6 results about "Hexafluorobenzene" patented technology

Disclosed are an etching gas composition and a plasma etching method using same. The etching gas composition is supplied to an etching chamber so as to generate plasma, and comprises: a fluorocarbon gas containing hexafluorobenzene (C6F6); a reactive gas; and an inert gas.

The invention discloses a fluorine-containing diamine monomer, polyimide and a preparation method and application of the fluorine-containing diamine monomer, the fluorine-containing diamine monomer is generated by reacting phenol with amino and dialkyl with hexafluorobenzene, and the fluorine-containing diamine monomer and specific tetracarboxylic dianhydride with a non-rigid structure, including 4, 4 '-(hexafluoroisopropylidene) diphthalic anhydride, 4, 4'-oxydiphthalic anhydride, 9, 10-di-tert-butyl-4-methyl-1, 3, 4, 5-tetracarboxylic dianhydride, 9, 10-di-tert-butyl-4-methyl-1, 3, 5-tetracarboxylic dianhydride and 9, 10-di-tert-butyl-4-methyl-1, 3, 5-tetracarboxylic dianhydride. According to the present invention, the polyimide film with characteristics of good light transmission performance, good thermal performance and good mechanical strength can be prepared through the reaction of 2, 9-bis (trifluoromethyl) xanthene-2, 3, 6, 7-tetracid dianhydride and bisphenol A diether dianhydride, and has good application prospects in the fields of flexible display substrates, printed circuit boards, solar cell substrates, flexible packaging films and other optical films.

The invention relates to a lithium-ion electrochemical element comprising: a) a positive electrode comprising a lithium phosphate of at least one transition metal operating at a potential greater than or equal to 3.6 V vs. Li+ / Li; b) a negative electrode; c) an electrolyte comprising: - one or more solvents, one being methyl propionate, - one or more diluents selected from a fluorinated alkyl ether, fluorobenzene, 1,2-difluorobenzene and isomers thereof, 1,2,3-trifluorobenzene and isomers thereof, 1,2,3,4-tetrafluorobenzene and isomers thereof, pentafluorobenzene, hexafluorobenzene, 2-fluorotoluene and isomers thereof and a mixture thereof, the volume proportion of the one or more diluents representing from 50 to 80% of the total volume of the one or more solvents and the one or more diluents, - lithium bis(fluorosulfonyl)imide, - a negative-electrode passivation additive selected from ethylene monofluorocarbonate and / or vinylene carbonate.

This application provides an electrolyte for lithium-ion batteries and a lithium-ion battery using the same. The electrolyte comprises a first additive and an organic solvent. The first additive has a mass fraction of 1.6–4.5% in the electrolyte, and the organic solvent has a mass fraction of 80–85%. The first additive includes fluorinated ether compounds, hexafluorobenzene, and vinylene carbonate, and the organic solvent includes ethylene glycol dimethyl ether. The mass ratio of the fluorinated ether compounds, hexafluorobenzene, and vinylene carbonate is 0.1–1:1–2:0.5–1.5. The electrolyte provided by this application can weaken the heat generated by oxygen release from high-nickel ternary cathode materials and suppress the heat generated by decomposition side reactions of the electrolyte, effectively suppressing the thermal runaway reaction of lithium-ion batteries, increasing their self-heating initiation temperature and thermal runaway initiation temperature, reducing the probability of thermal runaway in lithium-ion batteries containing high-nickel ternary cathode materials, and improving the safety performance of lithium-ion batteries.

The invention relates to a hexafluorobenzene microemulsion fire extinguishing agent and a preparation method thereof. The hexafluorobenzene microemulsion fire extinguishing agent comprises an anionic surfactant, hexafluorobenzene and water, and the mass ratio of the anionic surfactant to the hexafluorobenzene to the water is (9-20): (1-10): (70-90). The preparation method comprises the following steps: weighing the anionic surfactant, preparing the anionic surfactant into an aqueous solution, then adding hexafluorobenzene, and then storing the obtained hexafluorobenzene microemulsion in a liquid storage tank for 10-30 hours to obtain the hexafluorobenzene microemulsion fire extinguishing agent. The hexafluorobenzene microemulsion fire extinguishing agent provided by the invention is suitable for rapid fire extinguishing and cooling after the thermal runaway of the lithium ion battery, reduces the re-combustion probability of the lithium ion battery, and effectively inhibits the thermal spread after the thermal runaway of the lithium ion battery.

The application discloses a synthesis method of hexafluorobenzene and belongs to the fine chemical field. The method is carried out according to the following process: 1) mixing pentafluorobenzene, a catalyst and an initiator to obtain a mixed solution; 2) heating a pretreated reaction device, and then feeding specific mixed gas into the device from bottom to top; then feeding the mixed solution obtained in the step 1) into the reaction device from top to bottom; 3) collecting all the crude products obtained in the step 2), and then performing rectification to obtain hexafluorobenzene. The method has the advantages of mild reaction condition, easy industrialization, low raw material cost, high product yield and purity, and energy saving and environmental protection compared with other methods.