Li(V0.5Ti0.5)S2 as a 1V lithium intercalation electrode

Steve J. Clark, Da Wang, A. Robert Armstrong, Peter G. Bruce

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)
1 Downloads (Pure)

Abstract

Graphite, the dominant anode in rechargeable lithium batteries, operates at ~0.1V versus Li+/Li and can result in lithium plating on the graphite surface, raising safety concerns. Titanates, for example, Li4Ti5O12, intercalate lithium at ~1.6 V versus Li+/Li, avoiding problematic lithium plating at the expense of reduced cell voltage. There is interest in 1V anodes, as this voltage is sufficiently high to avoid lithium plating while not significantly reducing cell potential. The sulfides, LiVS2 and LiTiS2, have been investigated as possible 1V intercalation electrodes but suffer from capacity fading, large 1st cycle irreversible capacity or polarization. Here we report that the 50/50 solid solution, Li1+x(V0.5Ti0.5)S2, delivers a reversible capacity to store charge of 220 mAhg-1 (at 0.9 V), 99% of theoretical, at a rate of C/2, retaining 205 mAhg-1 at C-rate (92% of theoretical). Rate capability is excellent with 200 mAhg-1 at 3C. C-rate is discharge in 1 h. Polarization is low, 100mV at C/2. To the best of our knowledge, the properties/performances of Li(V0.5Ti0.5)S2 exceed all previous 1V electrodes.
Original languageEnglish
Article number10898
Pages (from-to)1-7
Number of pages7
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 21 Mar 2016

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