Role of zinc hydroxysulfates in the thermodynamics and kinetics of mild-acid Zn-MnO2 batteries

Ha, Kwang-Ho; Moon, Hyeonseok; Joo, Eun Ji; Jo, Duk Hyung; Lee, Kyu Tae

doi:10.1016/j.ensm.2023.103150

Cited by 2 publications

(1 citation statement)

References 104 publications

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“…The strength of the ZHS diffraction peak will decrease as the battery continues to charge, thanks to the extraction of H + from the cathode materials. Meanwhile, H + reacts with ZHS absorbed on the surface of the cathode, resulting in partial dissolution of ZHS . In addition, as the charging process continues, the diffraction peak of β-MnO 2 does not change significantly, indicating that the addition of CNT makes the structure of β-MnO 2 more stable.…”

Section: Resultsmentioning

confidence: 99%

CNT Composite β-MnO₂ with Fiber Cable Shape as Cathode Materials for Aqueous Zinc-Ion Batteries

Li,

Yin,

Han

et al. 2024

Inorg. Chem.

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Rechargeable aqueous zinc-ion batteries (AZIBs) have developed into one of the most attractive materials for largescale energy storage owing to their advantages such as high energy density, low cost, and environmental friendliness. Nevertheless, the sluggish diffusion kinetics and inherent impoverished conductivity affect their practical application. Herein, the β-MnO 2 composited with carbon nanotubes (CNT@M) is prepared through a simple hydrothermal approach as a high-performance cathode for AZIBs. The CNT@M electrode exhibits excellent cycling stability, in which the maximum specific discharge capacity is 259 mA h g −1 at 3 A g −1 , and there is still 220 mA h g −1 after 2000 cycles. The specific capacity is obviously better than that of β-MnO 2 (32 mA h g −1 after 2000 cycles). The outstanding electrochemical performance of the battery is inseparable from the structural framework of CNT and inherent high conductivity. Furthermore, CNT@M can form a complex conductive network based on CNTs to provide excellent ion diffusion and charge transfer. Therefore, the active material can maintain a long-term cycle and achieve stable capacity retention. This research provides a reasonable solution for the reliable conception of Mn-based electrodes and indicates its potential application in high-performance AZIB cathode materials.

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Section: Resultsmentioning

confidence: 99%

CNT Composite β-MnO₂ with Fiber Cable Shape as Cathode Materials for Aqueous Zinc-Ion Batteries

Li,

Yin,

Han

et al. 2024

Inorg. Chem.

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Revisiting the Charging Mechanism of α‐MnO₂ in Mildly Acidic Aqueous Zinc Electrolytes

Wu,

Li,

Xiang

et al. 2024

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In recent years, there have been extensive debates regarding the charging mechanism of MnO2 cathodes in aqueous Zn electrolytes. The discussion centered on several key aspects including the identity of the charge carriers contributing to the overall capacity, the nature of the electrochemical process, and the role of the zinc hydroxy films that are reversibly formed during the charging/discharging. Intense studies are also devoted to understanding the effect of the Mn2+ additive on the performance of the cathodes. Nevertheless, it seems that a consistent explanation of the α‐MnO2 charging mechanism is still lacking. To address this, a step‐by‐step analysis of the MnO2 cathodes is conducted. Valuable information is obtained by using in situ electrochemical quartz crystal microbalance with dissipation (EQCM‐D) monitoring, supplemented by solid‐state nuclear magnetic resonance (NMR), X‐ray diffraction (XRD) in Characterization of Materials, and pH measurements. The findings indicate that the charging mechanism is dominated by the insertion of H3O+ ions, while no evidence of Zn2+ intercalation is found. The role of the Mn2+ additive in promoting the generation of protons by forming MnOOH, enhancing the stability of Zn/α‐MnO2 batteries is thoroughly investigated. This work provides a comprehensive overview on the electrochemical and the chemical reactions associated with the α‐MnO2 electrodes, and will pave the way for further development of aqueous cathodes for Zn‐ion batteries.

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Role of zinc hydroxysulfates in the thermodynamics and kinetics of mild-acid Zn-MnO2 batteries

Cited by 2 publications

References 104 publications

CNT Composite β-MnO₂ with Fiber Cable Shape as Cathode Materials for Aqueous Zinc-Ion Batteries

CNT Composite β-MnO₂ with Fiber Cable Shape as Cathode Materials for Aqueous Zinc-Ion Batteries

Revisiting the Charging Mechanism of α‐MnO₂ in Mildly Acidic Aqueous Zinc Electrolytes

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Role of zinc hydroxysulfates in the thermodynamics and kinetics of mild-acid Zn-MnO2 batteries

Cited by 2 publications

References 104 publications

CNT Composite β-MnO2 with Fiber Cable Shape as Cathode Materials for Aqueous Zinc-Ion Batteries

CNT Composite β-MnO2 with Fiber Cable Shape as Cathode Materials for Aqueous Zinc-Ion Batteries

Revisiting the Charging Mechanism of α‐MnO2 in Mildly Acidic Aqueous Zinc Electrolytes

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About

CNT Composite β-MnO₂ with Fiber Cable Shape as Cathode Materials for Aqueous Zinc-Ion Batteries

CNT Composite β-MnO₂ with Fiber Cable Shape as Cathode Materials for Aqueous Zinc-Ion Batteries

Revisiting the Charging Mechanism of α‐MnO₂ in Mildly Acidic Aqueous Zinc Electrolytes