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

Hydrated Vanadium Oxide-Based Calcium Battery Cathode Electrochemically Synthesized on Carbon Electrodes

This technology utilizes hydrated vanadium oxide with a monoclinic crystal structure as an electrode active material to enable the reversible intercalation and deintercalation of calcium ions.

When conventional active materials for lithium-ion batteries are applied to calcium-ion batteries, calcium ions often become irreversibly trapped, preventing them from being extracted. This results in limitations such as the inability to charge and discharge or significantly degraded performance.

This technology uses CaxV2O5·yH2O (where 0 ≤ x < 2 and 0 < y < 1) as the active material. It is configured by directly forming V2O5·yH2O on a carbon electrode via electrochemical oxidation in a vanadium electrolyte solution, followed by conversion in a calcium electrolyte. This process allows for the growth of the active material directly onto the current collector without a binder. It is applicable to the development of large-scale calcium-based storage batteries and offers the advantage of eliminating slurry coating steps while enhancing adhesion between the active material and the carbon electrode.

‍

‍

Key Features:

• Cathode for calcium-ion batteries comprising a carbon electrode and CaxV2O5·yH2O formed thereon via an electrochemical method
• Step of manufacturing V2O5·yH2O by applying voltage after placing a carbon electrode and a metal electrode in a first electrolyte solution containing a vanadium compound
• Step of converting V2O5·yH2O into CaxV2O5·yH2O through an electrochemical reaction using a second electrolyte solution containing calcium ions
• Calcium-ion battery in which a separator and an electrolyte are disposed between a monoclinic CaxV2O5·yH2O cathode and an anode

‍