4results about "Boron/borides" patented technology

To provide a method and an apparatus that enable rehydrogenation after hydrogen release of borohydride composed of (HB)n(n≥4) as a hydrogen storage material so that the borohydride can be used repeatedly and the rehydrogenation can be performed without using a heating process.SOLUTION: A method for using a hydrogen storage material includes a rehydrogenation step of placing a hydrogen desorbed boron given by hydrogen being desorbed from borohydride composed of (HB)n(n≥4) under pressurized hydrogen of 4 MPa or more, whereby hydrogen is recombined with the hydrogen desorbed boron to form the borohydride. The rehydrogenation can be carried out without using a heating process. An exemplary embodiment of the hydrogen storage material is a hydrogen storage material supported on a bendable resin carrier.SELECTED DRAWING: Figure 2

The application belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ion battery composite positive electrode material and a preparation method thereof. The preparation method comprises the following steps: dissolving soluble nickel salt, iron salt and manganese salt in an ammonia water solution, adjusting pH to 11-12, heating and reacting under a nitrogen atmosphere, and obtaining an oxide precursor after filtration, washing and drying; adding sodium carbonate, the oxide precursor, modified silicon hexaboride and niobium sulfoselenide into ethanol, ball-milling and mixing, drying, calcining and cooling to obtain the sodium ion battery composite positive electrode material. The sodium ion battery composite positive electrode material prepared by the application has high specific capacity, good rate performance and excellent cycle stability.

The application belongs to the technical field of lithium purification, and relates to a method for comprehensive development and utilization of magnesium sulfate sub-type salt lake resources, which comprises the following steps: adjusting the SO4 2‑ concentration and the molar ratio of Mg 2+ , SO4 2‑ in the composition of brine to be treated to preferentially precipitate K + and realize concentration and enrichment of lithium and boron elements in the salt lake brine. The application can make the brine directly precipitate potassium salt during concentration by controlling the SO4 2‑ concentration and the molar ratio of Mg 2+ , SO4 2‑ , realize separation of potassium element from the brine, and avoid precipitation of lithium element in the form of lithium sulfate by controlling the SO4 2‑ concentration in the composition of the salt lake brine, thereby improving the purity of potassium salt and the subsequent lithium element yield, solving the problem of loss of lithium in the form of lithium sulfate precipitate when the brine with a molar ratio of Mg 2+ , SO4 2‑ <4 is collected in the prior art, and the process does not need to remove magnesium, so that the loss of boron element is small, and effective recovery of boron element is realized.