45 results about "Difluoroacetic acid" patented technology

The invention relates to the technical field of batteries, in particular to a lithium ion secondary battery. The lithium ion secondary battery comprises a negative plate and electrolyte, the negative plate comprises a negative current collector and a negative active layer located on at least one side surface of the negative current collector, the negative active layer comprises a first coating and a second coating which are arranged in the thickness direction of the negative plate, and the first coating is located between the negative current collector and the second coating; the second coating comprises first silicon carbon, and the sphericity degree of the first silicon carbon is 0.8-1; the silicon content of the first silicon carbon is 30%-60%; the average particle size of the first silicon carbon is R1, and R1 is more than 6 microns and less than or equal to 15 microns; the electrolyte comprises a fluorine-containing solvent and a nitrile compound, the fluorine-containing solvent comprises fluoroethylene carbonate and / or ethyl difluoroacetate, based on the total weight of the electrolyte, the content of the fluorine-containing solvent is w1, and w1 is larger than or equal to 30% and smaller than or equal to 70%; the content of the nitrile compound is w2, and 0.4% < = w2 < = 7%. The lithium ion secondary battery provided by the invention has good cycling stability and dynamic performance at high voltage and high temperature.

A method for producing an aromatic heterocycle-substituted difluoroacetic acid derivative having a partial structure represented by the formula (III), by reacting an N-oxido aromatic heterocyclic compound having a partial structure represented by the formula (I) with tetrafluoroethylene in the presence of a compound represented by the formula (II): R—YH, in a solvent selected from an aromatic hydrocarbon solvent, an ester solvent and an ether solvent:

The invention relates to the technical field of batteries, and provides a battery. The battery comprises a positive plate, a negative plate and electrolyte, the negative plate comprises a negative current collector and a negative active material layer arranged on at least one side surface of the negative current collector, and a plurality of concave parts are arranged on the surface of one side, far away from the negative current collector, of the negative active material layer; the negative active material layer comprises a silicon-based material and a carbon-based fiber material, and the length-diameter ratio of the carbon-based fiber material is 10-500; the electrolyte comprises a first solvent, and the first solvent comprises ethyl difluoroacetate; based on the total mass of the electrolyte, the mass ratio of the first solvent is 20.2%-75.1%. According to the battery, the cycling stability under high-voltage and high-temperature working conditions can be improved while the quick charging performance is ensured.

The invention relates to a preparation method of trifluoromethylsulfonyl fluoride, which comprises the following steps: taking fluorosulfonyl difluoroacetic acid, fluorosulfonyl difluoroacetate or fluorosulfonyl difluoroacetyl fluoride as raw materials, and reacting with fluorine gas to obtain the product trifluoromethylsulfonyl fluoride. According to the method, the fluorosulfonyl difluoroacetic acid (ester or acyl fluoride) directly reacts with the fluorine gas, and complex multi-step reaction and separation and purification of intermediate products are not needed, so that the process flow is simplified, the production links are reduced, and the production efficiency is improved; the method has the advantages of low price of raw materials, mild reaction conditions, low requirements on equipment, realization of continuous production, and reduction of the equipment investment and the production cost; the preparation method is carried out under an anhydrous condition, does not need to use any organic solvent, and is environment-friendly and green; by controlling the reaction conditions, the yield of the trifluoromethylsulfonyl fluoride can reach 85%, the purity of the trifluoromethylsulfonyl fluoride can reach 99.9%, the requirements of different fields for high-purity products can be met, and the method has a good industrial application prospect.

A lithium-ion battery includes an electrolyte, a negative electrode plate and a positive electrode plate. The electrolyte includes a fluorinated solvent, the fluorinated solvent comprises a difluoroethyl acetate; and with a content of the difluoroethyl acetate being f wt % based on a total weight of the electrolyte, and a ratio of a width of the negative electrode plate to a width of the positive electrode plate being g, the lithium-ion battery satisfies a following relation: 2≤f / g≤30.

