Graphene-Embedded Co₃O₄ Rose-Spheres for Enhanced Performance in Lithium Ion Batteries

Abstract

CoO has been widely studied as a promising candidate as an anode material for lithium ion batteries. However, the huge volume change and structural strain associated with the Li insertion and extraction process leads to the pulverization and deterioration of the electrode, resulting in a poor performance in lithium ion batteries. In this paper, CoO rose-spheres obtained via hydrothermal technique are successfully embedded in graphene through an electrostatic self-assembly process. Graphene-embedded CoO rose-spheres (G-CoO) show a high reversible capacity, a good cyclic performance, and an excellent rate capability, e.g., a stable capacity of 1110.8 mAh g at 90 mA g (0.1 C), and a reversible capacity of 462.3 mAh g at 1800 mA g (2 C), benefitted from the novel architecture of graphene-embedded CoO rose-spheres. This work has demonstrated a feasible strategy to improve the performance of CoO for lithium-ion battery application.

Core–Shell Nitrogen‐Doped Carbon Hollow Spheres/Co3O4 Nanosheets as Advanced Electrode for High‐Performance Supercapacitor

“…The typical peaks of Co, C, and O are shown in the Co 3 O 4 /NHCS survey spectrum (Figure S7, Supporting Information), while the N peak is not evident due to the coating of Co 3 O 4 nanosheets on the surface of NHCS. In the Co 2p high‐resolution XPS spectrum (Figure c), two major peaks at 780.6 and 796.1 eV correspond to the Co 2p 3/2 and Co 2p 1/2 spin–orbit peaks, respectively, with a spin energy separation of 15.5 eV; while a pair of shake‐up satellite peaks at 785.9 and 801.4 eV are characteristic of Co 3 O 4 phase . Besides, two pairs of fitting peaks are assigned to Co 3+ (779.8 and 795.2 eV) and Co 2+ (781.1 and 796.4 eV), respectively.…”

“…In the Co 2p high-resolution XPS spectrum (Figure 4c), two major peaks at 780.6 and 796.1 eV correspond to the Co 2p 3/2 and Co 2p 1/2 spin-orbit peaks, respectively, with a spin energy separation of 15.5 eV; while a pair of shake-up satellite peaks at 785.9 and 801.4 eV are characteristic of Co 3 O 4 phase. [52][53][54] Besides, two pairs of fitting peaks are assigned to Co 3+ (779.8 and 795.2 eV) and Co 2+ (781.1 and 796.4 eV), respectively. As shown in Figure 4d Figure 5c to evaluate their rate capability.…”

Cobalt Oxide Nanocubes Encapsulated in Graphene Aerogel as Integrated Anodes for Lithium‐Ion Batteries

“…Two peaks in the anode curve at 1.6 and 2.3 V were assigned to the oxidation of metallic Co to Li x Co 3 O 4 and the oxidation of Li x Co 3 O 4 to Co 3 O 4 , respectively . The intensity of cathode peak in the second cycle was significantly lower than that of the first cycle, indicating that the irreversible reaction occurred during the cycles because of the formation of SEI film, the decomposition of electrolyte, etc . The second and third CV cycles for Co 3 O 4 @GA were well coincided, demonstrating the high reversibility and cycle stability for the composite electrode.…”

Cobalt oxide nanosheets anchored onto nitrogen-doped carbon nanotubes as dual purpose electrodes for lithium-ion batteries and oxygen evolution reaction

“…As an alternative, Co 3 O 4 has been identified as an attractive anode material for OER catalysis, ascribed to its excellent catalytic properties, corrosion durability in alkaline solutions, as well as low cost and earth abundance . To achieve the exceptional OER performance, Co 3 O 4 has been fabricated into various nanostructures on conductive substrates (eg graphene, N‐doped graphene and carbon nanotubes, etc) with increased active sites and electronic conductivity . For example, a synergistic catalyst for OER between Co 3 O 4 and graphene in the Co 3 O 4 /N‐graphene hybrid was confirmed by Dai's group .…”