Anode for potassium-ion batteries, method for manufacturing the same, and potassium-ion battery comprising the same

Anode for Potassium-Ion Batteries Comprising Cobalt-Doped Cu3PS4 Nanocrystals and CNT Composites

This technology involves synthesizing copper phosphorus sulfide (Cu3PS4) nanocrystals as an anode active material for potassium-ion batteries, then doping them with cobalt (Co) and physically compositing them with carbon-based conductive agents like CNTs to enhance electrochemical performance.

Conventional anode materials for potassium-ion batteries have suffered from poor cycling stability and insufficient rate capability due to the repeated insertion and extraction of large potassium ions.

This technology synthesizes Cu3PS4 nanoparticles by ball-milling Cu, P, and S powders, then re-ball-milling them with cobalt powder and carbon-based conductive agents like CNTs to form a cobalt-doped composite anode structure, thereby improving the reversible insertion/extraction efficiency of potassium ions and electrode stability. It can be applied to large-capacity energy storage systems (ESS) and low-cost grid auxiliary power sources that reduce reliance on lithium resources, with the advantage of enabling mass production of anode materials through solvent-free mechanical synthesis.

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Key Features:

• Step of physically mixing Cu, P, and S powders to form Cu3PS4
• Step of physically mixing the formed Cu3PS4 with cobalt powder and carbon-based conductive agents via ball-milling
• Anode for potassium-ion batteries comprising cobalt-doped Cu3PS4 and carbon nanotubes
• Electrolyte positioned between the anode and cathode, consisting of a potassium salt dissolved in an alkyl ether-based solvent

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This invention was developed with support from the Ministry of Science and ICT for the development of high-capacity, long-life metal thiophosphate anode materials for sodium and potassium-ion batteries through the stabilization of layered and tunnel structures.

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