91 results about "Tetraethylene glycol dimethyl ether" patented technology

Compositions and methods for doping silicon substrates by treating the substrate with a diluted dopant solution comprising tetraethylene glycol dimethyl ether (tetraglyme) and a dopant-containing material and subsequently diffusing the dopant into the surface by rapid thermal annealing. Diethyl-1-propylphosphonate and allylboronic acid pinacol ester are preferred dopant-containing materials, and are preferably included in the diluted dopant solution in an amount ranging from about 1% to about 20%, with a dopant amount of 4% or less being more preferred.

The invention discloses a lithium ion battery electrolyte solution, and relates to the technical field of manufacturing of lithium ion batteries; the lithium ion battery electrolyte solution comprisesa lithium salt, a solvent, vinylene carbonate, an additive A and an additive B; the additive A is an ether nitrile compound or an aromatic compound, and the additive B is an organic ammonium salt; the ether nitrile compound is one of tetraethylene glycol dimethyl ether, ethylene glycol monobutyl ether, butanedinitrile or 1,3,6-hexanetricarbonitrile, the aromatic compound is one of thiophene, N-methylpyrrole or o-terophenyl, and the organic ammonium salt is ammonium benzoate or methyl ammonium benzoate. Based on the conventional additives, the combined additive of ether nitrile, the aromatic compound and the organic ammonium salt is added, a low-impedance, thin and dense SEI film is formed, and the battery internal resistance, the rate performance and the low-temperature performance are improved.

The invention provides the use of tetraethylene glycol dimethyl ether for adsorbing nucleic acids to solid phases such as those with silica surfaces. To this end, the invention also provides compositions comprising TDE. Methods are disclosed and claimed to purify nucleic acids from samples, as well as kits useful for performing these methods. Particularly, the invention encompasses methods for the purification of nucleic acids with low molecular weight. The nucleic acids purified by a method of the invention are suited for assays aiming at the detection of a target nucleic acid.

The invention discloses an organic phase electrolyte and an application thereof in a negative electrode of a redox flow battery. The organic phase electrolyte consists of active materials, a supporting electrolyte and an organic solvent, wherein the active materials are diphenyl ketone and a derivative thereof, anthrone and a derivative thereof, or dibenzoyl methane and a derivative thereof; the supporting electrolyte is selected from tetraethylammonium hexafluorophosphate, tetraethylammonium tetrafluoroborate, tetrabutylammonium hexafluorophosphate or tetrabutylammonium tetrafluoroborate; and the organic solvent is selected from acetonitrile, tetrahydrofuran, propylene carbonate, ethylene carbonate, dimethyl sulfoxide, dimethylformamide, glycol dimethyl ether or ethylene glycol diethyl ether. The organic phase electrolyte disclosed by the invention has relatively low electrochemical potential and high electrochemical property; when the organic phase electrolyte is used as the negative electrode electrolyte of the redox flow battery for assembling an organic phase redox flow battery, relatively high open-circuit voltage can be realized, so that the energy density of the battery can be improved; and meanwhile, the capacity fading of the battery can be lowered, so that the cycle life of the battery can be prolonged.

The invention discloses a preparation method for hexafluoropropylene oxide homopolymers. Potassium fluoride is employed as a catalyst to trigger ring-opening polymerisation of hexafluoropropylene oxide, a saturated solution of tetraethylene glycol dimethyl ether and fluorine containing solvent of cesium fluoride is added in batches for multiple times, the reaction temperature is lowered gradually from 0 DEG to -40 DEG C, thus reaction activity of tail end groups of hexafluoropropylene oxide homopolymers is kept, hexafluoropropylene oxide monomers are added continuously on this basis, and through control of addition times of hexafluoropropylene oxide and the cesium fluoride solution, hexafluoropropylene oxide homopolymers with an average polymerization degree of 50 can be synthesized. Through control of addition of monomers, hexafluoropropylene oxide homopolymers with an average polymerization degree of 20-50 can be synthesized selectively, and different industrial production requirements are met.

