Aqueous TiO2/Ni(OH)2 rechargeable battery with a high voltage based on proton and lithium insertion/extraction reactions

A new aqueous TiO2/Ni(OH)2 rechargeable battery system with a high voltage, consisting of α-phase nickel hydroxides as the cathode and TiO2 nanotube arrays as the anode, is proposed for the first time. It is a feasible strategy to combine two different reaction mechanisms in an aqueous alkaline electrolyte: proton and lithium insertion/extraction reactions.