831 results about "Ethylene carbonate" patented technology

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises a positive pole current collecting part and a positive pole film layer; the positive pole film layer comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises a negative pole current collecting part and a negative pole film layer, and the negative pole film layer comprises a carbon-based material; the electrolyte comprises a carboxylic ester solvent, a first additive and fluorine-containing lithium sulfimide, and the mass content of the carboxylic ester solvent is 8%-60%; the total mass content of the first additive is 2.5%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than 0, and the ethylene carbonate derivative comprises a compound shown in the formula A; the mass content of the fluorine-containing lithium sulfimide is 4%-8%. According to the invention, the rapid charging performance and the cycle performance of the battery monomer can be improved. # imgabs0 # formula A

The invention discloses a method for preparing diester terephthalate by catalyzing polyethylene glycol terephthalate (PET) to depolymerize. The method comprises the following steps: treating PET or a composite system thereof in diester carbonate under the conditions of no catalyst or taking a salt substance as a catalyst to realize chemical depolymerization of PET, so as to obtain PET monomers of diester terephthalate and ethylene carbonate, and realize complete depolymerization of PET in a composite. According to the method disclosed by the invention, through the reaction of the diester carbonate and the PET, the depolymerization of the PET under a mild condition can be realized, and the related technology research and development of chemical recovery of the PET monomer in a PET composite system or a mixed system are further carried out. The method provided by the invention has the advantages of high efficiency, greenness, mild reaction conditions and the like, can catalyze PET depolymerization to generate the monomer terephthalic acid diester, and has higher industrial application value.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises graphite particles; the electrolyte comprises a carboxylic ester solvent and a first additive, the thickness of the single-side negative electrode film layer is 50 microns to 75 microns, and the volume average particle size of the graphite particles is 8.5 microns to 13.5 microns; based on the mass of the electrolyte, the mass content of the carboxylic ester solvent is 8%-60%, the total mass content of the first additive is 3%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than or equal to 3%, and the ethylene carbonate derivative comprises a compound shown in the formula A. According to the invention, the rapid charging performance and the cycle performance of the battery monomer under high energy density can be improved. # imgabs0 # formula A

The invention discloses a lithium iron phosphate battery. The lithium iron phosphate battery comprises a positive electrode, a negative electrode, an isolating membrane and an electrolyte, a main material of the positive electrode comprises lithium iron phosphate, and a main material of the negative electrode comprises graphite and a silicon-based material; the surface density of the positive electrode is greater than or equal to 23mg / cm < 2 >, and the surface density of the negative electrode is greater than or equal to 7.8 mg The electrolyte comprises a lithium salt, a solvent and an additive, the solvent mainly comprises ethylene carbonate and a micromolecular linear solvent, the additive comprises FEC and a negative electrode film-forming additive, and a negative electrode film-forming agent comprises vinylene carbonate and a lithium salt additive; the mass fraction of the micromolecular linear solvent is 35%-60%, the mass fraction of the fluoroethylene carbonate is M, the mass fraction of the silicon element in the negative electrode layer is W1, M is greater than or equal to 2% and less than or equal to 2 * W1, and the mass fraction of the negative electrode film-forming agent is 4%-6%. The energy density of the battery cell can be improved and the cycle life and the quick charge capacity of the battery cell are both considered by doping a silicon-based material into the negative electrode, designing a thick electrode and adjusting an electrolyte formula.

The invention relates to the technical field of batteries, in particular to a battery. Comprising a positive plate and electrolyte, the positive plate comprises a positive current collector and a coating positioned on the surface edge of at least one side of the positive current collector along the length direction; the coating comprises filling particles, and the filling particles comprise at least one of inorganic particles and nitrogen-containing particles; the electrolyte comprises non-fluorinated cyclic carbonate and fluorinated ethyl acetate; the non-fluorinated cyclic carbonate comprises propylene carbonate and optional ethylene carbonate; on the basis of the total mass of the electrolyte, the content ratio C1 of the non-fluorinated cyclic carbonate is smaller than or equal to 25%, the content ratio C11 of the propylene carbonate is 3.1%-24.9%, the content ratio C12 of the ethylene carbonate is 0%-5%, and the content ratio C2 of the fluorinated ethyl acetate is 20.2%-70%. The battery provided by the invention can improve the problem of lithium precipitation under low-temperature discharge, and has relatively good short-circuit safety performance and relatively low high-temperature gas production rate.

