4results about How to "High Sulfur Utilization Efficiency" patented technology

The invention relates to the technical field of new energy materials and devices, and discloses a lithium-sulfur battery difunctional diaphragm and a preparation method thereof, the lithium-sulfur battery difunctional diaphragm comprises a diaphragm substrate and a load slurry, the load slurry is coated on the surface of the diaphragm substrate; the loaded slurry comprises an electrocatalyst material, and the electrocatalyst material is a monatomic catalyst carbon-based material / diatomic catalyst carbon-based material. The monatomic catalyst carbon-based material is a nickel monatomic catalyst carbon-based material or a cobalt monatomic catalyst carbon-based material; the diatomic catalyst carbon-based material is a nickel-cobalt diatomic catalyst carbon-based material. The nickel-cobalt diatomic catalyst coupled carbon-based material is applied to the field of lithium-sulfur batteries and serves as a lithium-sulfur battery diaphragm modification material, sulfur redox kinetics can be promoted, the shuttle effect can be inhibited, lithium ion flux can be induced, so that lithium dendrite growth is inhibited, and finally the cycle performance of the lithium-sulfur batteries is improved.

This invention relates to the field of battery separator materials technology, specifically to MXene-functionalized aramid paper-based battery separators, their preparation methods, and applications. Meta-aramid paper is prepared by wet papermaking using short-cut meta-aramid fibers and precipitated fibers. MXene nanosheets are prepared by hydrofluoric acid etching. Using the meta-aramid paper as a substrate, a functional coating is constructed on the surface of the aramid paper by loading a mixture of para-aramid nanofibers and MXene through a vacuum-assisted filtration-layer-by-layer self-assembly method. The resulting functionalized separator is obtained through protonation reduction. The separator, with its three-dimensional porous protective layer constructed from para-aramid nanofibers and MXene, combines physical barrier and chemical bonding, effectively inhibiting polysulfide shuttle. Furthermore, the highly active sites of MXene can activate inert sulfur-containing substances, improving sulfur utilization. When used in assembling lithium-sulfur batteries, the separator achieves an initial discharge capacity of 1244 mAh·g at a constant current density. ‑1 The capacity retention rate is 82% after 200 cycles.

The invention provides an ultrasonic cavitation device and a lithium-sulfur battery electrolyte entropy assisting method thereof, and belongs to the technical field of lithium-sulfur batteries. The device comprises a cabinet body, a cabinet door, an ultrasonic mechanism and a heat exchange mechanism, the cabinet door is connected with the cabinet body; the ultrasonic mechanism is arranged in the cabinet body; the heat exchange mechanism is connected with the ultrasonic mechanism; wherein the ultrasonic mechanism comprises an amplitude-change pole, an ultrasonic transducer, a cooling pond and a battery clamping device; the cooling pool is of a double-layer structure, the inner layer is an oil bath pool, and the outer layer is a water bath pool; the amplitude-change pole penetrates through the cabinet body and is in contact connection with the ultrasonic transducer; the upper end of the ultrasonic transducer is fixed on the cabinet body, and the lower end of the ultrasonic transducer is arranged in the oil bath and connected with the battery clamping device. The invention also provides a method for assisting the entropy of the electrolyte of the lithium-sulfur battery by using the ultrasonic cavitation device. The ultrasonic cavitation device is used for assisting entropy of the electrolyte of the lithium-sulfur battery, so that the relative mass transfer of liquid in the lithium-sulfur battery can be enhanced, the oxidation-reduction reaction process is promoted, the sulfur utilization rate is increased, and the application prospect is wide.

The invention provides a preparation method and application of a lithium-sulfur battery positive electrode with a composite solid-phase conversion mechanism, and belongs to the technical field of preparation of lithium-sulfur battery positive electrodes. Molybdenum salt, nickel salt and thiourea are mixed to form a precursor solution, carbon nanofibers are subjected to hydrothermal treatment to obtain a precursor, and the precursor is calcined to obtain the positive electrode material. Mixing the material with sulfur powder to melt sulfur, mixing with a conductive agent and PVDF (Polyvinylidene Fluoride) to prepare slurry, and coating and drying the slurry on a current collector; after the positive electrode is assembled into a battery, a stable SEI film is formed through initial circulation, the lithium-sulfur battery positive electrode with a composite solid-phase conversion mechanism is obtained, sulfur is sealed in a honeycomb-shaped micropore nanometer chamber by the positive electrode, and a low-impedance and firm SEI film can be generated by a catalytic component in the positive electrode and an electrolyte; the synergistic effect of the two avoids the generation and dissolution of a polysulfide intermediate product, so that the cycle life of the battery is remarkably prolonged under the conditions of high sulfur content and low E / S.