Electrode assembly, method for producing same, and secondary battery including same

Patent metadata

Field	Value
Publication number	US-2019355952-A1
Application number	US-201816485415-A
Country	US
Kind code	A1
Filing date	Feb 5, 2018
Priority date	Feb 22, 2017
Publication date	Nov 21, 2019
Grant date	—

Abstract

The present disclosure relates to an electrode assembly, a method for producing the same, and a secondary battery including the same, the electrode assembly comprising: a negative electrode, in which a negative electrode current collecting layer, a negative electrode active material layer, and an insulation layer are sequentially laminated; a positive electrode; and a separator disposed between the negative electrode and the positive electrode, wherein a porosity of the insulation layer is 50% to 75%.

First claim

1 . An electrode assembly comprising
a negative electrode, in which a negative electrode current collecting layer, a negative active material layer, and an insulation layer are sequentially laminated; a positive electrode; and a separator disposed between the negative electrode and the positive electrode, wherein a porosity of the insulation layer is 50% to 75%.

2 . The electrode assembly of claim 1 , wherein the insulation layer has a woven structure.

3 . The electrode assembly of claim 1 , wherein the insulation layer comprises a polymer and ceramic particulates.

4 . The electrode assembly of claim 3 , wherein a mixing ratio of the polymer and the ceramic particulates is 20:80 to 85:15.

5 . The electrode assembly of claim 3 , wherein an average particle diameter of the ceramic particulates is within a range of 0.1 μm to 4 μm.

6 . The electrode assembly of claim 3 , wherein the polymer is at least one selected from the group consisting of a copolymer of polyvinylidene fluoride and hexafluoropropylene (polyvinylidene fluoride-co-hexafluoropropylene, PVDF-HFP), polyacrylonitrile (PAN), polyimide (PI), polyethyleneimide (PEI), polypropylene (PP), polycarbonate (PC), and thermoplastic polyurethane (TPU).

7 . The electrode assembly of claim 3 , wherein the ceramic particulates are at least one selected from the group consisting of alumina (Al 2 O 3 ), zirconia (ZrO 2 ), titanium oxide (TiO 2 ), and silica (SiO 2 ).

8 . The electrode assembly of claim 1 , wherein the insulation layer is integrally formed with the negative active material layer.

9 . A method of producing an electrode assembly, comprising
forming an insulation layer on a negative electrode current collecting layer on which a negative active material layer is formed to produce a negative electrode; producing a positive electrode; and forming a separator between the negative electrode and the positive electrode, wherein the insulation layer is formed using an electrospinning method.

10 . The method of producing an electrode assembly of claim 9 , wherein the electrospinning is performed using a mixture of a polymer and ceramic particulates.

11 . The method of producing an electrode assembly of claim 10 , wherein a mixing ratio of the polymer and the ceramic particulates is 20:80 to 85:15.

12 . A secondary battery comprising
an electrode assembly of claim 1 ; and
an exterior material configured to accommodate the electrode assembly.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Yoon Yeonhee
• Nam Junghyun
• Seok Hoon
• Yoo Heeeun
• Jeon Bokkyu
• JIN Mokyun

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/622

  being polymers · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title