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

Steve J. Clark, Da Wang, A. Robert Armstrong and Peter G. Bruce ()
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Steve J. Clark: University of Oxford
Da Wang: University of Oxford
A. Robert Armstrong: School of Chemistry and EastChem, University of St Andrews, North Haugh, Fife, Saint Andrews KY16 9ST, UK
Peter G. Bruce: University of Oxford

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Graphite, the dominant anode in rechargeable lithium batteries, operates at ∼0.1 V 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 1 V 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 1 V 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, 100 mV at C/2. To the best of our knowledge, the properties/performances of Li(V0.5Ti0.5)S2 exceed all previous 1 V electrodes.

Date: 2016
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DOI: 10.1038/ncomms10898

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