Citation: Congcong Zhang, Yinan Liu, Pengrui Bao, Yun Zheng, Yingying Shen, Yike Huang, Pingshan Jia, Zhiyuan Zhang, Kunye Yan, Rong Chen, Yuhao Li, Junpo Guo, Huaiyu Shao. Synergy enhancement mechanism of fluorine-doping and oxygen-defect for high-capacity F/O-CoO anode material[J]. Chinese Chemical Letters, ;2026, 37(8): 111212. doi: 10.1016/j.cclet.2025.111212 shu

Synergy enhancement mechanism of fluorine-doping and oxygen-defect for high-capacity F/O-CoO anode material

Congcong Zhang ^{a, 1} ,
Yinan Liu ^{a, 1} ,
Pengrui Bao ^b ,
Yun Zheng ^a ,
Yingying Shen ^a ,
Yike Huang ^a ,
Pingshan Jia ^a ,
Zhiyuan Zhang ^a ,
Kunye Yan ^a ,
Rong Chen ^a ,
Yuhao Li ^b ,
Junpo Guo ^{b, *,} ,
Huaiyu Shao ^{a, *,}

a.
Institute of Applied Physics and Materials Engineering, University of Macau, Macau SAR 999078, China
b.
Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China

hshao@um.edu.mo

guojunpo@htu.edu.cn

Received Date: 12 February 2025
Revised Date: 9 April 2025
Accepted Date: 15 April 2025
Available Online: 15 April 2025

Figures(5)

Transition metal oxides are regarded as promising alternatives to graphite anode material due to their high theoretical capacities. However, their low conductivity, large volume change and fragile structure during battery operation hamper large-scale applications. Herein, we synthesize F-doping and oxygen defect CoO composite (F/O-CoO) through a facile hydrothermal and following annealing process. Benefiting from the synergy of F-doping and oxygen defect, the F/O-CoO anode material delivers a high reversible capacity of 1112 mAh/g at 0.5 C and capacity retention of 609 mAh/g (79.1%) at 2 C after 400 cycles, as well as a rate capacity of 449 mAh/g at 5 C. This superior capacity enhancement is attributed to the enrichment of oxygen defect and necessary substitution of lattice oxygen atom by F, which play an important role in improving electrical conductivity and thus reducing polarization. DFT calculation provides a further explanation that F doping can reduce the Li⁺ adsorption energy and the bandgap energy of F/O-CoO material, as well as increase Li⁺ storage sites and Li⁺/e^- conductivity.
- F/O-CoO,
- Anode material,
- Capacity enhancement,
- Li⁺/e⁻ conductivity,
- Polarization,
- Bandgap energy
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