Abstract
With lithium-ion (li-ion) batteries as energy storage devices, operational safety from thermal runaway remains a major obstacle especially for applications in harsh environments such as in the oil industry. In this approach, a facile method via microwave irradiation technique (MWI) was followed to prepare Co3O4/reduced graphene oxide (RGO)/hexagonal boron nitride (h-BN) nanocomposites as anodes for high temperature li-ion batteries. Results showed that the addition of h-BN not only enhanced the thermal stability of Co3O4/RGO nanocomposites but also enhanced the specific surface area. Co3O4/RGO/h-BN nanocomposites displayed the highest specific surface area of 191 m2/g evidencing the synergistic effects between RGO and h-BN. Moreover, Co3O4/RGO/h-BN also displayed the highest specific capacity with stable reversibility on the high performance after 100 cycles and lower internal resistance. Interestingly, this novel nanocomposite exhibits outstanding high temperature performances with excellent cycling stability (100% capacity retention) and a decreased internal resistance at 150 °C.
Highlights
With lithium-ion batteries as energy storage devices, operational safety from thermal runaway remains a major obstacle especially for applications in harsh environments such as in the oil industry
It should be noted that for the X-ray diffraction (XRD) graphs of Co3O4/reduced graphene oxide (RGO), Co3O4/hexagonal boron nitride (h-Boron Nitride (BN)), and Co3O4/ RGO/h-BN, the 111 plane matches the XRD of pure Co3O4 with normal cubic spinel structure. This could be due www.nature.com/scientificreports to the sufficient amount of hydroxyl anions in the solution during the preparation of Co3O4/RGO, Co3O4/h-BN, and Co3O4/RGO/h-BN as a lower concentration of cobalt acetate was used with the same amount of H2O used in Co3O4 synthesis[28]
It was observed that Co3O4/RGO have larger sizes of Co3O4 nanoparticles when compared to pure Co3O4 and Co3O4/h-BN this might be due to oxygen groups from RGO interact with Co3O4 and resulted in larger Co3O4 size, whereas the addition of RGO/h-BN reduced the size of Co3O4 nanoparticles
Summary
With lithium-ion (li-ion) batteries as energy storage devices, operational safety from thermal runaway remains a major obstacle especially for applications in harsh environments such as in the oil industry. In this approach, a facile method via microwave irradiation technique (MWI) was followed to prepare Co3O4/reduced graphene oxide (RGO)/hexagonal boron nitride (h-BN) nanocomposites as anodes for high temperature li-ion batteries. Compromising between the electrochemical performances and thermal stability is a challenge To overcome this issue, highly thermal stable two-dimensional (2D) materials that are based on hexagonal boron nitride (h-BN) can be very promising. H-BN is stable and inert against many chemicals including lithium[10]
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