The invention provides a novel ceramic-metal oxide-polymer composite material. A functionalized metal oxide nanolayer coating can be bonded between LICGCs and polymers/oligomers, which protects the LICGC from corrosion, has a low interfacial resistance to Li⁺ migration, and can be a SIC. Hybrid ceramic-polymer electrolytes were formed by engineering the interface between a LICGC and a polymer, polyethylene oxide (PEO), by sputter coating a 200 nm thick SiO₂ layer onto a lithium ion conducting glass ceramic (LICGC) and silanating the SiO₂ with a functionalized PEG in the presence of LiTFSI. A low interfacial resistance (R_interfacial) was measured, the same as that obtained for a SiO₂ interface soaked with liquid tetraglyme/LiTFSI. The pegylated SiO₂ interface (unlike the tetraglyme/LiTFSI interface) protected the LICGC from corrosion by Li⁰ metal. The (PEG-LiTFSI)-SiO₂-LICGC could be bonded with polyethylene oxide/LiTFSI. This procedure provides a general method to bond other LICGCs to PEO-based polymers, and to incorporate other functionalities such as single ion conductivity into the interface via the incorporation of coupling agents with pendant anions.

The invention belongs to reference electrolyte capable of improving the cycling performance of a lithium-sulfur battery and a preparation method. The reference electrolyte is prepared from an ether type solvent, lithium salt, lithium nitrate and an additive for improving the cycling performance, wherein the ether type solvent is a mixture of two solvents; a first solvent is any one of 1,3-dioxolane and 1,4-dioxane; a second solvent is any one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; the lithium salt is any one of LiPF6, LiBF4,LiTFSi, LiFSi and LiBOB; the additive for improving the cycling performance is any one of 3-aminopropyltriethoxysilane, hexamethyldisilane and tetraethyl silicate. The reference electrolyte has the advantages that a preparation process is simple, the prices of the solvents and the additive are cheap, and materials are saved; the reference electrolyte can have a good negative electrode lithium protection effect; after lithium-sulfur battery electrolyte is used in the lithium-sulfur battery, the cycling performance and the safety of the lithium-sulfur battery can be remarkably improved.

The invention provides an aqueous electrolyte. The aqueous electrolyte comprises water and inorganic salt; the inorganic salt comprises bis(trifluoromethane)sulfonimide lithium salt. By adoption of the specific inorganic salt-bis(trifluoromethane)sulfonimide lithium salt, the coulombic efficiency of a formed aqueous metal ion battery can be improved effectively. By adding ether compounds, particularly specific ether compounds triethylene glycol dimethyl ether or tetraethylene glycol dimethyl ether to the aqueous electrolyte which is formed by water and inorganic salt, the working voltage of the aqueous metal ion battery can be improved, relatively high electrical conductivity can be obtained, and the finally obtained aqueous electrolyte has relatively high coulombic efficiency and capacity retention ratio. Experiment results prove that the capacity retention ratio of the aqueous metal ion battery manufactured from the aqueous electrolyte can be higher than 96% and the coulombic efficiency is higher than 97% in charge-discharge at 1C after 200 cycles.

Chemical vapor deposition (CVD) precursor compositions for forming metal oxide high dielectric constant (κ) thin films. The precursor composition in one embodiment comprises a metal precursor having a general formula M(β-diketonate)₂(OR)₂, wherein M is Hf, Zr or Ti, and R is t-butyl. The precursor composition may also comprise a solvent medium selected from the group consisting of ethers, glymes, tetraglymes, amines, polyamines, alcohols, glycols, aliphatic hydrocarbon solvents, aromatic hydrocarbon solvents, cyclic ethers, and compatible combinations of two or more of the foregoing.