The embodiment of the invention provides a bromo-ethyl difluoroacetate-mediated novel amide dehydration cyaniding method, which comprises the following steps of: heating and reacting 0.2 mmol and 1.0 equivalent weight of amide compound and 0.6 mmol and 3.0 equivalent weight of bromo-ethyl difluoroacetate for 24 hours under an oil bath condition of 90 DEG C to generate an experimental reactant; concentrating the experimental reactant under reduced pressure to obtain a residue; and purifying the residue by silica gel rapid column chromatography to obtain the target product nitrile compound. According to the scheme, the process reaction conditions are mild, a strict anhydrous and anaerobic environment is not needed, the harsh requirements on equipment and operation are greatly reduced, and the production safety and practicability are improved. Acetone is used as a solvent, so that high-efficiency reaction can be realized, the solvent after reaction is convenient to recycle and recycle, the production cost and the environmental burden are remarkably reduced, and the remarkable green chemical engineering characteristic is embodied.

The invention provides a preparation method and application of an all-solid-state lithium ion battery, the all-solid-state lithium ion battery comprises a positive electrode, a negative electrode and a solid electrolyte, and the preparation method comprises the following steps: adding an interface modifier into raw materials of the positive electrode and / or the solid electrolyte, the fluoro anhydride is selected from at least one of difluoroacetic anhydride, trifluoroacetic anhydride, pentafluoropropionic anhydride or heptafluorobutyric anhydride. According to the preparation method and application of the all-solid-state lithium ion battery provided by the invention, the interfacial compatibility of the solid electrolyte with the positive electrode and the negative electrode can be remarkably improved, and the cycle performance of the high-voltage all-solid-state lithium ion battery is improved.

The invention relates to the field of macromolecules, and discloses a method for refining polyetherketoneketone and a polyetherketoneketone refined product. The method comprises the following steps: (1) treating a polyetherketoneketone complex by adopting a pretreatment agent; (2) the polyether ketone ketone crude product and a mixed chain supporting solution are mixed and washed, a first product is obtained, the mixed chain supporting solution comprises a main chain supporting agent and a cosolvent, the main chain supporting agent comprises one or more selected from parachlorophenol, trifluoroacetic acid, difluoroacetic acid, dichloroacetic acid and chloroacetic acid, the cosolvent comprises one or more selected from N, N-dimethylformamide and dimethyl sulfoxide, and the main chain supporting agent comprises one or more selected from dichlorophenol, trifluoroacetic acid, difluoroacetic acid, dichloroacetic acid and chloroacetic acid. The solvent is one or more of water, N-methyl pyrrolidone and N-methyl formamide; (3) adding a mixed aqueous solution into the first product to remove at least part of metal ions to obtain a second product; and (4) washing the second product for multiple times by using an organic solvent, and washing and drying to obtain the refined polyether ketone ketone. The content of aluminum ions in the polyetherketoneketone prepared by the method is low.

The invention discloses an ester-based low-temperature electrolyte for a sodium metal battery. The ester-based low-temperature electrolyte comprises an ester-based organic solvent, a solute and an additive, the ester-based organic solvent is a mixture of a carboxylic ester solvent and fluoroethylene carbonate; the carboxylic ester solvent is ethyl difluoroacetate; the solute is a mixture of bis (fluorosulfonyl) imide sodium and sodium trifluoroacetate; the additive is tris (trimethylsilyl) phosphite ester. Through specific combination of the components of the ester-based electrolyte, the sodium metal battery can normally work in an extreme low-temperature environment (lower than-40 DEG C) of-60 DEG C.

The invention discloses a fluorine-containing medical intermediate ethyl difluoroacetate and a preparation method thereof, and belongs to the technical field of synthesis of organic fluorine compounds. The method comprises the following steps: firstly, taking tetrafluoroethylene and ethanol as raw materials, and reacting under the action of a basic catalyst to prepare an intermediate 1, 1, 2, 2-tetrafluoroethyl ether with stable properties; and then gasifying the intermediate, and performing catalytic cracking through a modified gamma-aluminum oxide catalyst bed layer subjected to specific high-temperature pre-fluorination treatment under the mild condition of 160-190 DEG C to generate high-activity difluoroacetyl fluoride in situ, and finally, directly introducing the cracking gas containing difluoroacetyl fluoride into a low-temperature reaction solution containing ethanol and an acid-binding agent without separation, and carrying out esterification reaction. According to the method, a brand-new synthesis route and a special catalyst are adopted, reaction conditions are mild, the cracking step selectivity is high, the production efficiency and the total yield are remarkably improved through integrated process design, and the technological process is simple, safe and reliable.

