Self-supporting Co3O4/Graphene Hybrid Films as Binder-free Anode Materials for Lithium Ion Batteries

Abstract

A self-supporting Co3O4/graphene hybrid film has been constructed via vacuum filtration of Co(OH)2 nanosheet and graphene, followed by a two-step thermal treatment. Within the hybrid film, Co3O4 nanoparticles with size of 40~60 nm uniformly in-situ grew on the surface of graphene, forming a novel porous and interleaved structure with strong interactions between Co3O4 nanoparticles and graphene. Such fascinating microstructures can greatly facilitate interfacial electron transportation and accommodate the volume changes upon Li ions insertion and extraction. Consequently, the binder-less hybrid film demonstrated extremely high reversible capacity (1287.7 mAh g−1 at 0.2 A g−1), excellent cycling stability and rate capability (1110 and 800 mAh g−1 at 0.5 and 1.0 A g−1, respectively).

Synthesis of cobalt aluminate spinel by sol-gel process: Investigation of starting reagents and precursors obtained after pyrolysis

“…4 shows the FTIR spectra of the powders obtained after the calcination of cobalt nitrate at 300 ° C, 500 °C, 900 °C and 1100 °C. For all of the analysed powders, two absorption bands are observed at 662 and 572 cm 1 , corresponding to the stretching vibrations of the metal-oxygen bond; this result confirmed the spinel structure of Co3O4 [25][26][27]. Notably, it is extremely difficult to differentiate between the FTIR spectra of pure Co3O4 and of Co3O4 with CoO impurities [28].…”

Recent Advances in Growth and Modification of Graphene‐Based Energy Materials: From Chemical Vapor Deposition to Reduction of Graphene Oxide

“…The rGO composites are the most potential anodes in LIBs because of high lithium storage capacity and simple preparation process. Hence, plenty of rGO composites are fabricated, including Si, SnO 2 , TiO 2 , Co 3 O 4 , Fe 2 O 3 , and others. In all rGO composites, the structure of rGO composites plays a critical role for improving device performances, and the common structures are shown in Figure .…”

POM-Based MOF-Derived Co3O4/CoMoO4 Nanohybrids as Anodes for High-Performance Lithium-Ion Batteries

“… 11 , 12 Therefore, many studies have been conducted to improve the cycling and rate performance of Co 3 O 4 or CoMoO 4 by structure control and regulation like microsize particles, 13 , 14 hollow nanospheres, 15 , 16 porous nanowires, 17 , 18 and composites of carbon/graphene. 19 , 20 However, both Co 3 O 4 and CoMoO 4 suffer from huge volume expansions during the charge/discharge process. Fortunately, it has been proved that the synergistic effect exists between Co 3 O 4 and CoMoO 4 , 21 − 23 which can promote the performances of the anodes for LIBs.…”