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 discloses a bismuth fluoride lithium ion cell anode material prepared through liquid phase synthesis and having a B<3+> and La<3+> doped orthorhombic structure and a preparation method of the bismuth fluoride lithium ion cell anode material. According to the method, the orthorhombic-structure bismuth fluoride is prepared by taking a liquid phase reaction, designing the technological conditions and introducing a plurality of auxiliaries; the specific capacity and the electronic conductivity of the material are improved by doping B<3+> and La<3+>; when the bismuth fluoride material is used as the lithium ion cell anode material, the specific capacity of the bismuth fluoride material is higher than 200 mAh / g<-1>. The method is low in equipment requirement, high in product purity, capable of avoiding generation of multiple side reaction products, such as double salt, of bismuth fluoride in the liquid phase reaction, and excellent in electrochemical performance.

A dual-functional negative electrode for an all-vanadium redox flow battery, the dual-functional negative electrode is based on a carbon material, and its surface is modified with a Bi-containing electrocatalyst, and the Bi-containing electrocatalyst is Bi simple substance, Bi2O3, Bi halide or Bi One or more than two kinds of metal salts; Bi halides are bismuth fluoride, bismuth chloride, bismuth bromide or bismuth iodide; Bi metal salts are bismuth sulfate, bismuth nitrate, bismuth phosphate, bismuth formate or bismuth acetate . This electrode is suitable for the negative electrode of the all-vanadium redox flow battery, which can greatly improve the electrocatalytic activity and electrochemical reversibility of the electrode material for the V2+ / V3+ redox reaction, reduce the charge transfer resistance; it also has a high hydrogen evolution overpotential, It can inhibit the occurrence of hydrogen evolution reaction and prolong the working life of the battery.

The invention relates to a liquid-phase bismuth fluoride lithium ion battery positive electrode material and a preparation method thereof. The method is characterized in that bismuth fluoride is prepared through designing technologic conditions and introducing various assistants through a liquid phase reaction, and the bismuth fluoride material can be used as a lithium ion battery positive electrode material and has a specific capacity exceeding 200mAh.g<-1>. The method has the advantages of low requirements on a device, high product purity, and avoiding of generation of various double salts of bismuth fluoride, and other side reaction products in the liquid phase reaction.

a kind of Fe 2 o 3 |FeF 3‑2x o x Gradient-coated bismuth fluoride copper fluoride two-component composite lithium battery positive electrode material and its preparation method, the method uses polyquaternium salts of different structures as templates to prepare bismuth fluoride copper fluoride two-component composite positive electrode materials in the solid phase, according to FeF 3 It is easy to be gradually oxidized to Fe at higher temperature 2 o 3 The characteristics of bismuth fluoride and copper fluoride two-component composite cathode material are sequentially coated with FeF 3‑ 2x o x , 0<x<0.3, and Fe 2 o 3 layer to improve the surface electronic conductivity of the two-component bismuth fluoride copper fluoride composite cathode material and resist the harmful effect of the organic electrolyte on the surface of the material particles; thereby greatly improving the bismuth fluoride copper fluoride two-component composite cathode material Comprehensive electrochemical performance.

The invention discloses an electrochemistry preparation method of a nano flaky BiF3 film and application of the nanometer flaky bismuth fluoride film, and belongs to the fields of Bi-based film photocatalytic material research and development, a solar energy photocatalyst immobilization technology and an organic pollutant disposal technology. The problems that the existing film immobilization technology is complicated or higher in energy consumption are solved. A Bi plate is taken as an anode, graphite is taken as a cathode, and a mixed solution is taken as electrolyte; in the mixed solution,concentration of ammonium fluoride is 0.5%-1.5%, and the volume ratio of ethylene glycol to distilled water is different; under normal temperature and normal pressure, in-situ growth of the nano flakyBiF3 film is on the Bi plate and the preparation method is a simple, economical and feasible nano flaky Bi-based catalyst film immobilization technology. The nano flaky BiF3 film is applied to photocatalytic degradation of Rhodamine B, is environmentally friendly in process, simple in technology, easy to operate, high in repeatability and short in period.

The invention relates to a solid-phase synthesis bismuth fluoride lithium ion battery anode material with a Co<2+> and Cu<2+> doped structure and a preparation method of the solid-phase synthesis bismuth fluoride lithium ion battery anode material. The preparation method comprises the following steps: a quaternary ammonium salt taking fluoride as an anion is taken as a raw material, the raw material is in solid-phase synthesis into bismuth fluoride with an orthorhombic structure directly through steric hindrance of a macroradical and the action of a specific additive, and at the same time, the average discharge potential of the material is improved through Cu<2+> doping, and the electronic conductivity of the material is improved through Co<2+> doping, and the bismuth fluoride material is taken as a lithium ion battery anode material and has specific capacity exceeding 200 mAh.g<-1>. The preparation method is low in equipment requirement, the product is high in purity, reaction by-products such as various complex salts for producing bismuth fluoride in the solid-phase reaction can be avoided, and the solid-phase synthesis oxygen bearing bismuth fluoride anode material is excellent in electrochemical performance.

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.