Despite a significant advancement in preparing metastable materials, one common problem is the strict and precious reaction conditions due to their metastable structures. Herein, we achieved the preparation of high-temperature stabilized metastable α-MoC1-x by mounting zinc atoms into its lattice structure. Such a structural construction could suppress the phase transformation from α-MoC1-x to β-Mo2 C through restricting the displacement of Mo atoms upon increased temperature. The resultant metastable α-MoC1-x can be stabilized up to 1000 °C and this stability temperature is the highest for the metastable α-MoC1-x so far. Synchrotron X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) confirm the structure of Zn-mounted α-MoC1-x . Density functional theory (DFT) calculations reveal that the introduction of the Zn atoms in the lattice structure of α-MoC1-x could significantly decrease the energy difference (ΔE) between α-MoC1-x and β-Mo2 C, thus effectively suppressing the phase transformation from α-MoC1-x to β-Mo2 C and accordingly maintaining the high-temperature stability of α-MoC1-x . This novel strategy can be used as a universal method to be extended to synthesize metastable α-MoC1-x from different precursors or other mounted elements. Moreover, the optimal product exhibits excellent lithium storage performances in terms of the cycling stability and rate performance.
Keywords: high-temperature stability; lithium-ion battery; metastable; molybdenum carbide; mounted atoms.
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