A Novel Titanium/Manganese Redox Flow Battery

Abstract

In this paper we report a novel redox flow battery using a titanium and manganese mixed solution as both positive and negative electrolytes. Ti(IV) ions existing in positive electrolyte suppress the Mn(III) disproportionation reaction, as well as particle growth of Mn dioxides. The energy density of 23.5 kWh m-3 was obtained in a single cell test, which is comparable to that of all-vanadium RF battery. Mn dioxide nanoparticles contribute to excellent flowablity and electro-active performance. In the cycling stability test, the performance is stable over more than 40 cycles. It is considered that the same electrolyte in both half-cells prevent mixing of electro-active species.