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- Title
Ca/Cu 共掺杂的O3-NaFe<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub>钠离子电池正极材料的 电化学性能研究.
- Authors
黎 伦; 张尚尚; 李盛凯; 张海燕; 吴起白
- 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 mA·h/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 mA·h/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.
- Subjects
SODIUM ions; TRANSITION metal oxides; TRANSMISSION electron microscopes; X-ray photoelectron spectroscopy; JAHN-Teller effect; SCANNING electron microscopes
- Publication
Advances in New & Renewable Energy, 2023, Vol 11, Issue 2, p155
- ISSN
2095-560X
- Publication type
Article
- DOI
10.3969/j.issn.2095-560X.2023.02.008