Al-V-O-H-based electrode composition for calcium-ion batteries and calcium-ion battery containing the same

Electrode active material implementing calcium-ion intercalation using aluminum-doped hydrated vanadium oxide

This technology utilizes an AlxV2O5·y(H2O) (0.1 < x < 2, 0 < y < 9) compound, obtained by reacting V2O5 with an aluminum salt in an acidic aqueous solution, as a cathode or anode active material for calcium-ion batteries, enabling the reversible insertion and extraction of calcium ions.

While V2O5 is an effective active material for lithium-ion batteries, it has faced technical limitations when applied to divalent calcium ions, as it does not allow for reversible insertion and extraction, making it difficult to operate the battery.

This technology involves dissolving V2O5 in an acidic aqueous solution, such as nitric acid, and then adding an aluminum salt, such as Al(NO3)3 or Al(ClO4)3, to form an aluminum-doped, hydrated vanadium oxide structure. The resulting active material supports the reversible intercalation of calcium ions. It can be applied to stationary energy storage systems linked to renewable energy and to the development of multivalent ion cells by battery manufacturers looking to mitigate lithium supply chain risks. A key advantage is the ability to easily secure electrode materials for calcium-ion batteries through simple synthesis in an aqueous solution at room temperature.

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Key Features:

• Electrode composition for calcium-ion batteries comprising AlxV2O5·y(H2O) where 0.1 < x < 2 and 0 < y < 9
• Step of preparing a composition containing AlxV2O5·y(H2O) by introducing an aluminum salt into an acidic aqueous solution containing V2O5
• Aluminum salt selected from one or more of Al(NO3)3, Al(ClO4)3, Al(OOCCH3)3, and AlCl3, added to a nitric acid aqueous solution
• Calcium-ion battery comprising an AlxV2O5·y(H2O) active material in the cathode or anode, with a separator interposed between the cathode and anode

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