Charged-optimized ZnO/ ZnV2O4 composite hollow microspheres robust zinc-ion storage capacity

N-Doping-Induced Amorphization for Achieving Ultrastable Aqueous Zinc-Ion Batteries

“…In the following cycles, the irreversible phase transition completes, and two sets of main distinct redox peaks emerge at approximately 1.10/0.94 and 0.72/0.60 V in the N−V 2 O 3 @N−C electrode, suggesting a multistep reaction mechanism in the ion (de)insertion process. 37,38 Besides, the similar peak currents for the following CV curves illustrate the high reversibility of N−V 2 O 3 @N−C. The corresponding GCD curves of N−V 2 O 3 @N−C, shown in Figure 2b, align with the CV analysis.…”

“…Similar to the N–V 2 O 3 @N–C electrode, the V 2 O 3 @C electrode also undergoes an irreversible phase transition in the first lap, indicating that both V 2 O 3 @C and N–V 2 O 3 @N–C electrodes undergo an irreversible phase transition. In the following cycles, the irreversible phase transition completes, and two sets of main distinct redox peaks emerge at approximately 1.10/0.94 and 0.72/0.60 V in the N–V 2 O 3 @N–C electrode, suggesting a multistep reaction mechanism in the ion (de)­insertion process. , Besides, the similar peak currents for the following CV curves illustrate the high reversibility of N–V 2 O 3 @N–C. The corresponding GCD curves of N–V 2 O 3 @N–C, shown in Figure b, align with the CV analysis.…”

Activating ZnV2O4by an Electrochemical Oxidation Strategy for Enhanced Energy Storage in Zinc-Ion Batteries

“…The activated ZnV 2 O 4 /C–N cathode renders a V 5+ /V 3+ redox transition, giving 301 mAh g –1 at 0.3 A g –1 . An initial charging process induces the ZnO/ZnV 2 O 4 composite to turn into a more stable structure, which allows better Zn storage capability for the following charge/discharge cycles . In addition to ZnV 2 O 4 , MgV 2 O 4 has an oxidative peak at 1.29 V in the first cycle, and the parent crystal structure is transformed into a disordered phase for the subsequent cycles .…”

“…An initial charging process induces the ZnO/ZnV 2 O 4 composite to turn into a more stable structure, which allows better Zn storage capability for the following charge/discharge cycles. 33 In addition to ZnV 2 O 4 , MgV 2 O 4 has an oxidative peak at 1.29 V in the first cycle, and the parent crystal structure is transformed into a disordered phase for the subsequent cycles. 34 A specific capacity of 272 mAh g −1 is obtained at 0.2 A g −1 , and a reversible capacity of 128.9 mAh g −1 can be retained after 500 cycles at 4 A g −1 .…”

Cesium-doped ammonium vanadium bronze nanosheets as high capacity aqueous zinc-ion battery cathodes with long cycle life and superb rate capability

“…There are two sharp cathodic peaks at 0.3 V and 0.45 V, a broader cathodic peak at 0.9 V, and multiple wave peaks in the anodic curve. A total of three pairs of redox peaks (1.35, 1.05, 0.7 V and 1.3, 0.9, 0.5 V) appeared in the second cycle curves, corresponding to the multi-step intercalation/de-intercalation process of Zn 2+ /H + , 31 and the wave positions did not change, indicating that the electrochemical reaction is stabilized after the first cycle. As the cycle progresses, CNVO shows a decrease in the anodic peak at 1.3 V, which is due to the decrease in current caused by the deamination of CNVO at a higher voltage.…”