3results about How to "Stable phase structure" patented technology

This invention belongs to the field of proton ceramic electrochemical battery technology, and discloses a cobalt-free air electrode material for a reversible proton conductor type ceramic electrochemical battery, its preparation, and its application. The air electrode material has PrBa 0.8‑x Ca 0.2 Fe 1.8 Ce 0.2‑y O 6‑δ The three-phase structure of BaCeO3 and CeO2 forms BaCeO3 and CeO2 nanoparticles attached to PrBa 0.8‑x Ca 0.2 Fe 1.8 Ce 0.2‑y O 6‑δ Heterogeneous structure on the surface of the skeleton; where 0

The application relates to a Nb4N5-MgH2 composite hydrogen storage material and a preparation method thereof. The composite hydrogen storage material comprises Nb4N5 and MgH2, and the Nb4N5 accounts for 3wt.%-9wt.% in the composite hydrogen storage material according to the mass percentage. The preparation method comprises the following steps: (1) preparing a Nb4N5 catalyst, dissolving NbCl5 in anhydrous ethanol, adding ammonia water to generate a precipitate, washing and drying, and then calcining in an ammonia atmosphere to obtain a Nb4N5 catalyst powder; (2) mixing the Nb4N5 catalyst with MgH2, and preparing a composite hydrogen storage material through mechanical ball milling. In the ball milling process, stainless steel balls are adopted, argon is used as a protective atmosphere, the ball-to-material ratio is (10-40):1, the ball milling time is 5-12 hours, the rotating speed is 350-500 rpm, and positive and negative intermittent ball milling is adopted. The composite material prepared by the application has excellent hydrogen storage kinetic performance. Through the uniform distribution of the Nb4N5 catalyst and the stable phase structure thereof, the hydrogen absorption and release performance and the cycle stability of the hydrogen storage material are remarkably improved. The application is suitable for the hydrogen energy field.

The invention relates to a method for preparing lithium sulfide through a sulfur-lithium salt reaction assisted by molten salt, and belongs to the technical field of lithium-sulfur batteries and solid electrolyte materials, and the method comprises the following steps: 1, carrying out mechanical crushing and screening treatment on a lithium salt; then putting the treated lithium salt and molten salt into a crucible, and uniformly mixing; 2, putting the crucible filled with the lithium salt and the molten salt in the step 1 into a reactor; 3, in an inert atmosphere or a reduced pressure atmosphere, sulfur is added into the reactor, so that the sulfur is molten under the action of the molten salt and permeates to the surface of the lithium salt, and the sulfur and the lithium salt react at an interface to generate lithium sulfide; and 4, cooling the system after the reaction to room temperature in an inert atmosphere or a reduced pressure atmosphere, taking out the product, and separating and recovering the residual fused salt to obtain lithium sulfide powder. The method is simple in process and environment-friendly, and the prepared lithium sulfide has the advantages of high purity, low defect, cubic phase and the like, and is suitable for industrial amplification.