The invention provides a secondary battery and electronic equipment, the secondary battery comprises a negative electrode plate and an electrolyte, the negative electrode plate comprises a negative electrode active material layer, the negative electrode active material layer comprises graphite and a silicon carbon material, and the average sphericity of the silicon carbon material is 0.81-0.95; the electrolyte comprises ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate, based on the mass of the electrolyte, the mass percentage content of ethylene carbonate is a%, the mass percentage content of propylene carbonate is b%, the mass percentage content of ethyl propionate is c%, the mass percentage content of propyl propionate is d%, and the range of (a + b) / (c + d) is 0.23-1.51. According to the invention, the discharge performance and the safety performance of the secondary battery at low temperature can be improved.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive active material layer, and the positive active material layer comprises lithium-containing phosphate of an olivine structure; the electrolyte comprises, by mass, 8-30% of a carboxylic ester solvent, a lithium salt and an unsaturated ester additive, the lithium salt comprises lithium hexafluorophosphate and fluorine-containing lithium sulfimide, the mass content of the fluorine-containing lithium sulfimide in the lithium salt is 18-45%, the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%, and the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%. The unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive; the amount of electrolyte in the battery cell is 2.8 g / Ah to 3.2 g / Ah. According to the invention, rapid charging and use reliability of the single battery can be considered.

The invention discloses polylactic acid polyol as well as a preparation method and application thereof. The preparation method comprises the following steps: performing a heating reaction on zinc salt, organic ammonium salt and bis (ethylene carbonate) ether to prepare an in-situ catalyst; anions of the organic ammonium salt are selected from any one of bromide ions, chloride ions and iodide ions; and adding a lactide monomer, and carrying out polymerization reaction to obtain the polylactic acid polyol. The polylactic acid polyol prepared by the invention has a flexible chain segment, can provide better flexibility, and can be applied to preparation of a polyurethane material.

The invention provides an electrochemical device and an electronic device including the same. The electrochemical device comprises a negative electrode plate and an electrolyte, the negative electrode plate comprises a negative electrode material layer, the negative electrode material layer comprises silicon, and the mass percentage A of the silicon is 1-20% based on the total mass of the negative electrode material layer; wherein the electrolyte comprises a compound shown as a formula I and fluoroethylene carbonate, and based on the total mass of the electrolyte, the mass percentage C of the compound shown as the formula I is 3%-50%. The negative pole piece and the electrolyte are simultaneously applied to the electrochemical device, so that the cycle performance of the electrochemical device is improved. # imgabs0 #

Secondary battery, including a positive electrode sheet comprising a positive electrode current collector and a positive electrode film layer, wherein the positive electrode film layer is arranged on at least one side of the positive electrode current collector and the positive electrode film layer comprises a positive electrode active material; a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer, wherein the negative electrode film layer is arranged on at least one side of the negative electrode current collector and the negative electrode film layer comprises a negative electrode active material, wherein the negative electrode active material comprises graphite and the powder compaction density of the negative electrode active material at 20,000 N is 1.5 g / cm³ 3 up to 1.85 g / cm³ 3 is; and an electrolyte comprising an organic solvent and an organic additive, wherein the organic solvent comprises a first solvent, the first solvent comprising cyclic carbonate, and the mass fraction of the first solvent, based on the total mass of the electrolyte, is 17% to 34%; wherein the organic additive comprises a first and a second additive, the first additive comprising vinylene carbonate and the second additive comprising an ethylene carbonate derivative, and the mass fraction of the first additive is 1.5% to 8% and the mass fraction of the second additive is 0.5% to 4%, each based on the total mass of the electrolyte.

The invention relates to the technical field of lithium ion batteries, and provides a lithium ion battery. The battery comprises a battery cell and a shell, the battery cell comprises an electrode assembly and electrolyte, and the electrode assembly comprises a negative plate, a diaphragm and a positive plate which are stacked in sequence; the mass ratio of the silicon element in the negative electrode active material is a%, and a is greater than or equal to 1 and less than or equal to 50; the shell comprises an aluminum layer and a first polymer layer which is positioned on the side, facing the battery core, of the aluminum layer and comprises a polyolefin material; the thickness of the first current collector of the first pole piece on the outermost side in the cell stacking direction is greater than that of the second current collector of the second pole piece with the same polarity as the first pole piece on the inner side; the thickness of the first current collector is recorded as c [mu] m; the ratio s of c to a satisfies 0.5 < = s < = 20; the electrolyte comprises a cyclic carbonate solvent containing ethylene carbonate and propylene carbonate, and the mass ratio of the cyclic carbonate solvent is smaller than or equal to 40%. The problems of swelling and damage of the packaging material caused by volume change of the silicon negative electrode can be solved, the safety of the battery is improved, and the cycle life of the battery is prolonged.

