41 results about "Bismuth fluoride" patented technology

The present invention relates to primary and secondary electrochemical energy storage systems, particularly to such systems as battery cells, which use materials that take up and release ions as a means of storing and supplying electrical energy. The present positive electrode composition comprises a nanocrystalline bismuth fluoride compound, which comprises Bi+3, and has a maximum energy density of 7170 Wh / l−1.

The invention provides a fluorination process of 1,3-dioxolame ester or 1,3-dioxane ester containing perfluorinated compounds. The process comprises the following steps of putting a first fluorinationsolvent and a catalyst into a reaction kettle, wherein the catalyst is selected from one or several of boron trifluoride, cobalt trifluoride, bismuth trifluoride and arsenic trifluoride; dissolving ahydrocarbon substrate and a surfactant in a second fluorination solvent to obtain a raw material solution, wherein the surfactant is selected from one or several of perfluorononanoic acid, perfluorooctane sulfonate and tetrabutylammonium fluoride, and the hydrocarbon substrate is of a structure of a formula (I) or a formula (II); performing fluorination reaction on the raw material liquid and fluorine gas in the reaction kettle to obtain the perfluorinated compounds. In the specific fluorine-containing solvent, the low-cost hydrocarbon compounds are used as starting raw materials; the specialfluorine-containing surfactants and catalysts are used as the assistance so that the fluorine gas and the raw materials are in direct contact to be converted into the perfluorinated compounds. The method is simple; the cost is low; meanwhile, the yield is high.

The invention relates to a solid phase synthetic Co<2+> doped bismuth fluoride lithium-ion battery positive electrode material and a preparation method thereof. According to the method, a quaternary ammonium salt adopting fluorine as anions is adopted as a raw material, the bismuth fluoride is subjected to direct solid-phase synthesis through the large group steric hindrance effect and through the effect of a specific auxiliary agent, and the electronic conductivity of the material is improved through the Co<2+> doping, wherein the bismuth fluoride material adopted as the lithium-ion battery positive electrode material has the specific capacity exceeding 200 mAh.g<-1>. According to the present invention, the method has characteristics of low equipment requirement and high product purity, the condition that a plurality of the double salts of the bismuth fluoride and other side reaction products are generated in the liquid phase reaction can be avoided, and the material has the excellent electrochemical property.

The invention provides an Al<3+> and Cu<2+> doped cubic-structure bismuth fluoride lithium ion battery positive electrode material based on solid phase synthesis and a preparation method thereof. According to the method, a quaternary ammonium salt utilizing fluorine as negative ions is adopted as a raw material so as to directly synthesize cubic-structure bismuth fluoride by virtue of a large-group steric hindrance effect and the effect of a specific accessory ingredient in a solid phase manner; furthermore, Cu<2+> is doped, so that the average discharge electric potential of the raw material is improved; Al<3+> is doped, so that the capacity circulation stability is improved; serving as a lithium ion battery positive electrode material, the bismuth fluoride material has a specific capacity greater than 200mAh.g<-1>. The method is low in equipment requirement and high in product purity, and can be used for avoiding the problem that byproducts such as multiple complex salts of bismuth fluoride are generated during solid-phase reaction; the product has excellent electrochemical performance.