“…Normally, the formation of dendrite, dead Zn, and insulation byproducts would significantly damage the anode-electrolyte interface and block the ion/electron transport, leading to a sluggish kinetics of Zn deposition. [53] However, those issues can be effectively addressed by in situ building the robust and zincophilic interphase via the electrolyte additive modification. First, such dense interphase can isolate the Zn anode and electrolyte to prevent the waterinduced side reactions, inhibiting the dendrite formation and byproducts.…”
Dendrite growth and parasitic side reactions are thorny issues that seriously damage the anode-electrolyte interface during Zn plating/stripping process, leading to uncontrollable Zn deposition and restraining application of aqueous Zn-ion batteries (AZIBs). Here, a unique facile strategy to in situ build indium (In) metal interphase on the Zn anode is first proposed. The combination of experimental and theoretical investigations demonstrate that such metallic interphase prevents the hydrogen evolution reaction (HER) and Zn corrosion, and guides preferential growth along the Zn(002) plane to achieve smooth Zn deposition. As a result, the modified Zn anodes achieve the ultrahigh cumulative capacities of 5600 and 5000 mAh cm −2 at the high current densities of 2 and 5 mA cm −2 , respectively, demonstrating an ultrastable plating/stripping behavior. More encouragingly, the rate performance and cyclic stability of the Zn-V 2 O 5 battery with the electrolyte additive can still deliver a specific capacity of 383.6 mAh g −1 after 5000 cycles at the high current density of 5 A g −1 . The strategy presented here as well as the in-depth understanding of modified mechanism can not only provide an effective solution to address the Zn anode concerns, but also deepen the understanding of AZIBs.
“…Normally, the formation of dendrite, dead Zn, and insulation byproducts would significantly damage the anode-electrolyte interface and block the ion/electron transport, leading to a sluggish kinetics of Zn deposition. [53] However, those issues can be effectively addressed by in situ building the robust and zincophilic interphase via the electrolyte additive modification. First, such dense interphase can isolate the Zn anode and electrolyte to prevent the waterinduced side reactions, inhibiting the dendrite formation and byproducts.…”
Dendrite growth and parasitic side reactions are thorny issues that seriously damage the anode-electrolyte interface during Zn plating/stripping process, leading to uncontrollable Zn deposition and restraining application of aqueous Zn-ion batteries (AZIBs). Here, a unique facile strategy to in situ build indium (In) metal interphase on the Zn anode is first proposed. The combination of experimental and theoretical investigations demonstrate that such metallic interphase prevents the hydrogen evolution reaction (HER) and Zn corrosion, and guides preferential growth along the Zn(002) plane to achieve smooth Zn deposition. As a result, the modified Zn anodes achieve the ultrahigh cumulative capacities of 5600 and 5000 mAh cm −2 at the high current densities of 2 and 5 mA cm −2 , respectively, demonstrating an ultrastable plating/stripping behavior. More encouragingly, the rate performance and cyclic stability of the Zn-V 2 O 5 battery with the electrolyte additive can still deliver a specific capacity of 383.6 mAh g −1 after 5000 cycles at the high current density of 5 A g −1 . The strategy presented here as well as the in-depth understanding of modified mechanism can not only provide an effective solution to address the Zn anode concerns, but also deepen the understanding of AZIBs.