The invention provides a system and a method for producing high-purity electronic-grade carbonic ester, and the system comprises a heterogeneous reaction section, a separation section and a crystallization section along the material flow direction, the heterogeneous reaction section is used for carrying out heterogeneous reaction on ethylene oxide and carbon dioxide to prepare carbonic ester; the separation section is used for separating materials from the heterogeneous reaction section and comprises a flash evaporation unit and a rectification unit in the material flow direction, and the flash evaporation unit comprises at least one flash evaporation tank; the rectification unit comprises at least one rectification tower, and the side-draw of the rectification unit is communicated with the feed port of the crystallization section; and the crystallization section is used for crystallizing and purifying the material mainly containing carbonic ester from the separation section. According to the method, high-purity ethylene carbonate used as a power battery can be obtained from the crystallization section, and crystallization mother liquor can be selectively returned to the separation section to be concentrated. The method can effectively improve product purity, reduce product chromaticity and reduce energy consumption, and can be applied to industrial production of carbonic ester.

The invention discloses a semi-solid sodium ion battery and a preparation method thereof. An electrolyte of the semi-solid sodium ion battery is a gel polymer electrolyte formed by formation of an electrolyte solution at 50-80 DEG C, and the electrolyte solution comprises the following components in percentage by weight: 3-20wt% of a fluorine-containing acrylate monomer, 10-20wt% of a fluorine-containing acrylate monomer, 10-20wt% of a fluorine-containing acrylate monomer, 10-20wt% of a fluorine-containing acrylate monomer, 10-20wt% of a fluorine-containing acrylate monomer and the balance of a solvent, 0.01 to 0.1 wt% of an initiator; 10 to 20 weight percent of sodium salt; 2-10 wt% of an additive; and the balance of organic solvent. The organic solvent is ethylene carbonate and propylene carbonate. The fluorine-containing acrylate monomer is adopted in the gel polymer electrolyte, the polymerization degree is high, residues of unsaturated double-bond monomers in the polymer electrolyte are effectively reduced, meanwhile, fluorine free radicals are generated through decomposition under thermal runaway of a battery, the chain type combustion reaction of hydrogen and hydroxyl free radicals in a gas phase is eliminated, and the service life of the battery is prolonged. The flame retardance of the electrolyte is improved, so that the safety of the battery is improved, and the prepared semi-solid sodium-ion battery has relatively good safety and thermal stability.

This invention discloses a method for catalytically depolymerizing polyethylene terephthalate (PET) to prepare terephthalate. Under catalyst-free conditions or with a salt as a catalyst, PET or its composite system is treated in diester carbonate to achieve chemical depolymerization of PET, yielding PET monomers terephthalate and ethylene carbonate, and achieving complete depolymerization of PET in the composite. This invention, through the reaction of diester carbonate with PET, enables the depolymerization of PET under mild conditions, and further facilitates the research and development of related technologies for the chemical recovery of PET monomers from PET composite or mixed systems. The method provided by this invention has advantages such as high efficiency, environmental friendliness, and mild reaction conditions, and can catalyze the depolymerization of PET to generate its monomer terephthalate, possessing strong industrial application value.

The invention relates to an in-situ curing gel structure electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a resin matrix with a pore-forming agent, then adding a curing agent for mixing to obtain a mixed solution, and pouring the mixed solution into a closed mold for curing to obtain a resin film; soaking and drying the resin film to obtain porous resin; and (2) mixing 4-styrene sulfonyl (phenylsulfonyl) imide lithium salt, polyethylene glycol methyl ether acrylate, polyethylene glycol dimethacrylate, ethylene carbonate and azodiisobutyronitrile to prepare a mixed solution, and soaking the porous resin in the mixed solution to react and cure, thereby obtaining the in-situ curing gel structure electrolyte. The preparation method is simple, and the prepared in-situ curing gel structure electrolyte can improve the mechanical property, the battery capacity and the cycle performance of the in-situ curing gel structure electrolyte.

