Abstract
A dual functional CNTs@graphene/CNTs cathode for Li–Se battery was constructed by a CNTs@graphene network and a CNTs interlayer. CNTs were first integrated with graphene to form a three-dimensional (3D) framework and work together as a conductive matrix for Se confinement. The optimized composite cathode delivers a high initial capacity of 575 mAh·g−1 at 0.5 A·g−1 and good rate capacity with a retained capacity of 479 mAh·g−1 at 2.0 A·g−1 (73% of the capacity at 0.2 A·g−1). CNTs were further served as an interlayer to confine the diffusion of polyselenides by constructing a thin CNTs layer outside the CNTs@graphene network. An improved initial capacity of 616 mAh·g−1 at 0.5 A·g−1 is achieved with a retained capacity of 538 mAh·g−1 after 80 cycles, indicating the effective dual function of CNTs in this novel cathode construction and great application potential for Li–Se battery.
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Acknowledgements
This study was financially supported by the National Basic Research Program of China (No. 2014CB932400) and the National Science Foundation of China (Nos. 21406161 and 51602220).
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Li, J., Zhang, C., Wu, CJ. et al. Improved performance of Li–Se battery based on a novel dual functional CNTs@graphene/CNTs cathode construction. Rare Met. 36, 425–433 (2017). https://doi.org/10.1007/s12598-017-0903-z
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DOI: https://doi.org/10.1007/s12598-017-0903-z