“…Thus, all evident results suggest that the ZIBs using Zn-PPy/rGO005 as anode possess the highest energy density, which is in good agreement with the CVs results. Figure 7 ( a ) Galvanostatic charge–discharge profile at 0.1 A/g, ( b ) Capacity retention of the ZIBs, ( c ) Rate capability at different discharge rates, and ( d ) Ragone plots showing the comparison of the energy densities and power densities of our batteries with the Zn//MnO 2 batteries reported in the literature using MoS 2 coated Zn 31 , Polypyrrole coated Zn 22 , Functionalized CNF coated Zn 23 , PA coated Zn 25 and CB coated Zn 28 as anodes. …”
Section: Resultsmentioning
confidence: 99%
“…Various strategies have been explored to dispatch these issues, such as surface modification of zinc foils 27 , incorporation of zinc powder with conductive materials 14 , coating surface of Zn with protection layer 22 , 23 and so on 25 , 28 – 30 . Among these strategies, the zinc electrodeposition on the host conductive current collectors (Ni foams, ZnO, Zn/Al alloys, etc.)…”
Metallic zinc (Zn) anode has been received a great promise for aqueous rechargeable zinc-ion batteries (ZIBs) due to its intrinsic safety, low cost, and high volumetric capacity. However, the dendrite formation regarding the surface corrosion is the critical problems to achieve the high performance and the long lifespans of ZIBs. Here, we purpose the facile cyclic voltammetry deposition of polypyrrole/reduced graphene oxide (PPy/rGO) composites coated onto Zn 3D surface as Zn anode for ZIBs. As results, the deposited PPy/rGO layer demonstrates the homogeneous distribution covering onto Zn surface, effectively suppressing the formation of dendrite. Additionally, a symmetric cell of the PPy/rGO coated Zn remarkably enhances an electrochemical cycling with a low voltage hysteresis for zinc plating/stripping, which is superior to the pristine Zn cell. In addition, the deposited layer of PPy/rGO on Zn effectively improves the reactivity of electrochemically active surface area and the intrinsic electronic configurations, participating in extraction/intercalation of Zn2+ ions and leading to enhance ZIBs performance. The coin cell battery of Zn-PPy/rGO//MnO2 can deliver a high initial discharge capacity of 325 mAh/g at 0.5A/g with a good cycling stability up to 50% capacity retention after 300 cycles. Thus, these achieved results of Zn-PPy/rGO//MnO2 battery with dendrite-free feature effectively enhance the life-performance of ZIBs and open the way of the designed coating composite materials to suppress dendrite issues.
“…[35,36] Besides the modification of electrolyte compositions, the surface engineering of Zn has also been extensively studied, in which artificial layers were introduced on the Zn surface to enhance the electronic conductivity and/or the attraction with Zn 2+ . The conductive materials investigated for surface-coating have included reduced graphene oxide, [37] N-doped graphene oxide, [38] graphite, [39] N-doped carbon, [40] carbon nanofiber, [41] carbon nanotube (CNT) foam, [42] free-standing CNT/paper scaffold, [43] MXene, [44] Zn-Cu alloy, [45,46] polypyrrole, [47] Tin, [48] ZnF 2 /Ag, [49] ZnF 2 , [50,51] and Ag, [52] all of which were reported to be effective in suppressing dendrites because the "tip effect" could be alleviated by a uniform distribution of the electric field. Nonconductive materials were also applied to enhance the attractive force toward Zn 2+ ions.…”
Repeated charge/discharge in aqueous zinc‐ion batteries (ZIBs) commonly results in surface corrosion/passivation and dendrite formation on zinc anodes, which is a major challenge for the commercialization of zinc‐based batteries. In this work, metallic Zn modified by self‐assembled monolayers is described as a viable anode for ZIBs. ω‐mercaptoundecanoic acid that is spontaneously adsorbed on Zn (MUDA/Zn) contributes to the simultaneous suppression of side reactions and dendrite formation in ZIBs. Though one‐molecular‐thick, densely packed alkyl chains prohibit H2O and H+ from making direct contact with the underlying Zn, and surface carboxylate moieties (–COO‐) effectively repel anionic species (OH‐) in a solution, which renders a Zn anode inert against zincate formation within a wide range of pH. In contrast, the electrostatic attraction between surface‐carboxylates and cations increases the concentration of Zn2+ on the surface of MUDA/Zn to facilitate Zn plating/stripping with less overpotentials. The high concentration of Zn2+ also results in an increased number of nucleation sites, which enhances the lateral growth of Zn with no formation of dendrites. As a result, MUDA/Zn shows excellent stability during prolonged Zn plating/stripping within a wide range of pH. The advantageous properties of MUDA/Zn are also retained in full‐cells coupled with δ‐MnO2 cathodes.
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