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钠离子电池Mo-Nb2O5/C负极材料的制备及性能研究
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Abstract:
采用水热法合成了Mo-Nb2O5/C纳米片复合材料，对该材料进行形貌、结构表征和电化学性能测试。结果表明，通过钼掺杂碳复合提高了Nb2O5纳米片材料的电子电导率，从而改善了Nb2O5材料的电化学性能。3% Mo-Nb2O5/C-8复合材料具有最佳的电化学性能，表现出优异的循环稳定性及倍率性能。在电流密度为100 mA g？1、电压范围在0.01~3.0 V的条件下，100周循环后，放电比容量为172.8 mAh g？1，容量保持率为84.9%；在500 mA g？1的高电流密度下，500周循环后，仍有119.2 mAh g？1的放电比容量，容量保持率为76.0%。
The Mo-Nb2O5/C nanosheet materials were prepared by hydrothermal method. Then, the structure and morphology of the Mo-Nb2O5/C anode material were analyzed by XRD, SEM, TEM and XPS characterization techniques, and their electrochemical performance for the sodium ion battery was tested and discussed. The results indicated that the electronic conductivity of Nb2O5 nanosheet materials was improved by molybdenum-doped and carbon composite, thus improving the electrochemical properties of Nb2O5 materials. The 3% Mo-Nb2O5/C-8 composites had the best electrochemical properties. The discharge specific capacity was 172.8 mAh g？1 with a capacity retention rate of 84.9% after 100 cycles at a current density of 100 mA g？1 and a voltage range of 0.01~3.0 V. At a high current density of 500 mA g？1, a discharge specific capacity of 119.2 mAh g？1 was achieved after 500 cycles, with a capacity retention rate of 76.0%.
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