Abstract
Transition-metal phosphides (TMPs) have emerged as anode materials for lithium-ion batteries owing to their high theoretical capacity and stable cyclability. Moreover, by increasing the content of P in TMPs, their lithium storage performance can be further improved. However, the decreased electrical conductivity caused by continuous increment of the P doping into metal and the large volume change during the lithiation/delithiation process limit the electrical energy storage applications of such materials. The combination of the advantages of graphene and a hollow structure is regarded as an approach to solve these issues. In this work, CoP nanocages wrapped by reduced graphene oxide (CoP@RGO) were fabricated via a template-based method followed by a low-temperature phosphating process. Such a unique structure can not only accommodate the volume change during the lithiation/delithiation process but also improve the electric conductivity of the CoP nanocages. The obtained CoP@RGO nanocages exhibited remarkable stable capacity of 546.6 mA h g−1 at current density of 100 mA g−1 over 500 cycles (or 460.4 mA h g−1 at current density of 500 mA g−1 over 500 cycles).
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21773062, 21577036, 21377038, 5171101651), State Key Research Development Program of China (2016YFA0204200), Shanghai Education Development Foundation and Shanghai Municipal Education Commission (16JC1401400), Shanghai Pujiang Program (17PJD011), and Fundamental Research Funds for the Central Universities (22A201514021).
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Du, M., Qiu, B., Zhu, Q. et al. Cobalt phosphide nanocages encapsulated with graphene as ultralong cycle life anodes for reversible lithium storage. Res Chem Intermed 44, 7847–7859 (2018). https://doi.org/10.1007/s11164-018-3590-y
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DOI: https://doi.org/10.1007/s11164-018-3590-y