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

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Summary Zinc‐ion batteries (ZIBs) are considered a candidate for lithium‐ion batteries owing to their low cost, eco‐friendly nature, and high safety level. In particular, their energy density is high because of a two‐electron transfer mechanism involving Zn ions. However, ZIBs have the demerits of low‐rate capability and poor cycling life because of the dissolution of Mn in the electrolyte during charging and discharging, which prevents the high potential of ZIBs from being effectively utilized. In this study, a manganese sulfate (MnSO4) additive was introduced in the electrolyte to overcome these drawbacks. A ZIB with such an electrolyte exhibited stable capacity behavior and high cycling stability. Furthermore, the fabricated ZIBs showed a specific capacity of 289 mAh g−1 at a current density of 0.3 A g−1, improved rate‐performance of 116 mAh g−1 at a current density of 2.0 A g−1, and excellent long‐term stability of 72% for 200 cycles at a current density of 1.0 A g−1. These findings indicate that the use of the aforementioned additive is a promising for enhancing the electrochemical performance of manganese‐based cathodes in electrolyte‐optimized next‐generation ZIBs.

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

Park

2022

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Freestanding V ₅ O ₁₂ · 6H ₂ O‐CNTs composite films as cathode for foldable aqueous zinc‐ion batteries

Zhang

Huang

et al. 2022

Advanced wearable portable electronic products are needed energy storage devices with foldable properties. Zinc-ion batteries (ZIBs) are one of the most promising alternatives for energy storage devices due to their significant advantages, such as low cost, high reliability, and safety for folding. Herein, V 5 O 12 Á 6H 2 O (VOH) was obtained by facile electrodeposition strategy on carbon nanotube (CNTs) film, forming the freestanding V 5 O 12 Á 6H 2 O-CNTs (VOH-CNTs) composite films. The resultant VOH-CNTs composite films with high mechanical properties can be directly used as the cathode for foldable aqueous zinc-ion batteries (AZIBs). The VOH-CNTs electrode at a current density of 1 A g À1 shows a high specific capacity of 356 mAh g À1 and the capacity retention of 96% after 500 cycles. Even a reversible specific capacity of 292 mAh g À1 can be achieved at a current density of 5 A g À1 and the capacity retention of 93% after 4000 cycles. A high coulombic efficiency stays nearly 100%. The electrochemical properties of the prepared cells measured in different folding states remain stable, indicating the devices are suitable for use as foldable energy storage devices.

Zinc‐ion battery based on heteroatom‐doped improved‐quality graphene film as a functional current collector

Kim

2022

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