Ag-V-O-based electrode composition for calcium-ion batteries and calcium-ion batteries containing the same

Cathode implementing calcium intercalation using silver-doped monoclinic vanadium oxide

This technology enables the electrochemical operation of calcium-ion batteries by utilizing AgxV2O5 (0 < x < 0.5) with a monoclinic crystal structure as a cathode active material, allowing for the reversible insertion and extraction of calcium ions.

Existing cathode active materials used for lithium-ion batteries struggle to reversibly accept and release divalent calcium ions. Consequently, when applied to calcium-ion batteries, they often face issues such as poor charge/discharge performance or complete failure to operate.

This technology secures a reversible intercalation pathway for calcium ions by using monoclinic crystalline AgxV2O5, obtained through mixing a silver precursor with vanadium oxide followed by hydrogen peroxide reaction and heat treatment, as the cathode active material. It can be applied to low-cost, calcium-based secondary batteries that replace lithium, as well as grid-connected storage facilities where resource supply stability is critical. A key advantage is the ability to produce calcium-driven cathodes through relatively simple wet synthesis and heat treatment.

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Key Features:

• Cathode active material for calcium-ion batteries containing monoclinic crystalline AgxV2O5, where x satisfies the range of 0 < x < 0.5
• A step of mixing a silver precursor and vanadium oxide in a solvent, followed by adding hydrogen peroxide to induce a reaction
• A step of heat-treating the reactant obtained from the hydrogen peroxide reaction to produce AgxV2O5 where 0 < x < 0.5
• Cathode for calcium-ion batteries formed by applying a mixture of crystalline AgxV2O5, a binder, and a conductive agent onto a current collector

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