Cathode material for lithium-air battery and method of manufacturing cathode using same

Patent metadata

Field	Value
Publication number	US-2023369685-A1
Application number	US-202318358535-A
Country	US
Kind code	A1
Filing date	Jul 25, 2023
Priority date	Jun 17, 2020
Publication date	Nov 16, 2023
Grant date	—

Abstract

The present invention relates to a cathode material for a lithium-air battery and a method of manufacturing a cathode using the same. The cathode material of the present invention includes a solvent component and thus includes an electrolyte in a small amount compared to a conventional cathode material, thereby reducing the weight of a cathode manufactured using the cathode material, ultimately increasing the energy density of a lithium-air battery including the cathode.

First claim

1 .- 13 . (canceled)

14 . A cathode, comprising:
a current collector; and a cathode layer formed on the current collector and comprising a cathode material, wherein the cathode material comprises a carbon material, an electrolyte, and a binder, wherein the electrolyte comprises a lithium salt and an ionic liquid, and wherein the cathode layer has a thickness of 700 to 1000 μm.

15 . The cathode of claim 14 , wherein the carbon material comprises one or more selected from the group consisting of carbon nanotubes (CNTs), carbon nanofibers, carbon nanobelts and mixtures thereof.

16 . The cathode of claim 14 , wherein the ionic liquid comprises one or more selected from the group consisting of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI), diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]), dimethylpropylammonium trifluoromethanesulfonate ([dmpa][TfO]), diethylmethylammonium trifluoromethanesulfonylimide ([dema][TFSI]), methylpropylpiperidinium trifluoromethanesulfonylimide ([mpp][TFSI]) and mixtures thereof.

17 . The cathode of claim 14 , wherein the cathode comprises a carbon material loaded in an amount of 3.00 to 6.00 mg/cm 2 .

18 . The cathode of claim 14 , wherein the binder comprises poly(diallyldimethylammonium) bis (trifluoromethanesulfonyl)imide (PDDA-TFSI).

19 . The cathode of claim 14 , wherein an amount of the binder is 15 to 25 parts by weight based on 100 parts by weight of the carbon material.

20 . The cathode of claim 14 , wherein a mass ratio of the carbon material and the electrolyte is 1:2-20.

21 . A method of manufacturing a cathode, comprising:
preparing a cathode slurry comprising a cathode material; forming a cathode layer by applying the cathode slurry on a current collector; and heat-treating the cathode layer, wherein the cathode material comprises a carbon material, an electrolyte, a solvent component and a binder, wherein the electrolyte comprises a lithium salt and an ionic liquid, and wherein the cathode layer has a thickness of 700 to 1000 μm.

22 . The method of claim 21 , wherein the solvent component comprises N-methyl-2-pyrrolidone (NMP).

23 . The method of claim 21 , wherein the heat-treating is performed in a vacuum at room temperature for 22 to 48 hr.

24 . The method of claim 21 , wherein a mass ratio of the carbon material and the electrolyte is 1:2-20.

25 . The method of claim 21 , wherein an amount of the solvent component is 50 to 250 mL per g of the carbon material.

26 . A lithium-air battery, comprising:
the cathode of claim 14 ; an anode enabling deposition and dissociation of lithium; and a polymer electrolyte interposed between the cathode and the anode.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Seoul Nat Univ R&Db Foundation

Inventors

• Son Sam Ick
• Bae Young Joon
• Park Hyeok Jun
• Kang Ki Suk
• Ko Young Min
• Park Sung Kwan

Classifications

• H01M12/08 Primary

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title