Electrochemical properties and discharge mechanism of Na/TiS<inf>2</inf>cells with liquid electrolyte at room temperature

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Journal Article
Journal of the Electrochemical Society, 2013, 160 (2)
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The electrochemical properties of Na/TiS 2 cells fabricated from Na anodes and TiS 2 cathodes and 1M sodium trifluoromethanesulfonate in tetraethyleneglycol dimethylether liquid electrolyte have been investigated. The discharge curve has two plateau regions of 2.1 V and 1.6 V. The loss of discharge capacity appeared mainly in the upper plateau (UP) region (2.0-2.6 V) and the discharge capacity in the low plateau (LP) region (0.8-2.0 V) does not decrease and is consistent during 40 cycles. The discharge process between Na and TiS 2 has a complex reaction mechanism, the intercalation at the upper plateau region and the conversion at the low plateau region. Because, a distorted TiS 2 phase appeared in the upper plateau, a new phase of Na x TiS 2 was observed in the lower plateau, and the Na x TiS 2 phase was disappeared after full discharge from the XRD and TEM results. The decrease of discharge capacity during cycling is occurred from the formation of Na x TiS 2 phase in the cathode after full charging and is accumulated over cycling. © 2012 The Electrochemical Society.
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