CaCu共掺杂的O3-NaFe0.5Mn0.5O2钠离子电池正极材料的电化学性能研究
摘要：摘要层状过渡金属氧化物由于其较高的理论比容量和较低的经济成本,被视为一种具有良好应用前景的钠离子电池正极材料。采用溶胶-凝胶法和热处理的方式,制备Ca/Cu共掺杂的铁锰基层状氧化物（O3-Na0.9Ca0.05Fe0.45Mn0.45Cu0.1O2）。采用X射线衍射仪（XRD）、场发射扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）等对该O3型铁锰基层状氧化物正极材料进行表征分析。结果表明,在32 mA/g电流密度下该材料具有205.2 mAh/g的高比容量,循环50圈之后仍具有67.64%的容量保持率,在160 mA/g下循环100圈后依然具有81.4 mAh/g的放电比容量。由于Ca的掺入,引起Na+ 空位的增加,并且Cu的掺入提高了Mn的价态,从而提高了Na+ 的扩散速率,抑制了Mn3+ 的Jahn-Teller效应,缓解了晶格应力,有效提高了材料的结构稳定性和电化学性能。
Abstract:：Layered transition metal oxides were considered a promising cathode material for sodium ion batteries due to their high theoretical capacity and low economic cost. In this work, Ca/Cu co-doped Fe-Mn base layered oxides (O3-Na0.9Ca0.05Fe0.45Mn0.45Cu0.1O2) were prepared by sol-gel method and heat treatment. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS) were adopted to characterize the performance of the O3-type Fe-Mn base layered oxide cathode material. The results showed that the specific capacity of the material was as high as 205.2 mAh/g at 32 mA/g, and the capacity retention rate of 67.64% after 50 cycles. It also demonstrated a discharge specific capacity of 81.4 mAh/g at 160 mA/g after 100 cycles. The doping of Ca caused the increase of Na+ vacancies, and the doping of Cu raised the valence state of Mn, which increased the diffusion rate of Na+, suppressed the Jahn-Teller effect of Mn3+, and relieved the lattice stress, so that the structural stability and electrochemical properties of the material were effectively improved.
中文标题：CaCu共掺杂的O3-NaFe0.5Mn0.5O2钠离子电池正极材料的电化学性能研究
英文标题：Electrochemical Performance of Ca/Cu Co-Doped O3-NaFe0.5Mn0.5O2 as Cathode Material for Sodium-Ion Batteries
发表时间：2023-02-10
作者：
黎伦, 张尚尚, 李盛凯, 张海燕, 吴起白
作者简介：
黎伦（1997-）,男,硕士研究生,主要从事电化学储能材料与器件研究。张海燕（1957-）,女,博士,教授,博士生导师,主要从事电化学储能材料与器件研究。
关键词：O3-NaFe0.5Mn0.5O2,结构稳定性,正极材料,钠离子电池,
Key words：O3-NaFe0.5Mn0.5O2,structural stability,cathode material,sodium-ion batteries,
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