Abstract
In this study, novel Carbon aerogel (CA)/Co3O4/Carbon (C) composites with a double protective structure are synthesized through a solvothermal method and in-situ polymerization. The morphology and structure are characterized by X-ray diffraction, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and Fourier transform infrared spectroscopy (FTIR). The loading content of active anode material Co3O4 in the composite is investigated by thermogravimetry, and the electrochemical properties of the composite are characterized by electrochemical impedance spectroscopy (EIS). The SEM results show that the nano-sized spherical Co3O4 particle is adhered to the inner Carbon aerogel (CA). The HRTEM result indicates the thickness of the prepared Carbon (C) up to 40 nm. Nano-sheet is coated on the surface of the Co3O4 particle. Compared with the pure Co3O4 anode materials, the Carbon aerogel (CA)/Co3O4/Carbon (C) composites have better transport kinetics for both electron and lithium-ion in EIS testing results, which may contribute to its higher specific capacity and higher first coulomb efficiency. Due to the unique structure of the composite material with double protection against the volume expansion of Co3O4 when charged, the Carbon aerogel (CA)/Co3O4/Carbon (C) composite material exhibits better cycle stability with a discharge capacity of 1180 mAh/g after 50 cycles. Therefore, the double protection strategy is verified as an effective method to improve the electrochemical performance of transition metal oxide with carbon composite as an anode material in lithium battery.
Highlights
Due to the relatively high energy density and outstanding electrochemical performance, the rechargeable Li-ion battery has become the mainstream power source in the electrical vehicle (EV), the electrical storage system (ESS), and consumer electronic products (CE) in recent years [1] [2] [3]
The loading content of active anode material Co3O4 in the composite is investigated by thermogravimetry, and the electrochemical properties of the composite are characterized by electrochemical impedance spectroscopy (EIS)
A standard method based on Carbon aerogel (CA)/Co3O4/Carbon (C) composite—Li half cell was used to evaluate the electric-chemical performance
Summary
Due to the relatively high energy density and outstanding electrochemical performance, the rechargeable Li-ion battery has become the mainstream power source in the electrical vehicle (EV), the electrical storage system (ESS), and consumer electronic products (CE) in recent years [1] [2] [3]. A lot of research has been devoted to the electrochemical active transition metal oxides (TMOs) as promising anode materials (SnO2 [4], TiO2 [5], ZnO [6], Fe3O4 [7] and α-Fe2O3 [8], Co3O4 [9]-[19]), due to their high theoretical capacities (>700 mAh/g) and abundance in nature. We have reported a composite material Carbon aerogel (CA)/Co3O4/Carbon (C), which consists of the macroporous architecture of three-dimensional carbon aerogel (CA) with the nano-sized spherical Co3O4 particle, and the nano-thickness carbon layer This structure is designed as a double protection structure, aiming to pro-. Compared with pure Co3O4 particles, this double protection Carbon Aerogel (CA)/Co3O4/Carbon (C) composites exhibit improved electrochemical performance, including the higher specific capacity, electrochemical kinetic and cycling stability
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