Promise of dual carbon batteries with graphene-like graphite as both electrodes

Inamoto, Junichi; Enoki, Shoya; Inoo, Akane; Tamura, Noriyuki; Matsuo, Yoshiaki

doi:10.1016/j.carbon.2023.118512

Cited by 5 publications

References 64 publications

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Electrochemical intercalation of anions into graphite: Fundamental aspects, material synthesis, and application to the cathode of dual‐ion batteries

Matsuo,

Inoo,

Inamoto

2024

ChemistryOpen

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In this review, fundamental aspects of the electrochemical intercalation of anions into graphite have been first summarized, and then described the electrochemical preparation of covalent‐type GICs and application of graphite as the cathode of dual‐ion battery. Electrochemical overoxidation of anion GICs provides graphite oxide and covalent‐fluorine GICs, which are key functional materials for various applications including energy storage devices. The reaction conditions to obtain fully oxidized graphite has been mentioned. Concerning the application of graphite for the cathode of dual‐ion battery, it stably delivers about 110 mA h g−1 of reversible capacity in usual organic electrolyte solutions. The combination of anion and solvent as well as the concentration of the anions in the electrolyte solutions greatly affect the performance of graphite cathode such as oxidation potential, rate capability, cycling properties, etc. The interfacial phenomenon is also important, and fundamental studies of charge transfer resistance, anion diffusion coefficient, and surface film formation behavior have also been summarized. The use of smaller anions, such as AlCl4−, Br− can increase the capacity of graphite cathode. Several efforts on the structural modification of graphite and development of electrolyte solutions in which graphite cathode delivers higher capacity were also described.

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Electrochemical intercalation of anions into graphite: Fundamental aspects, material synthesis, and application to the cathode of dual‐ion batteries

Matsuo,

Inoo,

Inamoto

2024

ChemistryOpen

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Electrochemical Chlorozincate Anion Intercalation into Layered Carbon Materials for the Cathodes of Aqueous Zinc Metal Secondary Batteries

Inoo,

Inamoto,

Nakanishi

et al. 2024

Chem. Mater.

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Aqueous zinc metal secondary batteries (ZSBs) are expected to be next-generation secondary batteries, and it is important to explore cathode materials and electrolyte solutions that exhibit excellent electrochemical properties for their practical use. In this study, we employed a layered carbon material named graphene-like graphite (GLG) as a cathode active material and a concentrated aqueous zinc chloride solution as an electrolyte solution, and its electrochemical anion intercalation reaction was investigated. As a result, GLG obtained at 300 °C of thermal treatment (GLG300) exhibited lower anion intercalation potential and better Coulombic efficiency in ZnCl 2 •2.33H 2 O compared to graphite and GLG obtained at 700 °C. X-ray diffraction measurement suggested that GLG300 formed a stage-1 intercalation compound at 1.8 V vs Zn 2+ /Zn, and extended X-ray absorption fine structure analysis revealed that the intercalated anion was hydrated [ZnCl 4 ] 2− . The initial discharge capacity of GLG300 was approximately 170 mAh g −1 in the potential range of 0.5−2.2 V with a current density of 20 mA g −1 . The charge−discharge cycling test showed that GLG300 had good reversibility, the discharge capacity remained above 110 mAh g −1 , and the Coulombic efficiency approached nearly 100% at the 50th cycle. These results demonstrated that the system using GLG300 and concentrated aqueous zinc chloride solution exhibits excellent cathode properties as aqueous ZSBs and showed great promise for their future practical use.

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Unraveling the Factors of Host Materials Affecting the Kinetics of Electrochemical Anion Intercalation Reaction

Inamoto,

Enoki,

Miyamoto

et al. 2024

ACS Appl. Energy Mater.

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Electrochemical intercalation reactions of various ions into host materials are used as electrode reactions for various secondary batteries, and it is important to understand the factors that affect the reaction kinetics. In this study, the activation energies of internal anion diffusion and interfacial anion transfer were evaluated using carbon materials with different properties by electrochemical impedance spectroscopy, and the factors of the materials affecting activation energies of these processes were investigated. It was found that the activation energies of internal anion diffusion were dominated by the oxygen content in the carbon materials, and they linearly increased with increasing oxygen content. On the other hand, the activation energy of interfacial anion transfer increased with increasing oxygen content near the edge surface of the material and decreased with increasing the initial interlayer distance. Therefore, it was revealed that the difference in the properties of the host material affects the activation energy of interfacial ion transfer in the case of anion transfer, which has low desolvation energy, unlike the case of lithiumion transfer, which requires large desolvation energy. It suggests that the design of active materials become more important than ever for next-generation secondary batteries which employ reactions with small desolvation energies for superior rate capabilities.

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Promise of dual carbon batteries with graphene-like graphite as both electrodes

Cited by 5 publications

References 64 publications

Electrochemical intercalation of anions into graphite: Fundamental aspects, material synthesis, and application to the cathode of dual‐ion batteries

Electrochemical intercalation of anions into graphite: Fundamental aspects, material synthesis, and application to the cathode of dual‐ion batteries

Electrochemical Chlorozincate Anion Intercalation into Layered Carbon Materials for the Cathodes of Aqueous Zinc Metal Secondary Batteries

Unraveling the Factors of Host Materials Affecting the Kinetics of Electrochemical Anion Intercalation Reaction

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