Cyclic voltammetric study of tin hexacyanoferrate for aqueous battery applications

Abstract

<p><span lang="EN-US">A hybrid composite containing 65 mass % of tin hexacyanoferrate mixed with 35 mass % of carbon nanotubes has been synthesized and its electrochemical behavior as a negative electrode in alkali metal-ion batteries has been studied in 1 mol L^-1 aqueous solution of sodium sulfate. The specific capacity of pure tin hexacyanoferrate is 58 mAh g^-1, whereas the specific capacity normalized per total electrode mass of the composite studied reaches 34 mAh g^-1. The estimated maximal specific power of an aqueous alkali-metal ion battery with a tin hexacyanoferrate electrode is ca. 3.6 kW kg^-1 being comparable to characteristics of industrial electric double-layer capacitors. The maximal specific energy accumulated by this battery may reach 25.6 Wh kg^-1 at least three times exceeding the specific energy for supercapacitors.</span></p>