The application relates to the technical field of organic synthesis, in particular to a preparation method of ethyl difluoroacetate, which comprises the following steps: S1, 2,2-difluoro-1,1-dichloroethyl ethyl ether is added into a reaction kettle, concentrated sulfuric acid is added dropwise under stirring at a certain reaction temperature, after the dropwise addition is completed, the reaction is continuously kept for reaction completion, and a compound shown in formula I is obtained; S2, water is added into a reaction container, the compound shown in formula I prepared in the step S1 is added dropwise into the reaction container for hydrolysis reaction at a certain temperature, after the reaction is completed, the reaction is allowed to stand and is separated into layers, and the lower organic layer is ethyl difluoroacetate; the application has the advantages of simple process, easily obtained raw materials, mild reaction conditions, easy control, high product yield, few by-products, reaction condition detection at any time, one-time reaction completion, secondary recovery treatment avoidance, raw material loss reduction and easy industrialized production.

An electrolyte, a secondary battery, and an electronic device. The electrolyte comprises ethyl 2,2-difluoroacetate, 1,2,3-tris(2-cyanoethoxy)propane, and 1,3-propane sultone. Based on 100 parts by mass of the electrolyte, ethyl 2,2-difluoroacetate accounts for 1.5 to 6 parts by mass, 1,2,3-tris(2-cyanoethoxy)propane accounts for 0.5 to 4 parts by mass, and 1,3-propane sultone accounts for 1 to 5.5 parts by mass. The overcurrent and overtemperature safety of secondary batteries are improved.

The invention relates to the technical field of batteries, and provides a battery, which comprises a pole piece and an electrolyte, the electrolyte comprises ethyl difluoroacetate, lithium bis (trifluoromethylsulfonyl) imide and lithium hexafluorophosphate; the mass ratios of the ethyl difluoroacetate and the lithium bis (trifluoromethylsulfonyl) imide in the electrolyte are respectively recorded as a% and b%; 20.2 < = a < = 75.1; 0.5 < = b < = 12; the pole piece comprises a current collector, a first layer and a second layer, the second layer is located between the current collector and the first layer, and the thickness of the first layer is 1-15 nm; the second layer is an active material layer; the pole pieces comprise a positive pole piece and a negative pole piece; the second layer of the negative plate comprises a silicon-based material; the first layer of the negative plate comprises elements N and P, the content ratio of the elements N to P is c, and c is more than or equal to 0.015 and less than or equal to 60; the first layer of the positive plate comprises elements F and S, the content ratio of the elements F to S is d, d is larger than or equal to 5 and smaller than or equal to 80, and the needling safety performance and the cycle performance of the battery can be improved.

The invention discloses a method for preparing triphenyl sulfonium salt containing a ketal structure and purifying an isomer of the triphenyl sulfonium salt, which comprises the following steps: S1, carrying out condensation reaction on sodium difluoroacetate sulfonate and keto-containing alcohol to obtain keto-containing sodium difluorosulfonate acetate; s2, enabling the keto-containing sodium difluorosulfonate acetate to react with triphenyl sulfur chloride, so as to obtain keto-containing triphenyl sulfonium salt; s3, the keto-containing triphenyl sulfonium salt and D-ketonic acid lactone are subjected to a reaction, and a mixed product containing a ketal structure triphenyl sulfonium salt isomer is obtained; s4, dissolving the mixed product in C1-C4 fatty alcohol, cooling, crystallizing, filtering and drying to obtain a purified product; the content of the cis-triphenylsulfonium salt containing the ketal structure in the purified product is 95% or above. The obtained triphenyl sulfonium salt containing the ketal structure is stable in structure and good in solubility, the purity of the product is improved through C1-C4 fatty alcohol and a cooling crystallization method, and the problem of insufficient purity caused by poor batch stability in a synthesis process is effectively solved.

The present invention relates to an electrolyte composition comprising at least a sodium salt dissolved in at least one solvent and a combination of additives, wherein: the solvent is selected from the group consisting of ethylene glycol carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, propylene carbonate, ethyl acetate, ethyl propionate, methyl propionate, 4-fluorotoluene, 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether, difluoroethylene glycol carbonate, ethyl difluoroacetate and mixtures thereof; and the combination of additives comprises at least sodium difluoro(oxalato)borate (NaODFB) and tris(trimethylsilyl)phosphite (TMSPi).

