Mild-method synthesised rGO–TiO2 as an effective Polysulphide–Barrier for Lithium–Sulphur batteries

Lightweight Free-Standing 3D Nitrogen-Doped Graphene/TiN Aerogels with Ultrahigh Sulfur Loading for High Energy Density Li–S Batteries

“…Figure a shows the change process of the crystal phase from the raw material (GO) to the final product (3DNG–TiN) during the synthesis process. The peak at 10.7° was the characteristic peak of GO . With the hydrolysis of TBOT, the signal of TiO 2 can be found in the XRD pattern, indicating the formation of TiO 2 particles on the GO matrix.…”

“…The peak at 10.7°was the characteristic peak of GO. 37 With the hydrolysis of TBOT, the signal of TiO 2 can be found in the XRD pattern, indicating the formation of TiO 2 particles on the GO matrix. In the XRD pattern of 3DG-TiO 2 (Figure 2a) and 3DG (Figure S7a), the broad diffraction peak located at 20−25°should be ascribed to partially reduced GO by sodium ascorbate during the selfassembly process.…”

“…X-ray photoelectron spectroscopy (XPS) was used to characterize the elemental chemical states in different materials. The C 1s XPS spectra (Figure b) of GO and GO-TiO 2 samples can be divided into four peaks at 284.8, 285.9, 287.8, and 289.5 eV, corresponding to the chemical states of C–C, C–O, CO, and O–CO, respectively, ,, while in the 3DG-TiO 2 sample only C–C and C–O singles were observed, and in 3DNG–TiN sample, C–C, C–O, and C–N signals were present. It can be found (Table S1) that the proportions of C–C bonds in the total carbon for the GO (13.2%) and GO-TiO 2 sample (10.9%) kept nearly constant, while this value for the 3DG-TiO 2 sample increased sharply to 60.6% due to the reduction effect by the addition of l -ascorbic acid sodium salt as confirmed by the XRD results (Figure a).…”

A hierarchically porous TiO2@C membrane with oxygen vacancies: a novel platform for enhancing the catalytic conversion of polysulfides

“…5c). 35,36 In particular, the characteristic Ti-S bond peak gives evidence that the TiO 2−x @C membrane undergoes close interactions with polysulfides and has strong adsorption effects towards polysulfides. Thus, the TiO 2−x @C membrane has good effects relating to the inhibition of the shuttling of polysulfides in Li-S batteries.…”

Enhancing Adsorption and Reaction Kinetics of Polysulfides Using CoP-Coated N-Doped Mesoporous Carbon for High-Energy-Density Lithium–Sulfur Batteries

“…These materials can effectively improve the conductivity of sulfur cathodes, and provide a large specific surface area to anchor polysulfides. , Moreover, they also improve the structural stability of the cathode by leaving space for the volume expansion of sulfur. − However, the weak physical interaction between the nonpolar carbon materials and polysulfides makes it difficult to inhibit the shuttle of soluble polysulfides effectively . For this reason, some polar metal compounds, such as metal oxides, metal sulfides, , metal nitrides, metal carbides, and their composites with carbon, , have been employed as sulfur host materials to improve the interaction with polysulfides. Additionally, accelerating the reaction kinetics of polysulfides in the redox process is another important aspect to realize the high-performance potential of Li–S batteries.…”