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

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Journal of the Electrochemical Society, 2013, 160 (2)
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The electrochemical properties of Na/TiS2cells fabricated from Na anodes and TiS2cathodes 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 TiS2has a complex reaction mechanism, the intercalation at the upper plateau region and the conversion at the low plateau region. Because, a distorted TiS2phase appeared in the upper plateau, a new phase of NaxTiS2was observed in the lower plateau, and the NaxTiS2phase was disappeared after full discharge from the XRD and TEM results. The decrease of discharge capacity during cycling is occurred from the formation of NaxTiS2phase in the cathode after full charging and is accumulated over cycling. © 2012 The Electrochemical Society.
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