An electrolyte. The electrolyte comprises a fluorine-containing ester additive. The ratio of the fluorine-containing ester additive in the electrolyte is 2-9% by mass percentages. The fluorine-containing ester additive comprises 2,2-difluoroethyl acetate, difluoroethylene carbonate and trifluoroethyl methyl carbonate.

This invention provides a battery and an electrical device, including a positive electrode sheet comprising a positive electrode active material, the positive electrode active material being doped with and / or coated with aluminum; a negative electrode sheet comprising a negative electrode active material, the negative electrode active material comprising silicon particles; an electrolyte comprising a first solvent, a second solvent, a first additive, a second additive, and a third additive; the first solvent comprising ethyl 2,2-difluoroacetate, the second solvent comprising propylene carbonate, the first additive comprising 1,3-propanesulfonate lactone, the second additive comprising vinyl sulfate, and the third additive comprising succinate; this invention, through the synergistic design of a full battery system of "aluminum-modified positive electrode + silicon-based negative electrode + multifunctional composite electrolyte," achieves excellent low-temperature discharge performance, ultra-long cycle life, high interface stability, and outstanding thermal safety characteristics while maintaining high energy density.

The present invention relates to the field of battery technology, and in particular to a lithium-ion battery and an electronic device including the lithium-ion battery. The lithium-ion battery includes a negative electrode sheet and an electrolyte; the negative electrode sheet has a first surface and a second surface opposite to each other in the thickness direction, the first surface has a plurality of protrusions, the second surface has a plurality of concave portions, the protrusions and the concave portions correspond, and the ratio of the sum of the orthographic projection areas of the protrusions on the first surface to the area of the negative electrode sheet is S; the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer on at least one side of the negative electrode current collector, the negative electrode active material layer includes a silicon-based material; the electrolyte includes ethyl 2,2-difluoroacetate with a content of F1 and 1,1,2,2,-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether with a content of F2, 1.9≤(F1+F2) / S≤984. The lithium-ion battery of the present invention has the characteristics of long high-temperature cycle life and high safety.

This invention provides a battery and an electrical device, comprising a positive electrode sheet including a positive active material, the positive active material being doped with and / or coated with aluminum; a negative electrode sheet including a negative active material, the negative active material including silicon particles; and an electrolyte including a first solvent, a second solvent, a first additive, and a second additive; the first solvent including ethyl 2,2-difluoroacetate, the second solvent including a chain-like fluorosulfonamide compound, the first additive including mannitol carbonate sulfate, and the second additive including fluoroethylene carbonate. This invention, through the introduction of aluminum into the positive active material, the use of silicon particles in the negative active material, and the synergistic design with the multi-component solvent and additives in the electrolyte, achieves a comprehensive improvement in the battery's cycle performance, interface stability, and safety, making it particularly suitable for high-energy-density lithium-ion battery applications.

The invention belongs to the technical field of organic synthesis, and particularly provides a preparation method of 2, 2-difluoro-N-methoxy-N-methylacetamide. According to the preparation method provided by the embodiment of the invention, the preparation method comprises the following step: carrying out condensation reaction on 2, 2-difluoroacetyl chloride and N, O-dimethylhydroxylamine hydrochloride to generate 2, 2-difluoro-N-methoxy-N-methylacetamide. According to the preparation method disclosed by the embodiment of the invention, the 2, 2-difluoroacetyl chloride is taken as a starting raw material to react with the N, O-dimethylhydroxylamine hydrochloride to obtain the 2, 2-difluoro-N-methoxyl-N-methylacetamide, and compared with difluoroacetic anhydride, the 2, 2-difluoro-N-methoxyl-N-methylacetamide is higher in activity, high in yield and simple and convenient to operate.

The invention belongs to the technical field of electrolytes, and particularly discloses a flame-retardant low-temperature-resistant high-voltage high-entropy electrolyte for a lithium metal battery, a preparation method of the electrolyte and the battery. Solvents of the electrolyte comprise fluoroethylene carbonate, methyl trifluoroethyl carbonate, ethyl difluoroacetate, methyl trifluoroacetate and ethoxypentafluorocyclotriphosphazene; the volume ratio of the fluoroethylene carbonate to the methyl trifluoroethyl carbonate to the ethyl difluoroacetate to the methyl trifluoroacetate to the ethoxypentafluorocyclotriphosphazene is (1-5): (2-6): (2-6): (2-6): (0.5-1.5), and the concentration of the lithium hexafluorophosphate is 0.5-1.5 mol / L. The electrolyte has good high voltage tolerance, allows a ternary positive electrode (NCM 811) to operate at a high cut-off voltage of 4.8 V, has good low temperature tolerance, and allows a commercially feasible lithium metal battery to show good cyclicity at-20 DEG C.

