ENERGY STORAGE DEVICE

• US 20100021807A1
• Filed: 07/22/2009
• Published: 01/28/2010
• Est. Priority Date: 07/24/2008
• Status: Abandoned Application

• Current Assignee: LS Mtron Limited (LS Corporation)
• Original Assignee: LS Mtron Limited (LS Corporation)
• Inventors: Kim, Jun-Ho, Lee, Ha-Young, Kang, Jin-A, Park, Jong-Suk
• Application Number:
  US12/507,651
• Publication Number:
  US 20100021807A1
• Time in Patent Office: Days
• US Class Current: 429/129
• CPC Class Codes: H01G 11/32 Carbon-based
• CPC Class Codes: H01G 11/38 Carbon pastes or blends; Binders or additives therein
• CPC Class Codes: H01G 11/46 Metal oxides
• CPC Class Codes: H01M 10/0481 Compression means other than compression means for stacks of electrodes and separators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0568 characterised by the solutes
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 2010/4292 Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/621 Binders
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/623 fluorinated polymers
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/562 characterised by the material
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 : Energy storage using capacitors

Abstract

Disclosed is an energy storage device, in which an electrode material including an aqueous solvent, a binder and a transition metal oxide containing lithium is used to form one electrode, and an electrode material including activated carbon is used to form the other electrode. In particular, the energy storage device ensures reliability and maximum capacitance efficiency by optimizing density and thickness values of the electrode materials for the cathode electrode and the anode electrode.

Claims

1. An energy storage device, comprising:

a cathode electrode and an anode electrode, each including a current collector and an electrode material;

a cathode lead wire and an anode lead wire;

a separator disposed between the cathode electrode and the anode electrode to electrically isolate the cathode electrode and the anode electrode from each other;

a housing for receiving the cathode electrode, the anode electrode and the separator;

an electrolyte filled in the housing; and

a cathode terminal and an anode terminal connected to the cathode lead wire and the anode lead wire, respectively,

wherein the electrode material of any one of the cathode electrode and the anode electrode includes an aqueous solvent, a binder for an aqueous solvent and metal oxide, and the electrode material of the other electrode includes activated carbon.

2. The energy storage device according to claim 1,

wherein a density correlation between the electrode materials satisfies the following equation,

2≦

D₁/D₂≦

4

where D₁ is the density of the electrode material including a binder for an aqueous solvent and metal oxide, and D₂ is the density of the electrode material including activated carbon.

3. The energy storage device according to claim 2,

wherein a thickness correlation between the electrodes satisfies the following equation,

1.5≦

T₂/T₁≦

3

where T₁ is the thickness of the electrode including a binder for an aqueous solvent and metal oxide, and T₂ is the thickness of the electrode including activated carbon.

4. The energy storage device according to claim 3,

wherein a density-thickness correlation between the electrode materials satisfies the following equation,

0.857≦

{D₁*(T₁−

a)}/{D₂*(T₂−

a)}≦

2.571

where D₁ and T₁ are the density of the electrode material including a binder for an aqueous solvent and metal oxide, and the thickness of the electrode using the same, respectively, D₂ and T₂ are the density of the electrode material including activated carbon, and the thickness of the electrode using the same, respectively, and ‘

a’

is the thickness of the current collector.

5. The energy storage device according to claim 1,

wherein the electrolyte contains BF₄⁻

.

6. The energy storage device according to claim 5,

wherein the metal oxide is lithium transition metal oxide.

7. The energy storage device according to claim 6,

wherein the electrolyte contains a lithium ion and an ammonium-based ion as a cation.

8. The energy storage device according to claim 7,

wherein a density correlation between the electrode materials satisfies the following equation,

2≦

D₁/D₂≦

4

where D₁ is the density of the electrode material including a binder for an aqueous solvent and metal oxide, and D₂(g/cc) is the density of the electrode material including activated carbon.

9. The energy storage device according to claim 8,

wherein a thickness correlation between the electrodes satisfies the following equation,

1.5≦

T₂/T₁≦

3

where T₁ is the thickness of the electrode including a binder for an aqueous solvent and metal oxide, and T₂ is the thickness of the electrode including activated carbon.

10. The energy storage device according to claim 9,

wherein a density-thickness correlation between the electrode materials satisfies the following equation,

0.857≦

{D₁*(T₁−

a)}/{D₂*(T₂−

a)}≦

2.571

where D₁ and T₁ are the density of the electrode material including a binder for an aqueous solvent and metal oxide, and the thickness of the electrode using the same, respectively, D₂ and T₂ are the density of the electrode material including activated carbon, and the thickness of the electrode using the same, respectively, and ‘

a’

is the thickness of the current collector.

11. The energy storage device according to claim 10,

wherein a transition metal of the transition metal oxide is any one selected from the group consisting of Ni, Mn, Co, Fe, Mo, Cr, Ti, and V.

12. The energy storage device according to claim 11,

wherein the binder for an aqueous solvent is any one selected from the group consisting of carboxymethylcellulose, alginic acid, polyvinylalcohol, polyvinylpyrrolidone, a styrene butadiene rubber dispersion and a fluorocarbon dispersion.

13. The energy storage device according to claim 1,

wherein the electrode material including the aqueous solvent, the binder for an aqueous solvent and the metal oxide is used to form the cathode electrode, and the electrode material including the activated carbon is used to form the anode electrode.