Micro‐Mesopores Nitrogen‐Doped Carbon Combined Polar‐MoS₂ as Host for High‐Performance Li‐S Batteries

Abstract

A composite of MoS2/MMNC (micro‐mesopores nitrogen‐doped carbon) was prepared through a simple hydrothermal method and utilized as a host for Li−S battery. The crystal structure of MoS2/MMNC−S composite were tested by X‐ray diffraction (XRD), Raman Spectroscopy and X‐ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize its morphology. The pore size distribution and weight ratio of sulfur were measured via N2 adsorption‐desorption isotherm and thermogravimetric analysis (TGA), respectively. MoS2/MMNC−S composite showed a good electrochemical performance as the positive electrode for Li−S battery. The rate performance of the battery is ideal and the capacity retention is maintained at ∼ 90% after 200 cycles at 0.5 C.

Rational design of hollow flower-like MoS2/Mo2C heterostructures in N-doped carbon substrate for synergistically accelerating adsorption-electrocatalysis of polysulfides in lithium sulfur batteries

“…The TEM In order to explain the problem of electron transfer rate, EIS test was carried out in this experiment. Figure 4(f) depicts EIS curves, the high-frequency area is a semi-arc signify charge transfer resistance (R ct ), controlled by electrode reaction dynamics, while the low-frequency area is a slash signify lithium diffusion impedance (Z w ), owned by the diffusion of the reactant or product [40][41][42][43]. The H-Mo 2 S/Mo 2 C/NC/S NFs electrode exhibits the lowest impedance values and revealed the excellent interface solid-liquid-solid conversion reaction, which attributed to the synergistic effects of the heterostructure, build-in electric field promote fast electron transfer, and reaction kinetics within the electrode.…”

Preparation of an N–S dual-doped black fungus porous carbon matrix and its application in high-performance Li–S batteries

“…An Li–S battery refers to a type of a battery system that uses sulfur (or sulfur compounds) as the positive electrode and lithium or lithium-storage materials as the negative electrode ( Fu et al, 2023 ; Yu et al, 2023 ). Compared with traditional Li-ion batteries, Li–S batteries possess higher theoretical specific capacity (1,675 mAh g -1 ) and higher theoretical energy density (2,600 Wh kg -1 ), making them the most promising secondary batteries for next-generation commercial applications ( Zhao et al, 2020 ; Rayappan et al, 2023 ).…”

“…This is because heteroatom doping can increase the force between the oxygen-containing functional group and the sulfur atom in the carbon material, which can prevent the dissolution of lithium polysulfide in the electrolyte so as to inhibit the shuttle effect ( Dai et al, 2023 ; Hu et al, 2023 ; Jiang et al, 2023 ). The experimental results indicate that doping with nitrogen and phosphorus can improve the polarity of electrode materials, enhance the binding force between porous carbon matrix and elemental sulfur, and alleviate the shuttle effect ( Zhao et al, 2019 ; Zhao et al, 2020 ).…”