Rock-salt-type lithium metal sulphides as novel positive-electrode materials

Atsushi Sakuda, Tomonari Takeuchi, Kazuhiro Okamura, Hironori Kobayashi, Hikari Sakaebe, Kuniaki Tatsumi, Zempachi Ogumi

Research output: Contribution to journalArticlepeer-review

Abstract

One way of increasing the energy density of lithium-ion batteries is to use electrode materials that exhibit high capacities owing to multielectron processes. Here, we report two novel materials, Li2TiS3 and Li3NbS4, which were mechanochemically synthesised at room temperature. When used as positive-electrode materials, Li2TiS3 and Li3NbS4 charged and discharged with high capacities of 425 mA h g-1 and 386 mA h g-1, respectively. These capacities correspond to those resulting from 2.5- and 3.5-electron processes. The average discharge voltage was approximately 2.2 V. It should be possible to prepare a number of high-capacity materials on the basis of the concept used to prepare Li2TiS3 and Li3NbS4.

Original languageEnglish
Article number4883
JournalScientific reports
Volume4
DOIs
Publication statusPublished - May 8 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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