3D spongy CoS 2 nanoparticles/carbon composite as high-performance anode material for lithium/sodium ion batteries

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Chemical Engineering Journal, ISSN: 1385-8947, Vol: 332, Page: 370-376

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Zhang, Yaohui; Wang, Nana; Sun, Changhui; Lu, Zhenxiao; Xue, Pan; Tang, Bin; Bai, Zhongchao; Dou, Shi Xue
Elsevier BV
Chemistry; Environmental Science; Chemical Engineering; Engineering; Physical Sciences and Mathematics
article description
A spongy CoS 2 /carbon composite assembled from CoS 2 nanoparticles (∼20 nm) homogeneously anchored on a spongy carbon matrix was synthesized through a facile freeze-drying method and a hydrothermal process. As anode material for lithium/sodium ion batteries (LIBs/SIBs), this composite shows significantly enhanced lithium/sodium storage performance with the synergetic effects due to the electrical conductivity of the carbon matrix and the porous structure, which provide buffer spaces for volume expansion during charge/discharge processes and feasible transfer pathways for electrons/ions. The electrochemical results demonstrate that the spongy CoS 2 /carbon composite is an outstanding anode material for LIBs and SIBs. It delivers a high specific capacity of 610 mAh g −1 at 500 mA g −1 after 120 cycles in LIBs and 330 mAh g −1 at 500 mA g −1 after 60 cycles in SIBs, respectively. Moreover, the freeze-drying/hydrothermal process developed in this work could be useful for the construction of many other high-capacity metal sulfide composites as electrode materials for sodium ion batteries.