Disclosed is a quasi-solid softly-packaged type Na-CO<2> room temperature secondary battery. The secondary battery is characterized by comprising a porous steel plate, a positive plate, a quasi-solid polymer electrolyte membrane, a negative plate and an aluminum plastic composite membrane shell, wherein the negative plate is a metal sodium sheet; the positive plate comprises a positive electrode material of a porous structure, and a current collector; the quasi-solid polymer electrolyte membrane is positioned between the negative electrode sodium sheet and the positive electrode current collector and used for supplying sodium ions and restraining volatilization and leakage of the electrolyte; the electrolyte is a NaClO<4>/tetraethylene glycol dimethyl ether solution which is immersed in the polymer membrane; and the positive plate, the quasi-solid polymer electrolyte membrane and the negative plate form a stacked structure and are integrally packaged in the aluminum plastic composite membrane shell. The quasi-solid softly-packaged type Na-CO<2> room temperature secondary battery has the advantages of electrolyte leakage prevention, electrolyte volatilization suppression, high capacity, room temperature rechargeable performance, environment friendliness, low cost and long service; and in addition, the preparation method is simple in operation, high in controllability, high in consistency, and favorable for large-scale production.

The invention belongs to a cathode lithium protection lithium-sulfur electrolyte and a preparation method thereof. The cathode lithium protection lithium-sulfur electrolyte is prepared from an ether solvent, a lithium salt and transition metal nitrate; the ether solvent is a mixture of two solvents, a first solvent is arbitrary one of 1,3-dioxolane and 1,4-dioxane, and a second solvent is arbitrary one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; the lithium salt is arbitrary one of LiPF6, LiBF4, LiTFSi, LiFSi and LiBOB; and the transition metal nitrate is arbitrary one of La(NO3)3.9H2O, Zr(NO3)4.5H2O and Ce(NO3)3.6H2O. The cathode lithium protection lithium-sulfur electrolyte has the advantages that the configuration processis simple, the cost is low, used materials are saved, the effect of protecting cathode lithium can be exerted, the capacity retention rate and the cycle stability of a battery are enabled to be obviously improved, and the safety coefficient of the battery is greatly improved.

The invention discloses a method for continuous extraction rectification separation of an azeotrope of dimethyl carbonate and methanol. The invention relates to the method for separating dimethyl carbonate and methanol, and mainly solves a problem that operation of apparatus is not stable in a continuous production process when an ionic liquid is used as an extracting agent. The separation methodis extraction rectification, and a mixed extraction agent is adopted in extraction rectification, wherein one of the mixed extracting agents is an ionic liquid with anions of hexafluorophosphate radicals, and the mixed extraction agent is one selected from diethylene glycol dimethyl ether, triethylene glycol dimethyl ether or tetraethylene glycol dimethyl ether. The separation method can be used to realize continuous separation of dimethyl carbonate and methanol, product quality and running stability of the apparatus are stable, and the method can be applied to an industrial production process.

The invention discloses a film-type composite solid electrolyte, a preparation method thereof, and an all-solid lithium battery. The film-type composite solid electrolyte provided by the invention ismade of the material formed by lithium bisimide/polyoxyethylene/tetraethylene glycol dimethyl ether@lithium ion battery separator, which takes lithium bisimide as a lithium-inducing agent, polyoxyethylene as a polymer and binder, and tetraethylene glycol dimethyl ether as a plasticizer. The preparation method comprises the following steps: under the protection of an inert atmosphere, dissolving lithium bisimide, polyoxyethylene and tetraethylene glycol dimethyl ether in a volatile acetonitrile solvent as precursors for heating and magnetic stirring to form a uniform dilute solution, uniformlycoating the dilute solution on both sides of the lithium ion battery separator, and finally drying. The film-type composite solid electrolyte provided by the invention has many advantages such as highion conductivity at room temperature, wide electrochemical window, and low positive and negative electrode resistances when assembled into an all solid lithium battery, and is suitable for lithium batteries of various positive electrode materials.

