Method for manufacturing iron-chromium oxide using ion exchange resin

Patent metadata

Field	Value
Publication number	US-12559384-B2
Application number	US-202017777695-A
Country	US
Kind code	B2
Filing date	Nov 30, 2020
Priority date	Nov 29, 2019
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

The present invention relates to a method of preparing an iron-chromium oxide using an ion-exchange resin. Moreover, the present invention relates to a method of preparing an iron-chromium oxide that can be used as a cathode material for lithium-ion batteries. According to one aspect of the present invention, it has the effect of providing a cathode material for lithium-ion batteries with a high capacitance, while exhibiting a voltage similar to that of a transition-metal oxide (2-4.5 V vs Li+/Li).

First claim

The invention claimed is:

1 . A method of preparing an iron-chromium oxide, comprising:
providing an ion exchange column substituted with Fe 3+ ions; adding a hexavalent chromium (Cr 6+ ) compound to the ion exchange resin column to obtain an ion-exchanged aqueous solution; and heat-treating the ion-exchanged aqueous solution, wherein the heat-treating is performed at 270° C. to 350° C.

2 . The method according to claim 1 , wherein, in the providing the ion exchange column substituted with Fe 3+ ions, the ion exchange column substituted with Fe 3+ ions is provided by adding an aqueous solution containing one or more selected from the group consisting of FeCl 3 , FeCl 3 ·6H 2 O, Fe(NO 3 ) 3 , and Fe(NO 3 ) 3 ·9H 2 O to an ion exchange resin.

3 . The method according to claim 2 , wherein the ion exchange resin is a cation exchange resin.

4 . The method according to claim 1 , wherein the hexavalent chromium (Cr 6+ ) compound is CaCrO 4 , Na 2 CrO 4 , or K 2 Cr 2 O 7 .

5 . The method according to claim 1 , wherein the ion-exchanged aqueous solution comprises Fe 3+ ions and Cr 6+ ions.

6 . The method according to claim 1 , wherein the heat-treating is performed under a vacuum atmosphere, an oxygen (O 2 ) atmosphere, a nitrogen (N 2 ) atmosphere, or an argon (Ar) atmosphere.

Assignees

• Univ Korea Res & Bus Found

Inventors

• Song Sang Hoon

Classifications

• H01M10/0525

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

• B01J47/02 Primary

  Column or bed processes · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C01P2002/34

  perovskite-type (ABO3) · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title