A team from the Max Planck Institute for Solid State Research in Stuttgart and the University of Science and Technology of China, Hefei, has developed a high-power, high-capacity sodium battery with 96% capacity retention after 2,000 cycles. A paper on their work is published in the journal Advanced Materials.
The researchers combined sodium vanadium triphosphate (Na3V2(PO4)3) with a mixture of reduced graphene oxide and carbon nanotubes to improve the sodium compound’s conductivity.
Using a facile electrostatic spray deposition (ESD) technique, they deposited the material onto a current-collecting stainless steel support.
Such an electrode displays excellent rate capability and long cycling stability, which is rather typical of supercapacitors but is connected here with the much higher energy density of an efficient battery electrode.—Zhu et al.
Zhu, C., Kopold, P., van Aken, P. A., Maier, J. and Yu, Y. (2016), “High Power–High Energy Sodium Battery Based on Threefold Interpenetrating Network.” Adv. Mater. doi: 10.1002/adma.201505943