The invention provides a separation method of an azeotrope of dimethyl carbonate and methanol. The invention relates to a separation method of dimethyl carbonate and methanol, and mainly solves the problem of unstable operation of a device in a continuous production process using ionic liquid as an extractant. The separation method is extractive distillation, the extractive distillation adopts a mixed extractant, wherein one component of the mixed extractant is ionic liquid with an anion of bistrifluoromethanesulfonimide radical, and the other component of the mixed extractant is one of diethylene glycol dimethyl ether, triethylene glycol dimethyl ether or tetraethylene glycol dimethyl ether. The separation method can realize the continuous separation of dimethyl carbonate and methanol. The product quality and the device operation are stable. The separation method can be used in the industrial production process.

The invention relates to an Li/Na-O2 secondary battery with a composite metal negative pole; the Li/Na-O2 secondary battery is a button battery. The Li/Na-O2 secondary battery is formed by assemblinga negative pole shell, a spring sheet, a gasket, an Li/Na clad sheet, a diaphragm, electrolyte, a positive plate and a porous positive pole shell, wherein the Li/Na clad sheet is a negative pole; thepositive plate consists of a positive pole catalyst with a porous structure and a current collector; the spring sheet and the gasket are stainless steel sheets; the diaphragm is positioned between a negative pole sodium plate and the positive current collector; the electrolyte is an LiClO4/NaClO4/tetraethylene glycol dimethyl ether (TEGDME) solution; the electrolyte infiltrates the diaphragm. Thebattery provided by the invention has a high discharge platform and high discharge capacity. Furthermore, compared with a lithium-oxygen battery, the cost of the Li/Na-O2 secondary battery is greatlylowered.

An ink composition, contains: an organic solvent, a metal pigment, and a resin, in which the organic solvent contains, based on the total amount of the ink composition, 60% by mass or more of diethylene glycol diethylether, 24 to 37% by mass of γ-butyrolactone and/or tetraethylene glycol dimethyl ether, and more than 1% by mass and lower than 5% by mass of tetraethylene glycol monobutyl ether, and the 50% average particle diameter in terms of sphere determined by a light scattering method of the metal pigment is 0.8 to 1.2 μm.

The invention discloses a graphene-based efficient desulfurizer for gasoline and diesel. The desulfurizer comprises raw materials in parts by weight as follows: 45-62 parts of graphene, 0.8-2.5 partsof a transition metal phthalocyanine compound, 3-4 parts of vanadium pentoxide, 2-5 parts of magnesium oxide, 1.2-2 parts of zinc oxide, 10-16 parts of polyacrylamide, 0.2-0.5 parts of tetraethylene glycol dimethyl ether, 1-2 parts of chlorophyll, 4-7 parts of folium mori, 2-4 parts of sodium hypochlorite, 6-10 parts of strong acid, 12-15 parts of activated carbon and 6-12 parts of wood flour. Bysupporting the transition metal phthalocyanine compound on graphene and adopting strong acid and sodium hypochlorite for modification, the specific surface area is increased, the adsorption activity of the surface is improved, the desulfurizer can be subjected to a reaction with sulfides under the cooperation with other components, content of the sulfides is reduced greatly, the desulfurization speed is high, and the desulfurization effect is good.

The invention discloses novel environmental-protection flux which comprises solvent, surfactants and an addition agent. Main ingredients of the flux comprise deionized water, polypropylene glycol 1200, hydroxybenzotriazole, secondary alcohol ethoxylate, tripropylene glycol n-butyl ether, tetraethylene glycol dimethyl ether, succinic acid and an aliphatic dicarboxylic acid mixture. The solvent of the flux is formed by mixing the deionized water of different types, alcohols and ethers. The mixed solvent has a suitable boiling point, more polar groups and moderate viscosity, and endows the flux with high activity. Few residues are generated. The effect of protecting the welding surface is achieved. Different types of the surfactants with different components are used in cooperation, and the surfactants have a good synergistic effect and can improve wettability of welding flux and prevent oxidation. The surface of the flux is clean, and the flux is free from halogen, low in carbon, environmentally friendly and capable of meeting the use requirement of welding.

