Reversible aqueous zinc/manganese oxide energy storage from conversion reactions

Water‐Lubricated Intercalation in V2O5·nH2O for High‐Capacity and High‐Rate Aqueous Rechargeable Zinc Batteries

“…[29,30] VOG exhibits the highest energy density of the three while limiting the discharge time within 1 h, and delivers high energy densities over the power densities from 10 2 to 10 4 W kg −1 . As shown in Figure 3d, VOG can achieve an energy density of ≈290 Wh kg −1 at 60 mA g −1 and maintains at ≈171 Wh kg −1 with a power density of 12.2 kW kg −1 .…”

“…In conclusion, our aqueous Zn battery system based on [29,30] In this figure, the energy density values were calculated by integrating the voltage profile during discharge.…”

“…An initial attempt on the hexacyanoferrate system delivered a limited capacity (≈60 mA h g −1 ), although a high operation voltage of ≈1.7 V was achieved. [23][24][25][26][27][28] Recently, Pan et al demonstrated that the manganese oxide cathode goes through a chemical conversion reaction with the zinc species and H 2 O rather than the simple intercalation process, delivering a high capacity of ≈285 mA h g −1 and an operating voltage of ≈1.44 V. [29] Nazar's group developed a Zn 0.25 V 2 O 5 ·nH 2 O cathode material, which displayed a specific energy of ≈250 Wh kg −1 (based on cathode) and a high capacity of 220 mA h g −1 at 15 C (1 C = 300 mA g −1 ). [30] During cycling, the structural water in Zn 0.25 V 2 O 5 ·nH 2 O was revealed to exchange with Zn 2+ reversibly, thus resulting in good kinetics and rate performance.…”

Carbon-coated manganese dioxide nanoparticles and their enhanced electrochemical properties for zinc-ion battery applications

“…16 Naturally abundant, low-cost, and environmentally benign 17 highly conducting materials, such as carbon can be used to over- 18 come the aforementioned limitation of MnO 2 . Carbon-coated elec- 19 trode materials such as transition metal oxides have been widely 20 studied to obtain high performance electrodes [6][7][8][9] . Hashem et al 21 prepared carbon-coated rod-shaped MnO 2 in order to achieve an 22 electrode material with enhanced electrochemical performance for 23 lithium-ion battery (LIB) application [10] .…”

“…The first discharge capacity for the α-MnO 2 @C was 272 mAh/g, 189 [19,20] . The carbon coating can effectively prevent manganese dis-214 solution from the MnO 2 electrode during the electrochemical reac-215 tion, thereby improving the electrode stability [4,10] .…”