Unveiling pseudocapacitive behavior of hard carbon anode materials for sodium-ion batteries

Zoia V. Bobyleva, Oleg A. Drozhzhin, Kirill A. Dosaev, Azusa Kamiyama, Sergey V. Ryazantsev, Shinichi Komaba, Evgeny V. Antipov

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Hard carbon is the most prospective anode material for sodium-ion batteries with outstanding electrochemical performance. However, the type of reaction associated with charge storage is a subject of contentious deliberations within the scientific society. We examined the pseudocapacitive behavior of glucose-derived hard carbon with different porosity by detailed linear sweep voltammetric analysis which demonstrated the presence of three distinct processes occurring during Na+-deinsertion. A combination of pseudocapacitive-intercalation-pseudocapacitive behavior for all synthesized hard carbons is proposed. Obtained results differ drastically from the behavior demonstrated by graphite/Li cell, soft carbon/Na cell and pure Na metal plating.

Original languageEnglish
Article number136647
JournalElectrochimica Acta
Volume354
DOIs
Publication statusPublished - 10 Sep 2020

Keywords

  • Anode material
  • Hard carbon
  • Intercalation
  • Na-ion batteries
  • Pseudocapacity
  • Sodiation mechanism

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