Electrode composition for calcium-ion batteries, method for manufacturing the electrode composition for calcium-ion batteries, calcium-ion battery, and method for manufacturing the calcium-ion battery

Room-Temperature Calcium-Ion Batteries Based on Low-Polarization Prussian Blue Analogue Active Materials

This technology utilizes a Prussian Blue Analogue (PBA) with the chemical formula KxNi[Fe(CN)6]1-y·z(H2O) as an active material for calcium-ion batteries, enabling reversible intercalation and deintercalation of calcium ions.

Existing electrode materials for calcium-ion batteries often suffer from high polarization, leading to low energy efficiency or requiring high-temperature operation. Furthermore, there have been technical limitations in achieving reversible ion insertion and extraction reactions in non-aqueous electrolytes.

This technology uses an active material synthesized through a precipitation reaction between a nickel ion solution and K4[Fe(CN)6], with the crystal structure optimized by adjusting the potassium content (x=0.4 to 1) via electrochemical methods. As a result, calcium ions behave reversibly with low polarization of less than 1V even in room-temperature non-aqueous electrolytes. This allows for application in room-temperature calcium batteries and large-scale renewable energy storage systems, reducing the operational burden associated with high-temperature maintenance equipment.

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Key Features:

• An electrode comprising a KxNi[Fe(CN)6]1-y˙z(H2O) active material where x is between 0 and 1, and y is between 0 and 1.
• A calcium-ion battery equipped with an electrode containing a KxNi[Fe(CN)6]1-y˙z(H2O) active material, allowing for the reversible insertion and extraction of calcium ions.
• A step of forming an active material by mixing KxNi[Fe(CN)6]1-y˙z(H2O) powder with a conductive agent and a binder.
• A step of forming an electrode for a calcium-ion battery by applying the active material obtained from the mixture onto a current collector.

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