Potassium-ion battery
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Potassium-ion battery
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The potassium-ion battery was first invented by the American/Iranian chemist, Ali Eftekhari, in 2004[1] as an alternative to lithium-ion batteries. The battery uses Prussian blue[2] as the cathode material for its stability, the prototype could be successfully used for millions of cycles. The prototype was made of KBF4 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 of K+ in electrolyte solution (solvated ions).
Since the electrochemical potential of K+ is identical to that of Li+, 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 KPF6 was patented.[3][4] China's Starsway Electronics marketed the first potassium battery-powered PMP as a high energy device.[5]
See also
References
- ^ Eftekhari, A (2004). "Potassium secondary cell based on Prussian blue cathode". Journal of Power Sources 126: 221. doi:10.1016/j.jpowsour.2003.08.007.
- ^ Itaya, K; Ataka, T; Toshima, S (1982). "Spectroelectrochemistry and electrochemical preparation method of Prussian Blue modified electrodes". Journal of the American Chemical Society 104 (18): 4767. doi:10.1021/ja00382a006.
- ^ US 20090263717 Ramasubramanian, M; Spotnitz, RM
- ^ US 2005017219 Li, W; Kohoma, K; Armand, M; Perron, G
- ^ Melanson, D (24 October 2007). "China's Starsway touts potassium battery-powered PMP". Engadget. http://www.engadget.com/2007/10/24/chinas-starsway-touts-potassium-battery-powered-pmp/. Retrieved 2011-09-16.
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