CuSbS2 as a negative electrode material for sodium ion batteries

JOURNAL OF POWER SOURCES

卷:342

Article

Marino, C.¹  Block, T.²  Poettgen, R.²  Villevieille, C.¹ 

[1] Paul Scherrer Inst, Electrochem Lab, Villigen, Switzerland

[2] Univ Munster, Inst Anorgan & Analyt Chem, Munster, Germany

关键词: Negative electrode;    Na-ion battery;    Ternary phase;    Conversion material;   

DOI  :  10.1016/j.jpowsour.2016.12.100

来源: Elsevier

【 摘 要 】

CuSbS2 was tested as a negative electrode material for sodium-ion batteries. The material synthesized by ball milling offers a specific charge of 730 mAh g(-1), close to the theoretical value (751 mAh g(-1)), over a few cycles. The reaction mechanism was investigated by means of operando X-ray diffraction, (121)sb MOssbauer spectroscopy, and Cu k-edge X-ray absorption spectroscopy. These studies reveal a sodiation mechanism that involves an original conversion reaction in two steps, through the formation of a ternary phase, CuSb(1-x)S(2-y), as well as a NaxS alloy and Sb, followed by an lloying reaction involving the previously formed Sb. The desodiation process ends with the reformation of the ternary phase, CuSb(1-x')S(2-y'), deficient in Sb and S; this phase is responsible for the good reversibility observed upon cycling. (C) 2016 Published by Elsevier B.V.

【 授权许可】

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