The invention relates to the technical field of lithium batteries, and provides a lithium ion secondary battery. In the lithium ion secondary battery, a negative plate comprises a negative active material, and the negative active material comprises a carbon material and a silicon material; the silicon material comprises a silicon-carbon composite material; based on the total mass of the negative electrode active material, the mass percentage content of the silicon-carbon composite material is recorded as b; the ratio of the mass percentage content x of the silicon element in the first region of the silicon-carbon composite material to the mass percentage content y of the silicon element in the second region is marked as B, and B is more than 0 and less than 1; the electrolyte comprises lithium bis (fluorosulfonyl) imide and fluoroethylene carbonate; on the basis of the total mass of the electrolyte, the mass percentage content of the lithium bis (fluorosulfonyl) imide is recorded as m1, and the mass percentage content of the fluoroethylene carbonate is recorded as m2; and when B, b, m1 and m2 meet the relational expression [(m1 + m2) / B] * b > = 0.2, the battery can give consideration to high energy density, low thickness swelling rate and rapid charging capability.

The invention discloses a battery monomer, a battery device and a power utilization device. A positive active material of a positive pole piece of the battery monomer comprises lithium-containing phosphate with an olivine structure, and the single-side coating weight of a positive film layer is 180mg / 1540.25 mm < 2 > to 380mg / 1540.25 mm < 2 >; the negative pole piece comprises a negative pole film layer, the negative pole film layer comprises a negative pole active material, the negative pole active material comprises a silicon-based material, and based on the mass of the negative pole active material, the mass content of the silicon element is 0.3%-10.0%; the electrolyte comprises a first additive, the first additive comprises at least one of vinylene carbonate and an ethylene carbonate derivative, the mass content of the first additive is 1%-12% based on the total mass of the electrolyte, and the compaction density of the positive electrode film layer is 2.50 g / cm < 3 >-2.80 g / cm < 3 > when the battery monomer is in a 100% state of charge.

The invention belongs to the technical field of chemical production, and particularly relates to high-purity dimethyl carbonate and a preparation method thereof. The preparation method comprises the following steps: taking ethylene carbonate and methanol as raw materials, taking an alkali alcohol solution as a catalyst, carrying out transesterification in a rectifying tower to obtain dimethyl carbonate and methanol azeotrope, and extracting the azeotrope from the top of the rectifying tower; separating the dimethyl carbonate and methanol azeotrope by adopting pressurized azeotropic distillation to obtain a dimethyl carbonate crude product; and conveying the dimethyl carbonate crude product into a falling film crystallizer for continuous falling film crystallization, controlling the temperature of low-temperature chilled water in the falling film crystallizer to be-10 to 2 DEG C and the circulating material amount to be 3-5 times of the mass of the product required to be produced, and heating to melt the material to obtain the high-purity dimethyl carbonate product. According to the preparation method provided by the invention, rectification crude purification and continuous falling film crystallization processes are adopted, and dimethyl carbonate with the purity of 99.99% or above is obtained.

The invention relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece and a negative pole piece, the positive pole piece comprises lithium-containing phosphate; the negative pole piece comprises graphite particles; the electrolyte comprises a carboxylic ester solvent, a linear carbonic ester solvent and an additive, the mass content of the carboxylic ester solvent is 10%-30%, and the mass content of the linear carbonic ester solvent is 10%-50%; the mass content of the additive is 3%-9%, the additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than 0, and the ethylene carbonate derivative comprises a compound shown in the formula A; q1, Q2, Q3 and Q4 each independently comprise any one of a hydrogen atom, a halogen atom, a C1 to C5 alkyl group or a C1 to C5 halogenated alkyl group, and Q1, Q2, Q3 and Q4 are not hydrogen atoms at the same time. # imgabs0 # formula A is shown in the specification.

The invention relates to the technical field of bentonite anti-seepage materials, and particularly discloses a pre-hydrated bentonite anti-seepage material and a preparation process thereof. The modified bentonite is prepared by mixing the following raw materials in parts by mass: 80-90 parts of calcium bentonite, 10-12 parts of a binder, 5-8 parts of an organic composite component and 3-5 parts of ethylene carbonate, the preparation method comprises the following steps: taking calcium bentonite, crushing, sieving, adding water for dispersing, adjusting the pH value, adding ethylene carbonate, heating and stirring, adding the organic composite component, continuously treating, filtering, taking a solid part, adding a binder, mixing, laminating, carrying out mold pressing treatment, and cooling, thereby obtaining the product. Wherein the organic composite component is obtained by amino-terminated modification of acylated polyethylene glycol. The water absorption rate of the pre-hydrated bentonite anti-seepage material prepared by the preparation process is greater than or equal to 5.2, the water retention rate is greater than or equal to 63.7%, and the elution risk of intercalator micromolecules can be greatly reduced.

