Proton‐Assisted Aqueous Manganese‐Ion Battery Chemistry

Abstract

Aqueous manganese-ion batteries (MIBs) are promising energy storage systems because of the distinctive merits of Mn metal, in terms of high abundance, low cost, nontoxicity, high theoretical capacity and low redox potential. Conventional MIBs are based on the Mn 2 + ion storage mechanism, whereas the capacity in cathode materials is generally limited due to the high charge density and large solvated ionic radius of Mn 2 + ions in aqueous electrolytes. Herein, proton intercalation chemistry is introduced in aqueous MIBs, in which the layered Al 0.1 V 2 O 5 •1.5 H 2 O (AlVO) cathode exhibits a consequent Mn 2 + and H + ion intercalation/extraction process. Such an energy storage mechanism contributes to enhanced electrochemical performance, including high capacity, fast reaction kinetics and stable cycling behavior. Benefiting from this proton intercalation chemistry, the aqueous Mn j j AlVO cells could deliver high specific energy and power simultaneously. This work provides a route for the design of high-performance aqueous MIBs.

Two-dimensional materials for aqueous zinc-ion batteries

“…2D layered vanadium-based oxides are also the popular cathode materials of aqueous ZIBs due to the multi-electron redox capability of vanadium and their large lattice spacing, which ensure a high capacity and fast charge/discharge behaviors [74][75][76][77][78][79]. Among various layered vanadium-based oxides, V 2 O 5 possesses a higher theoretical capacity of 589 mAh g −1 based on V 5+ /V 3+ redox couple, while its low electronic conductivity and poor structural stability result in unsatisfied rate capability and cycling behavior [80].…”

What About Manganese? Toward Rocking Chair Aqueous Mn-Ion Batteries

“…Encouraged by the excellent performance of the anode side, our further efforts were directed toward finding a suitable cathode to enable the reversible insertion of Mn ions. Although the use of V 2 O 5 as an insertion cathode for Mn-ion was recently proposed, 30,31 its potential operation range is wide, spreading over 2 V as can be seen from GCD profiles (see Figure S11) making this cathode not practical. In the search for a more suitable cathode material, the use of NiHCF was evaluated.…”