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<p>In LiNiMnCo cathodes, Co, as an expensive metal, is limited in terms of resources and not environmentally friendly, it is always important to try to reduce or replace it with another element. Compared to Co, Fe is abundant, environmentally friendly and cheap, and can improve the safety and stability of batteries. This research examines LiMn<sub>0.6</sub>Ni<sub>0.2</sub>Co<sub>0.2</sub>O<sub>2</sub> (MNC622) and LiMn<sub>0.6</sub>Ni<sub>0.2</sub>Co<sub>0.1</sub>Fe<sub>0.1</sub>O<sub>2</sub> (MNCF6211) as cathodes in Li-ion batteries which was synthesized by sol-gel technique and we investigated the importance of reducing Co with Fe. The X-ray diffraction (XRD) showed that the hexagonal structure indicated the presence of the LiMO<sub>2</sub> (M = Mn, Ni, Co) phase (α- NaFeO<sub>2</sub> type), and the main peaks at about 2<i>Ɵ</i>~ 18 ˚, in the (003) orientation. FESEM images showed regular hexagonal morphology, and the average grain size decreased in MNCF6211. UV-Vis indicated increased absorbance in sample MNCF6211. FTIR analysis confirmed that the desired structures were successfully formed. The cyclic voltammetry results are consistent with the redox reactions performed. The galvanostatic charge/ discharge test also revealed the initial discharge-specific capacity value of 119 mAh g<sup>− 1</sup> and 112 mAh g<sup>− 1</sup> after 500 cycles for LiMn<sub>0.6</sub>Ni<sub>0.2</sub>Co<sub>0.2</sub>O<sub>2</sub> and LiMn<sub>0.6</sub>Ni<sub>0.2</sub>Co<sub>0.1</sub>Fe<sub>0.1</sub>O<sub>2</sub>, respectively. These findings suggest that the LiMn<sub>0.6</sub>Ni<sub>0.2</sub>Co<sub>0.2</sub>O<sub>2</sub> and LiMn<sub>0.6</sub>Ni<sub>0.2</sub>Co<sub>0.1</sub>Fe<sub>0.1</sub>O<sub>2</sub> samples perform well in Li-ion batteries.</p>

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Synthesis and Characterization of LiMn0.6Ni0.2Co(0.2−x)FexO2 (x = 0, 0.1) as Cathodes in Li-ion Batteries

  • 期刊论文

  • 发表日期：

    2025年4月16日

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  • Mahsa Sadat Sarmalek,
  • Mehdi Adelifard,
  • Seyed Ahmad Nabavi Amri

摘要

In LiNiMnCo cathodes, Co, as an expensive metal, is limited in terms of resources and not environmentally friendly, it is always important to try to reduce or replace it with another element. Compared to Co, Fe is abundant, environmentally friendly and cheap, and can improve the safety and stability of batteries. This research examines LiMn0.6Ni0.2Co0.2O2 (MNC622) and LiMn0.6Ni0.2Co0.1Fe0.1O2 (MNCF6211) as cathodes in Li-ion batteries which was synthesized by sol-gel technique and we investigated the importance of reducing Co with Fe. The X-ray diffraction (XRD) showed that the hexagonal structure indicated the presence of the LiMO2 (M = Mn, Ni, Co) phase (α- NaFeO2 type), and the main peaks at about 2Ɵ~ 18 ˚, in the (003) orientation. FESEM images showed regular hexagonal morphology, and the average grain size decreased in MNCF6211. UV-Vis indicated increased absorbance in sample MNCF6211. FTIR analysis confirmed that the desired structures were successfully formed. The cyclic voltammetry results are consistent with the redox reactions performed. The galvanostatic charge/ discharge test also revealed the initial discharge-specific capacity value of 119 mAh g− 1 and 112 mAh g− 1 after 500 cycles for LiMn0.6Ni0.2Co0.2O2 and LiMn0.6Ni0.2Co0.1Fe0.1O2, respectively. These findings suggest that the LiMn0.6Ni0.2Co0.2O2 and LiMn0.6Ni0.2Co0.1Fe0.1O2 samples perform well in Li-ion batteries.