Two-step addition of acetylene black to hydrated sodium manganese oxide: Its effect on the performance of rapid discharge cathode

Mitsuhiro Hibino, Hirokazu Kawaoka, Haoshen Zhou, Itaru Honma

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Hydrated sodium manganese oxide (HSMO) was synthesized by reducing sodium permanganate with ethanol. The discharge and charge properties for mixtures of HSMO and acetylene black (AB) were investigated. AB was added twice, first while synthesizing HSMO and next while preparing the electrode. AB in synthesis resulted in the appearance of an additional redox reaction below 2V versus Li/Li+ and was effective in enlarging the discharge and charge capacity. On the other hand, AB added during electrode fabrication reduced resistance and improved cycle performance. In discharge-charge tests using 10 Ag-1 HSMO, 45 mAh g-1 composite of specific capacity could be maintained after 10 cycles, if AB was added at levels (in weight ratio to HSMO) of 0.25 during synthesis and 0.75 in electrode fabrication, or 0.5 and 0.5, respectively. This current and capacity corresponded to a power density of 10 kW kg-1 and an energy density of 90 Wh kg-1, assuming an operating voltage of 2.0 V.

Original languageEnglish
Pages (from-to)143-147
Number of pages5
JournalJournal of Power Sources
Volume124
Issue number1
DOIs
Publication statusPublished - 2003 Oct 1
Externally publishedYes

Keywords

  • Cathode material
  • Composite material
  • Lithium battery
  • Rapid discharge
  • Sodium manganese oxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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