Electrode tab coated with electrical insulating layer and secondary battery comprising the same

• US 10,454,090 B2
• Filed: 10/16/2015
• Issued: 10/22/2019
• Est. Priority Date: 10/16/2014
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Jin, Sun-Mi, Yu, In-Gyoung, Lee, Joo-Sung
• Primary Examiner(s): Domone, Christopher P
• Application Number:
  US15/108,938
• Publication Number:
  US 20160329547A1
• Time in Patent Office: 1,467 Days
• Field of Search: None
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 10/058 Construction or manufacture
• CPC Class Codes: H01M 2200/00 Safety devices for primary or secondary batteries
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/105 Pouches or flexible bags
• CPC Class Codes: H01M 50/534 characterised by the material of the leads or tabs
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/553 Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: H01M 50/579 in response to shock
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

An electrode tab coated with an electrical insulating layer according to one aspect of the present disclosure, and a secondary battery comprising the same can provide further enhanced electrical insulating effect.

Claims

1. An electrode tab coated with an electrical insulating layer comprising an inorganic filler, an aqueous binder, and a slurry stabilizer, wherein the electrode tab extends from an electrode current collector, and an electrode lead connected to a connecting portion at the distal end of the electrode tab, and wherein the electrical insulating layer is formed on the entire electrode tab, except for the connecting portion, with a thickness less than that of an active material layer formed on the electrode current collector.

2. The electrode tab of claim 1, wherein the electrical insulating layer has a thickness in a range of 5% to 100% of the active material layer.

3. The electrode tab of claim 1, wherein the electrical insulating layer has a thickness in a range of 10% to 50% of the active material layer.

4. The electrode tab of claim 1, wherein the inorganic filler is one or at least two selected from the group consisting of SiO₂, TiO₂, Al₂O₃, AlOOH, γ

-AlOOH, ZrO₂, SnO₂, CeO₂, MgO, CaO, ZnO, Y₂O₃, Pb(Zr,Ti)O₃ (PZT), Pb<sub>1−

x</sub>La_xZr_1-yTiO₃ (PLZT), PB(Mg_1/3Nb_2/3)O₃—

PbTiO₃ (PMN-PT), BaTiO₃, hafnia (HfO₂) and SrTiO₃.

5. The electrode tab of claim 1, wherein the aqueous binder is one or at least two selected from the group consisting of styrene-butadiene rubber, acrylated styrene-butadiene rubber, acrylonitrile-butadiene rubber, acrylonitrile-butadiene-styrene rubber, acrylic rubber, butyl rubber, fluoro rubber, polytetrafluoroethylene, polyethylene, polypropylene, ethylenepropylene copolymer, polyethylene oxide, polyvinylpyrrolidone, polyepichlorohydrin, polyphosphazenes, polyacrylonitrile, polystyrene, ethylene propylene diene copolymer, polyvinylpyrridine, chlorosulfonated polyethylene, latex, polyester resin, acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, hydroxypropyl methylcellulose, hydroxypropyl cellulose and diacetyl cellulose.

6. The electrode tab of claim 1, wherein the slurry stabilizer is carboxymethyl cellulose, carboxyethyl cellulose, or derivatives thereof.

7. The electrode tab of claim 1, wherein the inorganic filler and the binder are contained at a weight ratio of 5:

95 to 80;

20.

8. The electrode tab of claim 1, wherein the slurry stabilizer is used in an amount of 0.1 wt % to 5 wt % with respect to the inorganic filler.

9. The electrode tab of claim 1, wherein the electrode tab is a positive electrode tab.

10. A secondary battery comprising the electrode tab as set forth in claim 1.

11. The secondary battery of claim 10, wherein the secondary battery is a lithium secondary battery.

12. The secondary battery of claim 10, wherein the secondary battery is a prismatic secondary battery or pouch-shaped secondary battery.