Vanadium solid-salt battery: Solid state with two redox couples

Tomoo Yamamura, Xiongwei Wu, Suguru Ohta, Kenji Shirasaki, Hiroki Sakuraba, Isamu Satoh, Tatsuo Shikama

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We present the "vanadium solid-salt battery" (VSSB), which has high energy density, is low cost, is easily recycled, operates at ambient temperature, and has no requirement for special solvents. The VSSB contains two types of vanadium solid salts that are supported on carbon felts with a minimal amount of hydrosulfuric acid added to moisten the ion-exchange membrane. The optimized VSSB shows a cell potential of 1.34 V, excellent reproducibility for charging and discharging for nearly 100 cycles, a high energy efficiency (87%) and a high energy density (77 W h kg-1 at 5 mA cm-2 using the carbon felt XF208). The energy density is enhanced by 250-350% compared with conventional vanadium redox-flow batteries.

Original languageEnglish
Pages (from-to)4003-4011
Number of pages9
JournalJournal of Power Sources
Issue number8
Publication statusPublished - 2011 Apr 15


  • High energy density
  • Hybrid vehicles
  • Smart grid
  • Solid salt battery
  • Vanadium


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