Co3O4 anchored on ionic liquid modified PAN as anode materials for flexible lithium-ion batteries

[Display omitted] •The three-dimensional (3D) island bridge structure (IBS) Co3O4 anchored into IL [BMIm][N(CN)2] modified PAN (Co3O4-PAN-IL) composite contains a large number of micropores and mesopores.It has been widely recognized that the creation of the interpenetrating micropores and mesopores...

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Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2022-03, Vol.908, p.116105, Article 116105
Main Authors: Cong, Longda, Zhu, Hengyao, Zhang, Shichao, Xing, Yalan, Xia, Jun, Meng, Xiaoxia, Yang, Puheng
Format: Article
Language:English
Subjects:
Anode materials
Anodes
Bridges
Cobalt oxide
Cobalt oxides
Doping
Electrochemical analysis
Electrode materials
Electrodes
Electron transfer
Electrostatic spinning
Ionic liquids
Ions
Lithium-ion batteries
Microspheres
Nitrogen
Rechargeable batteries
Synergistic effect
Transition metal oxides
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Summary:[Display omitted] •The three-dimensional (3D) island bridge structure (IBS) Co3O4 anchored into IL [BMIm][N(CN)2] modified PAN (Co3O4-PAN-IL) composite contains a large number of micropores and mesopores.It has been widely recognized that the creation of the interpenetrating micropores and mesopores and construction of hierarchical pores are an effective way to facilitate ion transfer channels through reduction of the electron and ion transportation path and transmission impedance.•IL modified PAN has been considered as a highly conductive N-doping matrix after annealing. The outstanding performance originated from the significant charge transfer from N-doping matrix to Co3O4 nanospheres promoting the inherent electrical conductivity of Co3O4.•Co3O4-PAN-IL electrode delivers high reversible capacity of 1499 mAh g−1, superior high-rate capability of 890 mAh g−1 at 2C rate and a capacity retention of 82.7% even after 800 cycles at 0.5C rate, which corresponds to 0.022% capacity loss per cycle.•This work brings up new opportunities to be a promising candidate for high performance durable LIBs. The concept to have significant repercussions on the design and development of high energy density electrochemical energy-storage devices for future widespread applications. Transition metal oxide Co3O4 is a candidate anode material for lithium-ion batteries (LIBs) due to its high theoretical specific capacity and easy preparation. However, unmodified Co3O4 suffers from distinctly inferior rate capability and poor cycling stability. Here, we design and fabricate a three-dimensional (3D) island bridge structure (IBS) Co3O4 anchored into IL [BMIm][N(CN)2] modified PAN (Co3O4-PAN-IL) composite. The Co3O4 is uniformly dispersed microspheres, and IL modified PAN constitute a conductive network, which together form an IBS. The structure can effectively promote electron transfer, improve the specific surface area of the material, and alleviate the volume effect of cobalt oxide. More importantly, IL modified PAN has been considered as a highly conductive N-doping matrix after annealing. By virtue of these merits, the Co3O4-PAN-IL electrode demonstrates a high reversible capacity of 1499 mA h g−1 at 0.5C. After 800 cycles, the capacity of 1239 mA h g−1 was maintained, and the attenuation rate of each cycle was 0.022%. Compared with pure Co3O4, the electrochemical performance was significantly improved. The excellent electrochemical performance was due to the synergistic effect o
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2022.116105