Battery, battery pack, electronic apparatus, electric vehicle, electrical storage apparatus and electricity system
View Patent ↗There is provided a battery including a positive electrode, a negative electrode, a separator at least including a porous film, and an electrolyte. The positive electrode includes a positive electrode current collector having a pair of surfaces, and a positive electrode active material layer provided on each of the surfaces of the positive electrode current collector. The positive electrode active material layer contains a positive electrode active material. The positive electrode active material layer has an area density S [mg/cm2] more than or equal to 30 mg/cm2. The porous film included in the separator has a porosity ε [%] and an air permeability t [sec/100 cc] which satisfy a predetermined formula.
1. A battery, comprising:
a positive electrode including a positive electrode current collector having a pair of surfaces, and a positive electrode active material layer provided on each of the surfaces of the positive electrode current collector, the positive electrode active material layer containing a positive electrode active material,
the positive electrode active material having at least one compound selected from the group consisting of:
a lithium nickel composite oxide having nickel as a main component, the lithium nickel composite oxide having a layer structure, the lithium nickel composite oxide containing at least lithium and nickel with a high content of nickel;
a lithium nickel cobalt manganese composite oxide having a layer structure, the lithium nickel cobalt manganese composite oxide containing at least lithium, nickel, cobalt and manganese with a low content of nickel;
a lithium manganese composite oxide having a spinel structure, the lithium manganese composite oxide containing at least lithium and manganese; and
a lithium iron phosphate compound having an olivine structure, the lithium iron phosphate compound containing at least lithium, iron and phosphorus,
the positive electrode active material layer having an area density S [mg/cm2] more than or equal to 30 mg/cm2;
a negative electrode;
a separator at least including a porous film,
the porous film having 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
where ε is the porosity [%], t is the air permeability [sec/100 cc], S is the area density of the positive electrode active material layer [mg/cm2] and Ln is natural logarithm; and
an electrolyte.
2. The battery according to claim 1 , wherein
the positive electrode active material layer has an area density less than or equal to 50 mg/cm2.
3. The battery according to claim 1 , 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)
where 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);
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
the composition of lithium varies depending on the charging and discharging state, and the value of x indicates the value in the fully-discharged state.
4. The battery according to claim 1 , 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)
where 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);
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
the composition of lithium varies depending on the charging and discharging state, and the value of f indicates the value in the fully-discharged state.
5. The battery according to claim 1 , wherein
the lithium manganese composite oxide includes at least one composite oxide represented by the following formula (3):
Li v Ni(2- w )M3 w Os (3)
where 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);
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
the composition of lithium varies depending on the charging and discharging state, and the value of v indicates the value in the fully-discharged state.
6. The battery according to claim 1 , 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 )PO4 (4)
where 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);
r and u are values within ranges of 0<r≦1 and 0.9≦u≦1.1; and
the composition of lithium varies depending on the charging and discharging state, and the value of u indicates the value in the fully-discharged state.
7. The battery according to claim 1 , wherein
the positive electrode active material contains, as the lithium nickel composite oxide having nickel as a main component, a compound of:
Li x Ni0.80Co0.15Al0.05O2
where x is a value within a range of 0.8<x≦1.2; and
the composition of lithium varies depending on the charging and discharging state, and the value of x indicates the value in the fully-discharged state; and
a content of LixNi0.80Co0.15Al0.05O2 is 80% by mass or more and 98% by mass or less of a total mass of the positive electrode active material.
8. The battery according to claim 1 , 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.
9. The battery according to claim 1 , wherein
the positive electrode active material is
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
a mass ratio of a mass of the lithium nickel composite oxide having nickel as a main component: a mass of the lithium manganese composite oxide in the positive electrode active material is in a range of from 5:5 to 10:0.
10. The battery according to claim 1 , wherein
the porous film has at least one main surface, and
the separator further includes a surface layer containing particles and a resin, provided on at least one surface of the porous film.
11. The battery according to claim 1 , wherein
the porous film is a polyolefin resin film.
12. The battery according to claim 1 , wherein
the separator has a thickness of 3 μm or more and 18 μm or less.
13. A battery pack, comprising:
the battery according to claim 1 ;
a control unit configured to control the battery; and
an exterior configured to contain the battery.
14. An electronic apparatus, comprising:
the battery according to claim 1 , the electronic apparatus being configured to receive electricity supply from the battery.
15. An electric vehicle, comprising:
the battery according to claim 1 ;
a converter configured to
receive electricity supply from the battery and
convert the electricity into driving force for vehicle; and
a controller configured to process information on vehicle control on the basis of information on the battery.
16. An electrical storage apparatus, comprising:
the battery according to claim 1 ,
the electrical storage apparatus being configured to provide electricity to an electronic apparatus connected to the battery.
17. The electrical storage apparatus according to claim 16 , further comprising:
an electricity information controlling device configured to transmit and receive signals via a network to and from other apparatus,
the electrical storage apparatus being configured to control charge and discharge of the battery on the basis of information that the electricity information controlling device receives.
18. An electricity system, configured to
receive electricity supply from the battery according to claim 1 ; or
provide electricity from at least one of a power generating device and a power network to the battery.