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Controllable Insertion Mechanism of Expanded Graphite Anodes Employing Conversion Reaction Pillars for Sodium-Ion Batteries. | LitMetric

Controllable Insertion Mechanism of Expanded Graphite Anodes Employing Conversion Reaction Pillars for Sodium-Ion Batteries.

ACS Appl Mater Interfaces

Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul 04310, Republic of Korea.

Published: May 2021

AI Article Synopsis

  • - The study focuses on enhancing carbonaceous anode materials for sodium-ion batteries by using a modified expanded graphite (EG) with MoS pillars, aiming to improve their performance.
  • - By adjusting the thermal treatment of EG-MoS, researchers achieved better control over the reaction mechanisms, resulting in an anode (EG-MoS-900) that can deliver a high capacity of 501 mAh/g.
  • - The formation of a solid electrolyte interface (SEI) layer on the anode surface significantly improved wear and tear issues, increasing efficiency from 52.20% to 97.25%, suggesting a promising direction for future alkali-ion battery development.

Article Abstract

Controlling the structural and reaction characteristics of carbonaceous anode materials is essential to realizing alternative alkali-ion batteries. In this study, we report on expanded graphite material employing MoS conversion reaction pillars (EG-MoS) inserted into the interlayers and assess them as potential anode candidates for Na-ion batteries. We succeed in a tailored control of the insertion characteristics between one-phase reaction and two-phase reaction by modifying the crystal structure of EG-MoS under different thermal treatment conditions. EG-MoS-900 anode with an enlarged interlayer of ∼5.38 Å delivers an exceptionally high capacity of 501 mAh g. We successfully solve the irreversible capacity issues of the expanded graphite materials by forming chemical preformation of the solid electrolyte interface (SEI) layer on the electrode surface, thereby significantly increasing coulombic efficiencies of thermally tuned EG-MoS (52.20 → 97.25%). We elucidate the electrochemical mechanism and structural properties of the EG-MoS anode materials by characterizations. Inserting active sulfide pillars enables us to overcome the performance limitations of existing Na-ion battery technologies, and we expect that this strategy will be applied to realize another family of alkali-ion batteries.

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Source
http://dx.doi.org/10.1021/acsami.1c05928DOI Listing

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