Enhanced and stabilized charge transport boosting by Fe-doping effect of V2O5 nanorod for rechargeable Zn-ion battery

Stable anode enabled by an embossed and punched structure for a high‐rate performance Zn‐ion hybrid capacitor

“…The electrochemical kinetics of the various electrodes is proved by the EIS and CV results (Figure 5). Here, the EIS Nyquist plots (Figure 5A) of all three electrodes exhibit a semicircle in the high‐frequency region and a straight sloping line in the low‐frequency region, which express the charge‐transfer resistance and Warburg impedance, respectively 21‐23 . The charge‐transfer resistances of the EZN and EPZN electrodes are seen to be similar to that of the bare Zn, thus indicating that the surface engineering does not alter the electrical properties.…”

Improvement of structural stability of cathode by manganese additive in electrolyte for zinc‐ion batteries

“…Vanadium oxide (V 2 O 5 ) and manganese dioxide (MnO 2 ) are promising cathode materials for ZIBs. However, in V 2 O 5 with a layered structure, the distortion of the V‐O coordination polyhedra during the Zn‐ion insertion/desertion process leads to poor cycling stability, and this drawback has limited the use of the V 2 O 5 cathode 10,11 . By contrast, among the various phases of MnO 2 (ie, α, β, γ, and δ), β‐MnO 2 is expected to offer a favorable intercalation space for Zn ions owing to its large and stable 1 × 1 tunnel structure, which provides high specific capacity and high electrochemical stability 8,9,13 .…”

“…[5][6][7][8] Among batteries involving such technologies, aqueous zinc-ion batteries (ZIBs) are characterized by Zn 2+ -based electrochemistry and a two-electron transfer mechanism, which leads to the high energy density and outstanding safety of these batteries. [9][10][11] Furthermore, the use of an aqueous electrolyte in ZIBs helps keep the battery cost low, improve the ease of assembly of the battery, and achieve outstanding ionic properties, which can provide efficient charge transfer during cycling. 12 These benefits are significant in the transportation market.…”

Improved‐quality graphene film decorated with ultrafine MnO 2 nanoparticles as a multifunctional current collector for high‐reversibility zinc‐ion batteries

“…[9][10][11] Moreover, the use of Zn as the anode material affords a relatively low electrochemical potential of À0.76 V (vs SCE) along with a remarkable theoretical specific capacity of 820 mA h g À1 . [12][13][14][15] In fact, the twoelectron transfer mechanism provides the ZIBs with a higher energy density than the LIBs, while the high overpotential for hydrogen evolution provides outstanding electrochemical stability. [16][17][18][19][20][21] Nonetheless, the electrochemical performance is primarily determined by the ability of the cathode to accommodate the Zn ion.…”

“…[12][13][14] Hence, it is crucial to identify the interrelation between the selected current collector and cathodic materials. 15 In this regard, manganese oxide (MnO 2 ) can provide a reasonable cathode material for the ZIB due to its earth-abundance, multiple valence states, and environmental benignity, along with high specific capacity and operation potential. Among the various phases of MnO 2 (including α-, β-, γ-, and δ-), α-MnO 2 is expected to offer a relatively large intercalation space for the Zn ions due to the large and stable 2 Â 2 tunnel structure, thus leading to a high specific capacity and electrochemical stability.…”