钠离子电池用多孔α-Fe_2O_3纳米球负极材料的制备与电化学性能

Preparation and Electrochemical Performance of Porous α-Fe_2O_3 Nanospheres Anode Materials for Na-Ion Batteries

随着大规模储能领域的发展,钠离子电池逐渐得到了更多的关注,其中氧化铁负极材料具有成本低、无毒性和高理论容量的优点。采用水热法和牺牲模板法制备了多孔α-Fe_2O_3纳米球。结果表明,这种材料作为钠离子电池负极,展示出良好的电化学性能,在循环过程中,其独特的结构可以适应大体积变化并促进电子和电解液的交换。在50 m A/g的电流密度下,首次放电比容量达到520 m Ah/g。由于合成技术简单,性能优异,多孔α-Fe_2O_3纳米球在钠离子电池负极材料方面有巨大的应用潜力。

With the development of large-scale energy storage, sodium-ion batteries have gradually received more attention. Iron oxide is cheap, with non-toxicity and high theoretical capacity which make it promising as the dominant anode material for commercial scale sodium storage. Porous α-Fe_2O_3 nanospheres were prepared by the simple hydrothermal method and carbon-template method. The nano-material exhibits high-rate capability and long-term cyclability when applied as an anode material for Na-ion batteries(SIBs). As a result, porous α-Fe_2O_3 nanospheres show an initial discharge specific capacity up to 520 m Ah/g at a current density of 50 m A/g. Due to their simple synthesis technique and high electrochemical performance, porous α-Fe_2O_3 nanospheres have a great potential as anode materials for rechargeable SIBs. The unique structure of the porous α-Fe_2O_3 nanospheres offers a synergistic effect to alleviate stress, accommodate large volume change, and facilitate the transfer of electrons and electrolyte during prolonged cycling.