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Research Article

Nanosheet-stacked flake graphite for high-performance Al storage in inorganic molten AlCl3-NaCl salt

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  • Received: 23 March 2020Revised: 17 April 2020Accepted: 22 April 2020Available online: 24 April 2020
  • Aluminum storage system with graphite as cathode, due to ultra-stable cycling stability, high capacity and good safety, is greatly promoting the development of state-of-the-art rechargeable aluminum battery in the last 5 years. In this work, it confirms that flake graphite stacked with noticeably small and thin graphene nanosheets exhibits high capacity and fare good rate capability in low-cost AlCl3-NaCl inorganic molten salt. The battery can achieve high capacity of ~219 mAh•g-1 over 1200 cycles at high current density of 5 A•g-1, with Coulombic efficiency of 94.1%. Moreover, a clear understanding about reaction mechanism is demonstrated that flake graphite with small and thin graphene nanosheets and high mesopore structures consists of not only the intercalation of AlCl4- anions between graphene layers, but also the adsorption of AlCl4- anions within mesopores; whereas well stacked and highly parallel layered large-size expandable graphite mainly involves the intercalation of AlCl4- anions.
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Nanosheet-stacked flake graphite for high-performance Al storage in inorganic molten AlCl3-NaCl salt

  • Corresponding authors:

    Ji-guo Tu    E-mail: guo15@126.com

    Hong-min Zhu    E-mail: hzhu@material.tohoku.ac.jp

  • 1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
  • 2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
  • 3. Department of Metallurgy, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 9808579, Japan

Abstract: Aluminum storage system with graphite as cathode, due to ultra-stable cycling stability, high capacity and good safety, is greatly promoting the development of state-of-the-art rechargeable aluminum battery in the last 5 years. In this work, it confirms that flake graphite stacked with noticeably small and thin graphene nanosheets exhibits high capacity and fare good rate capability in low-cost AlCl3-NaCl inorganic molten salt. The battery can achieve high capacity of ~219 mAh•g-1 over 1200 cycles at high current density of 5 A•g-1, with Coulombic efficiency of 94.1%. Moreover, a clear understanding about reaction mechanism is demonstrated that flake graphite with small and thin graphene nanosheets and high mesopore structures consists of not only the intercalation of AlCl4- anions between graphene layers, but also the adsorption of AlCl4- anions within mesopores; whereas well stacked and highly parallel layered large-size expandable graphite mainly involves the intercalation of AlCl4- anions.

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