Carbon coated CoS<inf>2</inf>thermal battery electrode material with enhanced discharge performances and air stability

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Journal Article
Electrochimica Acta, 2017, 231 pp. 287 - 293
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© 2017 Cobalt disulfide (CoS2) is a promising thermal battery electrode material for its superior thermal stability and discharge performance. However, the low natural resource and poor air stability restrict its application in thermal battery fabrication. In this work, carbon coated CoS2composite was prepared by a facile one-pot hydrothermal method with glucose as carbon source. During the growth of CoS2, the glucose molecules were in situ adsorbed and carbonized on the surface of the as-synthesized CoS2, and the resultant carbon coating provided improved electrical conductivity and discharge performances to the composite. The thermal battery cell, which was fabricated with such a composite cathode and with a Li-Si anode, can output a capacity of 235.8 mAh g−1and an energy density of 416.9 Wh kg−1at a cut-off voltage of 1.7 V. This carbon coated CoS2composite also presented enhanced air stability. After being stored in dry air for 3 months, the composite can still provide a capacity of 232.4 mAh g−1to 1.7 V, whereas the capacity of bare CoS2stored with the same condition dropped from 202.4 mAh g−1to 189.7 mAh g−1.
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