The invention discloses a lithium ion battery fire-fighting liquid which is composed of the following raw materials in percentage by weight: 8-20% of anionic salt of 2,2,6,6-tetramethylpiperidinooxy, 2-10% of fluorocarbon surfactant, 0.2-0.8% of hydrocarbon surfactant, 0.8-5% of foaming agent, 0.4-0.7% of metal ion chelating agent, 10-20% of tetraethylene glycol dimethyl ether, 0.03% of sodium chloride, 2-5% of urea and the balance of water. The lithium ion battery fire-fighting liquid provided by the invention is characterized in that anionic salt of a nitrogen oxide capable of being oxidized and reduced is added, the anionic salt reacts with reducing gas during combustion to be reduced into a free radical scavenger of 2,2,6,6-tetramethylpiperidinooxy, hydroxyl radicals are quenched, and a chain combustion reaction is terminated; and meanwhile, the added fluorocarbon surfactant can remarkably reduce the surface tension of water, the introduced foaming agent forms a stable water film and covers the surface of the combustible, on one hand, the combustion temperature is reduced, and on the other hand, a formed water film can isolate oxygen and terminate combustion.

The invention discloses a polytetrafluoroethylene product surface treatment agent which comprises the following components in parts by weight: 50-280 parts of naphthalene, 10-50 parts of metallic sodium and 600-800 parts of a solvent, wherein the solvent is one of 1,4-dioxane, glycol dimethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, ethylene glycol butyl methyl ether, tetraethylene glycol dimethyl ether and diethylene glycol isobutyl ether. The invention further provides a preparation method for the polytetrafluoroethylene product surface treatment agent. The polytetrafluoroethylene product surface treatment agent has the advantages of safety, environmental pollution and high treatment capability; and a polytetrafluoroethylene product obtained after treatment of the surface treatment agent is good in quality and high in qualified rate.

The invention discloses an all-solid-state lithium metal-sulfur battery and a preparation method thereof. At present, the all-solid-state lithium metal-sulfur batteries have the disadvantages of largecontact resistance between solid electrolyte and anode/cathode, too thickness solid electrolyte and difficult batch production of the solid electrolyte. Electrolyte used by the all-solid-state lithium metal-sulfur battery provided by the invention is thin film type composite solid electrolyte of lithium bis(trifluoromethanesulphonyl)imide/polyoxyethylene/tetraethylene glycol dimethyl ether@lithium-ion battery separator; materials of a sulfur anode comprise sulfur powder, nanometer magnesia, a carbon nanotube, keqin black and polyoxyethylene; the surface of a sulfur anode piece is coated withlithium bis(trifluoromethanesulphonyl)imide/polyoxyethylene/tetraethylene glycol dimethyl ether; and the surface of a cathode of lithium metal is coated with lithium bis(trifluoromethanesulphonyl)imide/polyoxyethylene/tetraethylene glycol dimethyl ether. The thin film type composite solid electrolyte is capable of avoiding the aero effect of the sulfur anode; and the prepared all-solid-state lithium metal-sulfur battery has relatively high cycle stability.

The invention relates to a separation process of dimethyl carbonate and methanol, and mainly solves the problem that product purity is low in the prior art. According to the method, a separation method of dimethyl carbonate and methanol is adopted, the separation method is extraction rectification, a technical scheme that one or more selected from diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether are used as extraction agents for extraction rectification is adopted, and dimethyl carbonate and methanol products with relatively high purity can be obtained. In addition, the extraction agent is rich in source, low in price, stable in chemical property and low in toxicity, and can be used for industrial production for separating dimethyl carbonate with methanol.