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Electrochemical characterization of non-stoichiometric Cu2S x cathode for lithium batteries

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Abstract

Electrochemical performances of non-stoichiometric Cu2S x (1.25 ≤ x ≤ 0.625) cathodes prepared by spray pyrolysis and followed annealing were investigated after coating on carbon fiber paper (CFP) and Cu foil current collectors. The chemical composition influence on the electrochemical properties of Cu2S x was noticeably observed on a Cu foil current collector, especially at higher charge-discharge rates. Electrochemical impedance spectroscopy revealed that Cu/S ≈ 3.2 M ratio electrode shows lower interfacial charge transfer resistance (R ct) after 5 cycles at 0.1 C compared with Cu/S ≈ 1.6 M ratio electrode on both current collectors. Accordingly, the electrode with Cu/S ≈ 3.2 M ratio showed the highest discharge capacity of 350 mAh g−1 at 5 C on a Cu foil current collector. The excess of Cu in Cu2S x enhanced electrode utilization with the cycle number and facilitated fast charge transfer.

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Acknowledgements

This research was partially supported by the Ministry of Education, Culture, Sports, Science and Technology of Japan (Grant No. 15H04251).

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Correspondence to Izumi Taniguchi.

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Kalimuldina, G., Taniguchi, I. Electrochemical characterization of non-stoichiometric Cu2S x cathode for lithium batteries. J Solid State Electrochem 21, 3057–3063 (2017). https://doi.org/10.1007/s10008-017-3625-0

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  • DOI: https://doi.org/10.1007/s10008-017-3625-0

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