Alkaline Earth Metal-V-O-H Based Electrode Composition for Calcium-Ion Batteries and Calcium-Ion Battery Comprising the Same

Vanadium Hydrate Electrode Enabling Reversible Calcium Ion Intercalation via Magnesium/Calcium Intercalation

This technology utilizes layered vanadium oxide hydrate (AxV2O5·y(H2O)) with intercalated alkaline earth metals, such as magnesium or calcium, as an electrode active material to enable the reversible intercalation and deintercalation of calcium ions (Ca²⁺).

When V2O5, a cathode material for lithium-ion batteries, is used directly in divalent calcium-ion batteries, the intercalation and deintercalation of calcium ions are hindered, leading to issues where charging and discharging are either impossible or severely limited in performance.

This technology involves reacting V2O5 with alkaline earth metal salts in an acidic aqueous solution to synthesize a new crystalline AxV2O5·y(H2O) (x: 0.1–2, y: 0–9) hydrate active material, where alkaline earth metals are positioned between layers to secure a reversible pathway for calcium ion movement. It can be applied to calcium-based high-capacity energy storage systems that eliminate reliance on lithium resources, as well as low-cost batteries using aqueous electrolytes, thereby expanding the commercialization potential of next-generation multivalent ion batteries that utilize abundant calcium reserves.

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Key Features:

• AxV2O5·y(H2O) electrode composition in hydrate form containing alkaline earth metal A, where x is greater than 0.1 and less than 2, and y is greater than 0 and less than 9
• Step of preparing a composition containing AxV2O5·y(H2O) by introducing V2O5 into an acidic aqueous solution followed by an alkaline earth metal salt
• Calcium-ion battery employing an aqueous or non-aqueous electrolyte with a separator placed between the cathode and anode
• Step of forming an electrode for a calcium-ion battery by coating a current collector with the AxV2O5·y(H2O) hydrate active material

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