Highly reversible, dendrite-free and low-polarization Zn metal anodes enabled by a thin SnO₂layer for aqueous Zn-ion batteries

Abstract

Aqueous Zn-ion batteries (AZIBs) are attractive for next-generation renewable and secure energy storage systems due to their high safety and low cost. However, dendrite growth and side reactions of Zn...

Interfacial Modification of a Zn Anode by Amorphous Se toward Long-Life and Hydrogen Evolution-Free Aqueous Rechargeable Batteries

“…So far, much effort has been put to improve the electrochemical reversibility of Zn anodes by means of constructing 3D conductive hosts, − electrolyte additives, or surface coatings. − Nevertheless, organic additives in the aqueous electrolyte may reduce ionic conductivity . For the coating technology, normally, the first step was the ex situ preparation of coating materials, which was then applied onto the Zn foil surface through a slurry-coating process.…”

Synergistically Stabilizing Zinc Anodes by Molybdenum Dioxide Coating and Tween 80 Electrolyte Additive for High-Performance Aqueous Zinc-Ion Batteries

“…Thus, Tw80, as a nonionic surfactant, can help to improve the surface wettability between Zn electrode and electrolyte, which may assist in the uniform distribution of Zn 2+ ions. Meanwhile, the MoO 2 coating layer plays a more pronounced role in significantly reducing the contact angle to almost 0° in the solutions with and without Tw80 (Figure S18c,d), making the coated Zn surface superhydrophilic in the electrolyte possibly by enhancing the surface roughness or heterogeneity. , It has been reported that the electrode wettability plays a role in the final Zn deposition pattern and high surface hydrophilicity will result in more uniform Zn 2+ flux across the surface of MoO 2 @Zn anodes, contributing to homogeneous Zn nucleation and growth . Consequently, the MoO 2 coating provides improved electrolyte–anode interfaces and hence enhances Zn 2+ transport kinetics.…”

“…Furthermore, MoO 2 coating can significantly enhance surface hydrophilicity to improve the wetting of electrolyte on the Zn electrode, which is beneficial for reducing the desolvation energy of hydrated Zn ions . To determine the activation energy of Zn 2+ desolvation under the protection of diverse MoO 2 coatings, EIS measurements of diverse MoO 2 @Zn symmetric cells in ZnSO 4 +1Tw80 electrolyte were conducted at the temperature range from 30 to 60 °C.…”

“… 59 , 60 It has been reported that the electrode wettability plays a role in the final Zn deposition pattern and high surface hydrophilicity will result in more uniform Zn 2+ flux across the surface of MoO 2 @Zn anodes, contributing to homogeneous Zn nucleation and growth. 61 Consequently, the MoO 2 coating provides improved electrolyte–anode interfaces and hence enhances Zn 2+ transport kinetics.…”

Optimizing NCM811 nickel-rich cathode stability via suppressing asymmetric Li/Ni mixing by a “non-intrusive” strategy

“…45 The ratio of (003) peak intensity to (104) peak intensity is widely employed to estimate Li + /Ni 2+ mixing in layered structures. 46 A higher I 003 / I 104 value indicates lower cation mixing. An I 003 / I 104 value exceeding 1.2 generally indicates an acceptable Li/Ni mixing rate.…”