Potassium-ion battery
Encyclopedia
The potassium-ion battery was first invented by the American/Iranian chemist, Ali Eftekhari, in 2004 as an alternative to lithium-ion batteries. The battery uses Prussian blue
Prussian blue
Prussian blue is a dark blue pigment with the idealized formula Fe718. Another name for the color Prussian blue is Berlin blue or, in painting, Parisian blue. Turnbull's blue is the same substance but is made from different reagents....

 as the cathode material for its stability, the prototype could be successfully used for millions of cycles. The prototype was made of electrolyte though almost all common electrolyte salts of lithium batteries (their potassium salts) can be used for the construction of potassium battery. The potassium battery designed had some valuable advantages in comparison with similar lithium batteries: the cell design is simple, and both the material used and the procedure needed for the cell fabrication are cheaper. The chemical diffusion coefficient of K+ in the cell is higher than that of Li+ in lithium batteries, which is due to a smaller Stokes radius
Stokes radius
The Stokes radius, Stokes-Einstein radius, or hydrodynamic radius RH, named after George Gabriel Stokes, is not the effective radius of a hydrated molecule in solution as often mentioned. Rather it is the radius of a hard sphere that diffuses at the same rate as the molecule. The behavior of this...

 of K+ in electrolyte solution (solvated ions).

Since the electrochemical potential of is identical to that of , the cell potential is similar to that of lithium-ion. Potassium batteries can accept a wide range of cathode materials with excellent rechargeability, cheaper materials, etc. A noticeable advantage of potassium battery is the availability of potassium graphite, which is used as an anode material in current lithium-ion battery. Its stable structure guarantees a reversible intercalation/de-intercalation of potassium ions during the charging/discharging process.

A potassium battery that uses molten electrolyte of was patented. China's Starsway Electronics marketed the first potassium battery-powered PMP
Portable media player
A portable media player or digital audio player, is a consumer electronics device that is capable of storing and playing digital media such as audio, images, video, documents, etc. the data is typically stored on a hard drive, microdrive, or flash memory. In contrast, analog portable audio...

 as a high energy device.

See also

  • Lithium-ion battery
  • Lithium–air battery
  • Thin-film battery
  • Rechargeable electricity storage system
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