Zheng Ya-Min, Huang Xiao-Bao, Meng Xiao-Meng, Xu Shou-Dong, Chen Liang, Liu Shi-Bin, Zhang Ding
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
ACS Appl Mater Interfaces. 2021 Sep 29;13(38):45528-45537. doi: 10.1021/acsami.1c12684. Epub 2021 Sep 14.
Considering the abundance of iron and manganese within the Earth's crust, the cathode O3-NaFeMnO has shown great potential for large-scale energy storage. Following the strategy of introducing specific heteroelements to optimize the structural stability for energy storage, the work has obtained an O3-type NaFeMnCuZrO that exhibits enhanced electrochemical performance and air stability. It displays an initial reversible capacity of 147.5 mAh g at 0.1C between 2 and 4.1 V, a capacity retention ratio exceeding 69.6% after 100 cycles at 0.2C, and a discharge capacity of 70.8 mAh g at a high rate of 5C, which is superior to that of O3-NaFeMnO. The codoping of Cu/Zr reserves the layered O3 structure and enlarges the interlayer spacing, promoting the diffusion of Na. In addition, the structural stability and air stability observed by Cu-doping is well maintained the incorporation of extra Zr favoring a highly reversible phase conversion process. Thus, this work has demonstrated an efficient strategy for developing cobalt/nickel-free high-capacity and air-stable cathodes for sodium-ion batteries.
考虑到地壳中铁和锰的丰富储量，阴极O3-NaFeMnO在大规模储能方面显示出巨大潜力。遵循引入特定杂元素以优化储能结构稳定性的策略，该研究获得了一种O3型NaFeMnCuZrO，其展现出增强的电化学性能和空气稳定性。在2至4.1 V之间，0.1C时其初始可逆容量为147.5 mAh/g，0.2C下100次循环后容量保持率超过69.6%，在5C高倍率下放电容量为70.8 mAh/g，优于O3-NaFeMnO。Cu/Zr的共掺杂保留了层状O3结构并扩大了层间距，促进了Na的扩散。此外，通过Cu掺杂观察到的结构稳定性和空气稳定性在掺入额外的Zr后得以良好保持，有利于高度可逆的相变过程。因此，这项工作展示了一种开发用于钠离子电池的无钴/镍高容量且空气稳定的阴极的有效策略。
