LITHIUM ION RECHARGEABLE BATTERY, LITHIUM ION CAPACITOR, ANDMETHOD OF MANUFACTURING SAID LITHIUM-ION RECHARGEABLEBATTERY AND LITHIUM ION CAPACITOR
A lithium ion rechargeable battery includes an electrode assembly and an electrolyte solution. A negative electrode includes a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode. The negative electrode is doped with lithium. An aperture ratio of the negative electrode current collector is 0% or higher and 0.1% or lower. A discharge capacity ratio X, which is defined by Formula (1): X=C1/C2, is greater than 0, and 0.9 or less. C1 in the Formula (1) is a discharge capacity of a cell when the cell is charged and discharged at a cell voltage between 2.0 V and 4.3 V. C2 in the Formula (1) is a discharge capacity of the negative electrode when the negative electrode is charged and discharged between 0V vs. Li/Li+ and 3V vs. Li/Li+.
1 . A lithium ion rechargeable battery comprising:
an electrode assembly comprising:
a positive electrode; and
a negative electrode; and
an electrolyte,
wherein the negative electrode comprises a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode current collector,
wherein the negative electrode is doped with lithium,
wherein an aperture ratio of the negative electrode current collector is from 0% to 0.1%,
wherein a discharge capacity ratio X is greater than 0, and 0.9 or lower, the discharge capacity ratio X being defined by Formula (1): X=C1/C2,
wherein C1 is a discharge capacity of a cell when the cell is charged and discharged at a cell voltage between 2.0 V 4.3 V, and
wherein C2 is a discharge capacity of the negative electrode when the negative electrode is charged and discharged between 0V vs. Li/Li+ and 3V vs. Li/Li+.
2 . The lithium ion rechargeable battery according to claim 1 ,
wherein a discharge capacity ratio Y is from 0.7 to 1, the discharge capacity ratio Y being defined by Formula (2): Y=C3/C2, and
wherein C3 is a discharge capacity of the negative electrode when the negative electrode is discharged, the negative electrode being removed from the cell that is charged in a constant current-constant voltage mode at a cell voltage of 4.3 V.
3 . The lithium ion rechargeable battery according to claim 1 ,
wherein the negative electrode active material layer comprises a silicon-based material, and
wherein a content of the silicon-based material in the negative electrode active material layer is from 5% by mass to 99% by mass.
4 . The lithium ion rechargeable battery according to claim 1 ,
wherein a coating weight of the negative electrode active material layer is from 5 g/m 2 to 500 g/m 2 .
5 . The lithium ion rechargeable battery according to claim 1 ,
wherein a thickness of the negative electrode active material layer is from 3 μm to 300 μm.
6 . The lithium ion rechargeable battery according to claim 1 ,
wherein a ratio of doping the negative electrode active material layer with lithium is from 5% to 95% relative to a value of C2.
7 . A method of manufacturing a lithium ion rechargeable battery with an electrode cell, the method comprising:
doping a negative electrode with lithium, the negative electrode comprising: a negative electrode current collector; and
a negative electrode active material layer formed on a surface of the negative electrode current collector; and
stacking the negative electrode, doped with lithium, and a positive electrode to form the electrode cell,
wherein an aperture ratio of the negative electrode current collector is from 0% to 0.1%,
wherein a discharge capacity ratio X is from 0.2 to 0.9, the discharge capacity ratio X being defined by Formula (1): X=C1/C2,
wherein C1 is a discharge capacity of a cell when the cell is charged and discharged at a cell voltage between 2.0 V and 4.3 V, and
wherein C2 is a discharge capacity of the negative electrode when the negative electrode is charged and discharged between 0V vs. Li/Li+ and 3 V vs. Li/Li+.
8 . A lithium ion capacitor comprising:
an electrode assembly comprising:
a positive electrode; and
a negative electrode; and
an electrolyte,
wherein the negative electrode comprises a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode current collector,
wherein the negative electrode is doped with lithium,
wherein an aperture ratio of the negative electrode current collector is from 0% to 0.1%,
wherein a discharge capacity ratio X is from 0.005 to 0.2, the discharge capacity ratio X being defined by Formula (3): X=C1/C2,
wherein C1 is a discharge capacity of a cell when the cell is charged and discharged at a cell voltage between 2.2 V and 3.8 V, and
wherein C2 is a discharge capacity of the negative electrode when the negative electrode is charged and discharged between 0V vs. Li/Li+ and 3V vs. Li/Li+.
9 . The lithium ion capacitor according to claim 8 ,
wherein the negative electrode active material layer comprises a silicon-based material, and
wherein a content of the silicon-based material in the negative electrode active material layer is from 30% by mass to 99% by mass.
10 . The lithium ion capacitor according to claim 8 ,
wherein the negative electrode active material layer comprises a carbon-based material, and
a content of the carbon-based material in the negative electrode active material layer is from 80% by mass to 99% by mass.
11 . The lithium ion capacitor according to claim 10 , wherein the carbon-based material is graphite-based particles.
12 . The lithium ion capacitor according to claim 9 , wherein a ratio of doping the negative electrode active material layer with lithium is from 30% to 95% of a value of C2.
13 . A method of manufacturing a lithium ion capacitor with an electrode assembly comprising a negative electrode, an electrode different from the negative electrode and with an electrolyte, the method comprising:
doping the negative electrode with lithium; and
stacking the negative electrode, doped with lithium, and the electrode different from the negative electrode to form the electrode assembly,
wherein the negative electrode comprises a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode current collector,
wherein an aperture ratio of the negative electrode current collector is from 0% to 0.1%,
wherein a discharge capacity ratio from X is 0.005 to 0.2, the discharge capacity ratio X being defined by Formula (3): X=C1/C2,
wherein C1 is a discharge capacity of a cell when the cell is charged and discharged at a cell voltage between 2.2 V and 3.8 V,
wherein C2 is a discharge capacity of the negative electrode when the negative electrode is charged and discharged between 0V vs. Li/Li+ and 3V vs. Li/Li+, and
wherein a unit of C1 and C2 values is expressed in mAh/g.
14 . The lithium ion capacitor according to claim 10 , wherein a ratio of doping the negative electrode active material layer with lithium is from 30% to 95% of a value of C2.