High-Capacity Hard Carbon Synthesized from Macroporous Phenolic Resin for Sodium-Ion and Potassium-Ion Battery

Azusa Kamiyama, Kei Kubota, Takeshi Nakano, Shun Fujimura, Soshi Shiraishi, Hidehiko Tsukada, Shinichi Komaba

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Hard carbon is synthesized by heat-treating macroporous phenolic resin at different temperatures. We study influences of temperature on the structures and electrode properties of the hard carbon in Na and K cells. X-ray diffraction and scattering data of the samples confirm the decreased interlayer distance between sp2-carbon sheets and the expanded internal pores at the raised temperatures from 1100 to 1500 °C. Reversible capacities in Na cells increase with an increase in the heat-treatment temperature. Hard carbon carbonized at 1500 °C delivers the largest capacities of 386 and 336 mAh g-1 at 10 mA g-1 in Na and K cells, respectively.

Original languageEnglish
Pages (from-to)135-140
Number of pages6
JournalACS Applied Energy Materials
Volume3
Issue number1
DOIs
Publication statusPublished - 27 Jan 2020

Keywords

  • hard carbon
  • insertion mechanism
  • negative electrode materials
  • nongraphitizable carbon
  • potassium-ion batteries
  • rechargeable batteries
  • sodium-ion batteries

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