Method for Manufacturing Iron-Chromium Oxide Using Ion-Exchange Resin

Method for Synthesizing Electrochemically Active Iron-Chromium Oxide Using Ion-Exchange Resin

This technology involves synthesizing iron-chromium oxide by loading Fe3+ ions onto an ion-exchange resin and performing ion exchange with a hexavalent chromium compound. It increases electrical capacity by substituting electrochemically active Fe3+ ions for the inactive Cr3+ ions found in conventional chromium oxides.

Conventional chromium oxide cathode materials (Cr8O21, Cr2O5) contain Cr3+ ions that do not contribute to oxidation/reduction reactions, which limits their potential for increasing electrical capacity.

By utilizing Fe3+-substituted ion-exchange resin to react with hexavalent chromium compounds and then heat-treating the product at 270–350°C, this technology can be applied to improve the stability and cycle life of secondary batteries.

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Key Features:

• Providing an ion-exchange column substituted with Fe3+ ions for the synthesis of iron-chromium oxide
• Introducing a hexavalent chromium compound into the ion-exchange resin column to obtain an ion-exchanged aqueous solution
• Heat-treating the aqueous solution obtained through ion exchange to produce iron-chromium oxide
• A configuration for manufacturing electrochemically active iron-chromium oxide through the exchange of iron ions loaded on an ion-exchange resin with a chromium compound

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