4results about "Boron halogen compounds" patented technology

This invention relates to a compound, potassium fluoroborate, a nonlinear optical crystal of potassium fluoroborate, its preparation method, and its uses. The chemical formula of the compound is K₂B₂OF₆, and its molecular weight is 229.82. It is prepared by a room temperature solution method or a hydrothermal method. The crystal belongs to the hexagonal crystal system, with space group P₆(_)₂m, and cell parameters a=9.1105(13)Å, b=9.1105(13)Å, c=6.9919(17)Å, α=90°, β=90°, γ=120°, Z=3, and V=502.59(16)Å. 3 Potassium fluoroborate nonlinear optical crystals obtained by growing crystals using room-temperature solution methods, hydrothermal methods, or high-temperature melt methods possess advantages such as a wide transmission band, stable physicochemical properties, moderate mechanical hardness, resistance to breakage, and ease of cutting, polishing, and storage. They can be widely used in nonlinear optical devices such as frequency doubling converters and optical parametric oscillators.

The present application relates to the field of comprehensive utilization of wet-process phosphoric acid resources and preparation of new energy materials, and discloses a method for selectively recovering fluorine from wet-process phosphoric acid and preparing lithium difluorophosphate. By adding boric acid to the wet-process phosphoric acid, the fluorine species is converted, and tri-octylamine organic extraction system is used to selectively separate fluorine and phosphorus, and then lithium fluoroborate is prepared by back extraction, and further reacts with anhydrous oxalic acid to generate lithium difluorophosphate, and after recrystallization, battery-grade lithium difluorophosphate with a purity of 99.7% or above is obtained. The method realizes efficient recovery and high-value conversion of by-product fluorine resources in wet-process phosphoric acid, has the advantages of simplified process, high extraction selectivity, high resource utilization rate and significantly improved product added value, and can be used for preparation of lithium ion battery electrolyte.

This invention discloses a lithium-rich ferric acid modified material, its preparation method, and its application. The lithium-rich ferric acid modified material comprises a lithium-rich ferric acid core and a coating layer; the coating layer covers at least a portion of the surface of the lithium-rich ferric acid core; the coating layer comprises lithium fluoride and lithium borate; the lithium-rich ferric acid core is doped with boron and fluorine. This invention constructs a lithium fluoride and lithium borate composite coating layer on the surface of a boron- and fluorine-doped lithium-rich ferric acid core. The resulting lithium-rich ferric acid modified material has the advantages of high charge / discharge specific capacity and good air stability, solving the problem of significant capacity reduction in lithium-rich ferric acid when exposed to air. This material can maintain a high specific capacity even after prolonged exposure to air, thus it can be used as a high-capacity lithium replenisher for lithium-ion batteries, achieving high lithium replenishment efficiency. Simultaneously, this material is prepared at low temperature, with short preparation time, simple process, low price, and is environmentally friendly.