This technology is an electrode active material that incorporates transition metals (Mn or Cr) and hydration water (H2O) into a vanadium oxide (V2O5) framework, enabling the reversible intercalation and deintercalation of divalent calcium ions (Ca2+), which was difficult to achieve with conventional lithium-ion battery materials.
While existing cathode materials for lithium-ion batteries, such as V2O5, are effective for lithium ions, they face significant challenges when used in calcium-ion batteries, as the intercalation and deintercalation of calcium ions are hindered, leading to either a complete failure in charging/discharging or severely degraded performance.
This technology is configured to secure a reversible migration path for calcium ions by synthesizing an electrode composition with a new crystal structure in the form of AxV2O5·y(H2O) through the reaction of vanadium oxide with Mn or Cr-based transition metal salts in an acidic aqueous solution, such as nitric acid. It can be applied to calcium-ion battery cathodes, low-cost energy storage systems based on abundant elements, and research into active materials for multivalent ion batteries. Furthermore, since synthesis is possible through room-temperature aqueous reactions, it is easily scalable for mass production.
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