Lithium Secondary Battery Comprising Electrode Active Material Containing Surfactant

• US 20100009257A1
• Filed: 02/01/2007
• Published: 01/14/2010
• Est. Priority Date: 02/06/2006
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Hong, Kichul, Kang, Eun Ju, Woo, Jung Kyu, Lee, Hyang Mok
• Granted Patent: US 8,383,265 B2
• Time in Patent Office: Days
• US Class Current: 429/215
• 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 10/0562 Solid materials
• CPC Class Codes: H01M 10/0566 Liquid materials
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 4/1391 of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/1393 of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/624 Electric conductive fillers
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Provided is a lithium secondary battery comprising a lithium transition metal compound-containing cathode and a graphitized carbon-containing anode with addition of a surfactant to the cathode and/or the anode, whereby the addition of the surfactant improves the wettability of an electrolyte on the electrode, thereby increasing the battery capacity and improving rate properties and cycle properties of the battery, in conjunction with a significant reduction of a manufacturing process time of the battery.

Claims

1. A lithium secondary battery comprising a lithium transition metal compound-containing cathode and a graphitized carbon-containing anode, wherein a surfactant is incorporated into the cathode, the anode, or both of the cathode and the anode.

2. The battery according to claim 1, wherein the content of the surfactant is in the range of 0.01 to 20% by weight, based on the total weight of an electrode mix.

3. The battery according to claim 1, wherein the surfactant is a nonionic surfactant.

4. The battery according to claim 3, wherein the nonionic surfactant is a block copolymer having a hydrophilic portion and a hydrophobic portion.

5. The battery according to claim 4, wherein the block copolymer is a PEO-PPO block copolymer.

6. The battery according to claim 5, wherein the content of PEO unit in the PEO-PPO block copolymer is in the range of 40 to 80%, based on the total weight of the copolymer.

7. The battery according to claim 5, wherein the PEO-PPO block copolymer is a PEO-PPO-PEO triblock copolymer.

8. The battery according to claim 7, wherein the content of PEO unit in the PEO-PPO-PEO triblock copolymer is in the range of 60 to 70% by weight, based on the total weight of the copolymer.

9. The battery according to claim 1, wherein the surfactant is perfluoroalkyl sulfonate.

10. The battery according to claim 9, wherein the surfactant is perfluorobutane sulfonate.