The invention relates to the technical field of lithium ion batteries, and provides an electrolyte without ethylene carbonate and a lithium ion battery. The electrolyte comprises a first solvent, a second solvent, a third solvent, a first lithium salt and a second lithium salt, the first solvent comprises propylene carbonate; the second solvent comprises ethyl difluoroacetate; the third solvent comprises n-propyl propionate; in the electrolyte, the content of a first solvent is 1%-8%, the content of a second solvent is 20.2%-75.1%, and the content of a third solvent is 5%-35%; the first lithium salt comprises lithium bis (trifluoromethylsulfonyl) imide, and the second lithium salt comprises lithium hexafluorophosphate; the content of the first lithium salt is marked as A%, the content of the second lithium salt is marked as B%, and 0.1 < = A / B < = 2. According to the electrolyte provided by the invention, the fast charging performance of the battery can be improved on the basis of ensuring high-temperature cycling stability and thermal safety performance in a high-voltage cycling system.

The invention relates to the technical field of batteries, and discloses a battery, which comprises a battery cell, a shell and an electrolyte, the battery cell comprises a negative electrode plate, the negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer comprises a silicon-based material; the shell comprises a first side wall, the first side wall comprises a first part and a second part, the second part is connected to the first part, the second part is located at least one end of the extension direction of the first side wall, and the first part is sunken towards one side close to the battery cell relative to the second part; the electrolyte comprises a fluorine-containing compound, and the fluorine-containing compound comprises at least one of ethyl difluoroacetate and fluoroethylene carbonate; the concave distance T of the first part relative to the second part is greater than or equal to 0.1 mm and less than or equal to 0.8 mm; the mass ratio c of the silicon element in the negative electrode active material layer is 1.5%-50%; and based on the total mass of the electrolyte, the mass ratio A of the fluorine-containing compound is 8-70%. The invention has the effects of preventing shell corner breakage and prolonging the cycle life of the battery.

The invention relates to the technical field of batteries, and provides an electrolyte and a lithium ion battery, the electrolyte comprises Awt% of ethyl difluoroacetate, Bwt% of ethylene carbonate, Cwt% of fluoroethylene carbonate and Dwt% of a first nitrile additive, C > B, A + B + C is more than or equal to 20 and less than or equal to 60, and (B + C) / D is more than or equal to 4 and less than or equal to 40; wherein the first nitrile additive comprises a compound as shown in a formula I which is described in the specification. The electrolyte can ensure that the battery adapts to a wide-temperature-range working environment, has good cycle life and safety performance, and can ensure the stability and safety of the high-voltage and high-energy-density battery.

The invention relates to the technical field of batteries, in particular to a lithium ion battery. The lithium ion battery comprises a negative electrode plate and electrolyte, the negative electrode plate comprises a negative electrode current collector and a negative electrode active layer located on the surface of one side or two sides of the negative electrode current collector, the negative electrode active layer comprises a silicon material, and the weight content of the silicon material in the negative electrode active layer is 7%-60%; the electrolyte comprises ethyl difluoroacetate and fluorobutyronitrile, the fluorine atom substitution number of the fluorobutyronitrile is 1-4, based on the total weight of the electrolyte, the weight content of the ethyl difluoroacetate is 20%-60%, the weight content of the fluorobutyronitrile is 2%-20%, and the ratio of the weight of the fluorobutyronitrile to the weight of the ethyl difluoroacetate is 0.08-0.8. According to the lithium ion battery disclosed by the invention, the electrolyte can continuously repair the damaged SEI film, and meanwhile, the dynamic performance of the electrolyte is improved, so that the battery has relatively high fast charging performance and cycling stability.