The invention relates to a preparation method of high-purity o-phenylphenoxyethanol. The preparation method comprises the following steps: S1, reacting o-phenylphenol with ethylene carbonate in the presence of a catalyst to obtain an o-phenylphenoxyethanol crude product; s2, dissolving the o-phenyl phenoxyethanol crude product in an organic solvent; and S3, adding an anti-solvent, cooling and crystallizing to obtain the o-phenylphenoxyethanol. The o-phenylphenoxyethanol obtained by the method is high in purity, namely the HPLC (high performance liquid chromatography) purity is more than or equal to 99.5%, the single impurity is less than or equal to 0.1%, the o-phenylphenoxyethanol can be produced by conventional equipment, the process operation is simple, the production cost is low, an ethylene oxide method can be replaced, and the industrial production is easy.

The invention belongs to the field of biomass gasification catalysts, and particularly relates to a preparation method of an energy-saving corrosion inhibition type decarburizing agent. According to the invention, under the action of the catalyst, ethylene carbonate and methylamine are adopted as basic raw materials to synthesize N-methyldiethanolamine, and then 1, 3-propane sultone is adopted to modify N-methyldiethanolamine, so that the carbon dioxide absorption amount and absorption rate of N-methyldiethanolamine are improved; the activating agent is added into the energy-saving corrosion-inhibition type decarburizing agent, so that the absorption rate of the decarburizing agent on carbon dioxide can be effectively improved, and the desorption energy consumption of the carbon dioxide is reduced; and the corrosion inhibitor is added, so that the corrosion of metal equipment can be effectively reduced.

The embodiment of the invention relates to a method for initiating in-situ polymerization of an electrolyte solution through electrochemical induction. A solvent of the electrolyte solution comprises cyclic ether molecules and halogen atom substituted ethylene carbonate molecules; the method comprises the following steps: carrying out constant-current charging on a battery to a set voltage, and carrying out constant-voltage charging for a specific time under the set voltage, so that halogen atoms of halogen atom substituted ethylene carbonate molecules are removed under the reduction potential of the negative electrode side of the battery to generate free radical sites, two molecular structures after halogen atoms are removed are mutually combined through the free radical sites to form a dimer, the dimer is migrated to the positive electrode side in an electrolyte solution, dehydrogenation reaction is carried out under the action of oxidation potential applied to the positive electrode side, and in-situ ring-opening polymerization reaction of cyclic ether molecules is initiated through removed hydrogen ions; therefore, in-situ polymerization solidification of the electrolyte solution is realized under the condition that a conventional initiator is not contained.

The invention relates to the technical field of modified polyurethane preparation, in particular to a modified rigid polyurethane foam material and a preparation method thereof.The material is specifically prepared from CO2-based polyol, polyether, deionized water, a foaming agent, a catalyst, a foam stabilizer and isocyanate. Wherein CO2-based polyol is introduced into original polyether polyol, specifically, poly (ethylene carbonate) polyol is added, so that the heat conductivity coefficient of the material can be reduced, the compression strength of the material can be improved, and the low-cost and high-performance polyurethane foam can be prepared. The finally prepared rigid polyurethane foam material has the characteristics of good heat insulation property and high pressure resistance; and the whole preparation process is simple, the whole cost is low, and the market competitiveness is high.

The present invention provides a non-aqueous electrolyte including a lithium salt, an organic solvent, and an additive, wherein the additive includes a compound represented by Formula 1 below and lithium difluoro(oxalato)borate (LiODFB), and the organic solvent includes ethylene carbonate (EC), propylene carbonate (PC), ethylene propionate (EP), and propyl propionate (PP). In Formula 1 above, n is an integer of 3 to 10.

The invention relates to a lithium ion battery. In order to solve the problem that the performance of the battery is influenced by solvent decomposition and gas production due to the fact that active oxygen is released in the using process when a lithium supplementing agent is added, a solvent ethylene carbonate in an electrolyte is promoted to be subjected to a ring-opening reaction, and the lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and the electrolyte, the positive electrode comprises a positive electrode active material and a lithium supplement agent, the electrolyte comprises an organic solvent, a lithium salt and an additive, the organic solvent comprises fluoro carboxylic ester, fluoro ether and carbonic ester and does not contain ethylene carbonate, and the additive comprises trimethylsiloxyethyl isocyanate and / or 2-(1, 1-thiophane-3-dioxide)-2, 2-methyl difluoroacetate. Through the synergistic effect of the solvent system and the additive, the stability of the electrolyte in a battery containing a lithium supplement agent is improved, the wettability and low-temperature performance of the battery, especially a high-compaction battery, are improved, and meanwhile, the lithium ion battery has relatively good normal-temperature cycle performance and high-temperature performance.

