All-solid-state lithium secondary battery with Li2 S-C composite positive electrode prepared by spark-plasma-sintering process

Tomonari Takeuchi, Hiroyuki Kageyama, Koji Nakanishi, Mitsuharu Tabuchi, Hikari Sakaebe, Toshiaki Ohta, Hiroshi Senoh, Tetsuo Sakai, Kuniaki Tatsumi

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Abstract

Electrochemically active lithium sulfide-carbon (Li2 S-C) composite positive electrodes, prepared by the spark plasma sintering process, were applied to all-solid-state lithium secondary batteries with a Li3 PO4 - Li2 S- SiS2 glass electrolyte. The electrochemical tests demonstrated that In/ Li2 S-C cells showed the initial charge and discharge capacities of ca. 1010 and 920 mAh g-1 - Li2 S, respectively, which showed higher discharge capacity and coulombic efficiency (ca. 91%) than the Li/ Li2 S-C cells with nonaqueous liquid electrolytes (ca. 200-380 mAh g-1 - Li2 S and ca. 27%, respectively). The ex situ S K-edge X-ray absorption fine structure measurements suggested the appearance and disappearance of elemental sulfur in the positive electrodes after charging and discharging, respectively, indicating that the ideal electrochemical reaction Li2S 2Li+S proceeded in the present all-solid-state cells. Such ideal electrochemical reaction, due probably to the suppression of the dissolution of Li2 S in the form of polysulfides into the electrolytes, would result in higher coulombic efficiency and discharge capacity as compared with those of the liquid-electrolyte cells.

Original languageEnglish
Pages (from-to)A1196-A1201
JournalJournal of the Electrochemical Society
Volume157
Issue number11
DOIs
Publication statusPublished - 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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