The invention discloses a preparation method of 1-(3, 5-difluoro-2-hydroxybenzene) ethyl-1-ketone, which comprises the following steps: (1) taking a compound (III) 2, 4-difluorophenol as an initial raw material, and carrying out substitution reaction on the compound (III) 2, 4-difluorophenol and acetyl chloride to generate a compound (II) 2, 4-phenyl difluoroacetate; and (2) carrying out an intramolecular Friedel-Crafts reaction on the compound (II) 2, 4-phenyl difluoroacetate to prepare a compound (I), namely the 1-(3, 5-difluoro-2-hydroxybenzene) ethyl-1-ketone. Compared with a traditional method, the preparation method disclosed by the invention has the following advantages: firstly, reaction conditions are mild, and dangerous chemical reactions are not involved; 2, the operation is simple, complicated purification modes such as column chromatography are avoided, and kilogram-level preparation is facilitated; 3, the raw materials are cheap and easy to obtain, the cost is lower, the steps and atom economy are better, and efficient synthesis economics is met; and 4, the total yield is high, and the method has great economic value.

This application relates to a battery and an electrical device. The battery includes a positive electrode, a negative electrode, a separator, and an electrolyte; the positive electrode active material layer includes aluminum; the separator includes an oxide solid electrolyte coating; the electrolyte includes a solvent, an additive, and a lithium salt; the solvent includes a first solvent and a second solvent; the additive includes a first additive and a second additive; the first solvent includes propylene carbonate and / or ethylene carbonate, and the second solvent includes ethyl 2,2-difluoroacetate and / or trifluoroethyl methyl carbonate; the first additive includes mannitol sulfate, and the second additive includes ethylene sulfate; 0.08≤(A+C+D)×10000 / X≤0.77; 0.05≤(C+D)×100 / (B+W)≤2.77; 3.23≤(C+H) / B≤63.97. The solution provided in this application results in a battery exhibiting excellent thermal shock safety and high and low temperature cycling performance.

The present invention is used in the field of lithium-ion battery technology, and discloses a non-aqueous electrolyte comprising the following substances by weight: 5-20% electrolyte lithium salt, 70-90% organic solvent, and 2%-9% functional additives, wherein the functional additives include fluorosulfonyl difluoroacetate pentafluorocyclotriphosphazene. Compared with the classic ethoxy pentafluorocyclotriphosphazene, fluorosulfonyl difluoroacetate pentafluorocyclotriphosphazene has more sulfonyl and ester groups. The corresponding positive electrode electrolyte interface layer (CEI) rich in inorganic lithium salts such as lithium sulfate and lithium fluoride can stabilize the interface between the positive electrode and the electrolyte at high voltage, suppress the rise in impedance, and make the stable circulation of 5-volt spinel a reality. The introduction of ester groups can increase the solubility of lithium salts in the electrolyte, reduce the viscosity of the solution, improve the wetting ability, and have a good flame retardant effect. Batteries containing fluorosulfonyl difluoroacetate pentafluorocyclotriphosphazene additive electrolytes show better electrochemical performance than the control group.

The invention relates to the field of medicinal chemistry, and discloses application of 7-hydroxy-2 (1H)-quinolinone derivatives containing ethyl difluoroacetate in resisting triple negative breast cancer cells, in particular to application of 3-(7-hydroxy-2-oxo-1, 2-dihydroquinolin-3-yl)-5-(4-methylphenyl)-2, 2-ethyl difluorovalerate (3a), 3-(7-hydroxy-2-oxo-1, 2-dihydroquinolin-3-yl)-5-(4-methylphenyl)-2, 2-ethyl difluorovalerate (3a), 3-(7-hydroxy-2-oxo-1, 2-dihydroquinolin-3-yl)-5-(4-methylphenyl)-2, 2-ethyl The compound has a high-selectivity killing effect on triple-negative breast cancer cells, and further cell experiments and animal experiments show that the compound has the efficacy obviously higher than that of paclitaxel in the aspect of killing the triple-negative breast cancer cells, has the characteristic of low toxicity, and has a good development prospect.

The invention discloses a purification method of difluoroethanol, and belongs to the technical field of fine chemical engineering. According to the purification method, water and ethyl difluoroacetate in a crude product difluoroethanol are separated and removed by adding an entrainer, and the difluoroethanol with the purity larger than or equal to 99.95% is obtained; wherein the entrainer is selected from one or more of carbon tetrachloride, cyclohexane, benzene and ethanol. The separation method comprises the following steps: adding an entrainer into a water-containing crude product difluoroethanol, so as to change the relative volatility of each component of the crude product difluoroethanol, break the original azeotropic equilibrium of difluoroethanol and water, realize effective separation of difluoroethanol, water and ethyl difluoroacetate, and achieve the purpose of purification.