1 , wherein the positive electrode active material layer has an area density less than or equal to 30 mg/cm 2 .

3. The battery according to claim 1 , wherein the positive electrode active material layer has an area density less than or equal to 50 mg/cm 2 .

4. The battery according to claim 1 , wherein the positive electrode active material layer includes a positive electrode active material, and wherein the positive electrode active material includes at least one compound selected from the group consisting of: (a) a lithium nickel composite oxide having nickel as a main component, (b) a lithium nickel cobalt manganese composite oxide, (c) a lithium manganese composite oxide having a spinel structure, and (d) a lithium iron phosphate compound having an olivine structure.

5. The battery according to claim 4 , wherein the lithium nickel composite oxide or the lithium nickel cobalt manganese composite oxide has a layer structure.

6. The battery according to claim 4 , wherein the lithium nickel composite oxide or the lithium nickel cobalt manganese composite oxide includes a halogen element.

7. The battery according to claim 4 , wherein the lithium nickel composite oxide includes nickel at greater than or equal to 50% by molar fraction.

8. The battery according to claim 4 , wherein the lithium nickel cobalt manganese composite oxide includes nickel at less than or equal to 50% by molar fraction.

9. The battery according to claim 4 , wherein
the lithium nickel composite oxide having nickel as a main component includes at least one composite oxide represented by the following formula (1):
Li x Ni y Co z M1 (1-y-z) O b   (1)

wherein M1 represents at least one element selected from the group consisting of boron (B), magnesium (Mg), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), titanium (Ti), chromium (Cr), manganese (Mn), iron (Fe), copper (Cu), zinc (Zn), gallium (Ga), germanium (Ge), yttrium (Y), zirconium (Zr), molybdenum (Mo), silver (Ag), barium (Ba), tungsten (W), indium (In), tin (Sn), lead (Pb) and antimony (Sb);
wherein x, y, z and b are values within ranges of 0.8<x≦1.2, 0.5≦y≦1.0, 0≦Z≦0.5, y+z≦1 and 1.8≦b≦2.2; and
wherein a composition of lithium varies depending on the charging and discharging state, and wherein x indicates a value in a fully-discharged state.

10. The battery according to claim 4 , wherein
the lithium nickel cobalt manganese composite oxide includes at least one composite oxide represented by the following formula (2):
Li f Ni g Co i Mn (1-g-i-h) M2 h O (2-j)   (2)

wherein M2 represents at least one element selected from the group consisting of magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), chromium (Cr), iron (Fe), copper (Cu), zinc (Zn), zirconium (Zr), molybdenum (Mo), tin (Sn), calcium (Ca), strontium (Sr) and tungsten (W);
wherein f, g, h, j and i are values within ranges of 0.8≦f≦1.2, 0<g≦0.5, 0≦h≦0.5, g+h+i<1, −0.1≦j≦0.2 and 0<i≦0.5; and
wherein a composition of lithium varies depending on the charging and discharging state, and wherein f indicates a value in a fully-discharged state.

11. The battery according to claim 4 , wherein
the lithium manganese composite oxide includes at least one composite oxide represented by the following formula (3):
Li v N i(2-w) M3 w O s   (3)

wherein M3 represents at least one element selected from the group consisting of cobalt (Co), nickel (Ni), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), chromium (Cr), iron (Fe), copper (Cu), zinc (Zn), molybdenum (Mo), tin (Sn), calcium (Ca), strontium (Sr) and tungsten (W);
wherein v, w and s are values within ranges of 0.9≦v≦1.1, 0≦w≦0.6 and 3.7≦s≦4.1; and
wherein a composition of lithium varies depending on the charging and discharging state, and wherein v indicates a value in a fully-discharged state.

12. The battery according to claim 4 , wherein
the lithium iron phosphate compound includes at least one phosphate compound represented by the following formula (4):
Li u Fe r M4 (1-r) PO 4   (4)

wherein M4 represents at least one element selected from the group consisting of cobalt (Co), manganese (Mn), nickel (Ni), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), niobium (Nb), copper (Cu), zinc (Zn), molybdenum (Mo), calcium (Ca), strontium (Sr), tungsten (W) and zirconium (Zr);
wherein r and u are values within ranges of 0<r≦1 and 0.9≦u≦1.1; and
wherein a composition of lithium varies depending on the charging and discharging state, and wherein u indicates a value in a fully-discharged state.

13. The battery according to claim 4 , wherein
the positive electrode active material contains, as the lithium nickel composite oxide having nickel as a main component, a compound of:
Li x Ni 0.80 Co 0.15 Al 0.05 O 2

wherein x is a value within a range of 0.8<x≦1.2; and
wherein a composition of lithium varies depending on the charging and discharging state, and x indicates a value in a fully-discharged state; and
wherein a content of Li x Ni 0.80 CO 0.15 Al 0.05 O 2 is 80% by mass or more and 98% by mass or less of a total mass of the positive electrode active material.

14. The battery according to claim 4 , wherein
the positive electrode active material is a mixture of the lithium nickel cobalt manganese composite oxide and the lithium manganese composite oxide, and
a mass ratio of a mass of the lithium nickel cobalt manganese composite oxide:a mass of the lithium manganese composite oxide in the mixture is in a range of from 5:5 to 9:1.

15. The battery according to claim 4 , wherein the positive electrode active material includes:
the lithium nickel composite oxide having nickel as a main component, or
a mixture of the lithium nickel composite oxide having nickel as a main component and the lithium manganese composite oxide, and
wherein a mass ratio of the lithium nickel composite oxide having nickel as a main component and the lithium manganese composite oxide in the positive electrode active material is in a range from 5:5 to 10:0.

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

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

18. The battery according to claim 1 , wherein the separator has a thickness of 3 um or more and 18 um or less.

19. The battery according to claim 1 , wherein the negative electrode includes at least one compound selected from the group consisting of carbon, silicon and tin.

20. The battery according to claim 1 , wherein the negative electrode includes a silicon alloy, wherein the silicon alloy includes at least one element selected from the group consisting of tin (Sn), nickel (Ni), copper (Cu), iron (Fe), cobalt (Co), manganese (Mn), zinc (Zn), indium (In), silver (Ag

Assignees

• Sony Corp

Inventors

• Abe Tomohiro
• Suzuki Motomi

Classifications

• B60L53/52

  Wind-driven generators · CPC title

• B60L53/51

  Photovoltaic means · CPC title

• H01M10/486

  for measuring temperature · CPC title

• H01M4/131 Primary

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

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title