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Wenwu Li et al Energy Env. Sci."ZnSe Nanostructures: Synthesis, Properties and Applications."

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Layered Phosphorus-Like GeP5: a Promising Anode Candidate with High Initial Coulombic Efficiency and Large Capacity for Lithium Ion Batteries

Wenwu Li, Huiqiao Li,* Zhijuan Lu, Lin Gan, Linbo Ke, Tianyou Zhai* and Haoshen Zhou

   

In this work, we for the first time investigate GeP5 as an anode material for lithium ion batteries (LIB). By a facile high energy mechanical ball milling (HEMM) method, we successfully synthesize pure GeP5 and GeP5/C nanocomposite at ambient temperature and pressure. According to XRD Rietveld refinement and first principle calculation, GeP5 holds an two-dimensional layered structure similar to black P and graphite, a high conductivity as 10000 and 10 times of black P and graphite, respectively. Serving as novel anode materials, both GeP5 and its carbon composite deliver an unprecedented high reversible capacity of ca. 2300 mA h g-1, combined with a high initial coulombic efficiency of ca. 95%. Ex-situ XRD and CV tests demonstrate GeP5 undergoes conversion and alloying type lithium storage mechanism that its capacity is co-contributed by both Ge and P components. In addition, GeP5/C exhibits superior cycle stability and excellent high-rate performance with a capacity of 2127 mA h g-1 at 5 A g-1, suggesting their promising application in next-generation high-energy and high-power LIB.


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