The invention provides a secondary battery and an electric device. The secondary battery comprises a negative electrode plate and a non-aqueous electrolyte, the negative electrode plate comprises a negative electrode active material, the volume average particle size Dv50 of the negative electrode active material is 6-20 [mu] m, the non-aqueous electrolyte comprises an additive and a non-aqueous solvent, and the additive comprises a cyclic sulfate compound represented by formula (I); the non-aqueous solvent comprises ethylene carbonate; # imgabs0 #

The invention belongs to the technical field of biodegradable mulching films, particularly relates to a biodegradable mulching film and a preparation method thereof, and provides the following scheme aiming at the problem that the existing biodegradable mulching film material is poor in tensile strength due to the physical and chemical properties of the existing biodegradable mulching film material, so that the agricultural machinery operation requirement cannot be met. The invention discloses a degradable plastic film which is prepared from the following raw materials in parts by weight: 20-35 parts of starch, 5-15 parts of cellulose, 5-15 parts of chitosan and 10-30 parts of polylactic acid. The degradable plastic film is prepared from the following components in parts by weight: starch, cellulose, chitosan, polylactic acid, poly (butylene adipate-co-terephthalate), polymethyl ethylene carbonate, polyhydroxyalkanoate, a polyethylene cross-linking agent, ammonium stearate and calcium carbonate. By using the humus concentrated solution, the light stabilizer, the antifogging agent, the antistatic agent, the compatilizer, the polyethylene wax, the phenyl salicylate, the talcum powder, the mica powder and the kaolin, the tensile strength and the stability of the mulching film are effectively improved, so that the agricultural machinery operation requirements can be met.

The invention relates to the technical field of lithium ion battery electrolytes, and discloses a low-temperature electrolyte for a lithium ion battery, the lithium ion battery and application of the lithium ion battery. The low-temperature electrolyte for the lithium ion battery is characterized by comprising a lithium salt, an organic solvent, a film-forming additive and a functional additive, according to the volume percentage, the organic solvent accounts for 85%-96%, the film-forming additive accounts for 3%-10%, and the functional additive accounts for 1%-5%. The organic solvent is linear carboxylic ester. In the low-temperature electrolyte for the lithium ion battery, both the linear carboxylic ester and the halogenated linear carboxylic ester contain C = O polar groups, have relatively high dielectric constants and can effectively dissolve lithium salt, so that the electrolyte keeps high ionic conductivity; halogenated linear carboxylic ester is decomposed prior to linear carboxylic ester, and an SEI film rich in lithium halide is formed on the surface of the negative electrode. Compared with an ethylene carbonate-based electrolyte, the lithium halide-rich SEI film formed by the electrolyte provided by the invention is low in impedance, rapid ion transmission is facilitated, and the low-temperature charge-discharge performance of the battery is remarkably improved.

The invention discloses a lithium manganese iron phosphate secondary battery and device, and relates to the technical field of lithium manganese iron phosphate batteries. The lithium manganese iron phosphate secondary battery comprises an electrolyte and a positive pole piece, wherein the positive pole piece comprises a lithium manganese iron phosphate positive pole material; the electrolyte comprises an additive and an organic solvent, the additive comprises vinylene carbonate, and the mass of the vinylene carbonate accounts for 0.8%-1.7% of the total mass of the electrolyte; the organic solvent comprises ethylene carbonate, and the mass of the ethylene carbonate is 10-19% of the total mass of the electrolyte; the mass content of the fluorine element in the electrolyte is 7.5%-12.75%; the mass content of fluoroethylene carbonate in the electrolyte is less than 10 ppm, and the mass content of boron is less than 10 ppm. According to the invention, the contents of vinylene carbonate, ethylene carbonate and total fluorine element in the electrolyte are accurately controlled, and meanwhile, the contents of fluoroethylene carbonate and boron element are strictly limited to be less than a preset threshold value, so that the dissolution of manganese ions is effectively inhibited, and the cycle life of the battery at high voltage and high temperature is remarkably prolonged.