45 results about "Vinylene carbonate" patented technology

Lithium secondary battery, comprehensive a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte, wherein: the positive electrode comprises a positive electrode active material, wherein the positive electrode active material comprises lithium iron phosphate particles and the positive electrode has a loading amount of 450 mg / 25 cm² 2 up to 740 mg / 25 cm 2 exhibits; and the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises a solvent based on a cyclic carbonate and a solvent based on a linear carbonate, wherein the solvent based on a cyclic carbonate comprises ethylene carbonate and the solvent based on a linear carbonate comprises dimethyl carbonate, the additive comprises vinylene carbonate and the dimethyl carbonate is present in an amount of 5 vol% to 75 vol% in the organic solvent and the weight ratio of vinylene carbonate to dimethyl carbonate is greater than 0 to 0.2 or less.

The embodiment of the application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises: a shell, the shell comprising a shell body, a positive electrode end cover assembly and a negative electrode end cover assembly; an electrode assembly, the electrode assembly comprising a positive electrode sheet and a negative electrode sheet, and the electrode assembly is a laminated structure; the electrode assembly comprises a main body part and a tab part located at an end face of the main body part, and a size of the main body part in a first direction is greater than 400 mm; a single surface area density of a positive electrode film layer of the positive electrode sheet is greater than 375 mg / 1540.25 mm 2 ; an electrolyte, the electrolyte comprising a lithium salt and an additive; the lithium salt comprising at least one of lithium hexafluorophosphate and lithium bisfluorosulfonylimide; the additive comprising at least one of vinylene carbonate and a silane additive; and a mass content of the lithium salt is 14% to 20% and a mass content of the additive is 2% to 5% based on a total mass of the electrolyte. The battery monomer provided by the application considers both high energy density and fast charging long service life.

A battery. The battery comprises a positive electrode sheet and an electrolyte; the positive electrode sheet comprises lithium iron phosphate; the electrolyte comprises vinylene carbonate and a silicon-based fluorophosphate compound represented by formula I: formula I; in formula I, R1, R2 and R3 are each independently selected from any one of H, F, C1-C4 alkyl, C1-C4 fluoroalkyl, C2-C4 alkenyl, C2-C4 fluoroalkenyl, C2-C4 alkynyl, C2-C4 fluoroalkynyl, C5-C7 cycloalkyl, R4 substituted phenyl, and R5 substituted benzyl, and R4 and R5 are each independently selected from any one of C1-C4 alkyl, C2-C4 alkenyl, C2-C4 alkynyl, C1-C4 fluoroalkyl, C2-C4 fluoroalkenyl, C2-C4 fluoroalkynyl, and F.

An electrolyte, a battery cell, and a vehicle with a vehicle battery is provided. The electrolyte includes a ternary salt, dual-cyclic solvents, a linear carbonate solvent, and quaternary additives. The ternary salt includes lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide (LiFSI), and lithium difluoro(oxalate)borate (LiDFOB). The dual-cyclic solvents include ethylene carbonate (EC) between 0-30% by volume and fluoroethylene carbonate (FEC) between 0-30% by volume. The linear carbonate solvent includes at least one of ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), or diethyl carbonate (DEC). The linear carbonate solvent is between 60-80% by volume. The quaternary additives include vinylene carbonate (VC) between 0.5-2% by weight, trimethylsilyl (TMSi) between 0.25-1% by weight, bis(2,2,2-trifluoroethyl) carbonate (DFDEC) between 0.5-2% by weight, and succinic anhydride (SA) between 0.25-1% by weight.

This invention discloses a method for synthesizing vinylene carbonate. The method includes: reacting chlorovinyl carbonate with triethylamine in the presence of compounds such as oxanthracene or thioxanthracene to generate a vinylene carbonate reaction solution; and then subjecting the reaction solution to vacuum filtration, distillation, and crystallization to obtain electronically pure vinylene carbonate (purity can reach 99.995% or higher). This method can effectively inhibit the polymerization of vinylene carbonate, avoid the formation of vinylene carbonate polymers, improve the yield of the elimination reaction and the overall heat transfer efficiency of the distillation process, reduce the difficulty of separation and purification, and reduce energy consumption, making it suitable for industrial production.

This invention relates to the field of battery technology, and more particularly to a non-aqueous electrolyte, a lithium-ion battery, a battery module, a battery pack, and an electrical device. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent, and functional additives. The functional additives include compounds with the structure shown in Formula I and other additives; R1 and R2 are each independently selected from carbonyl, amide, and dimethylacetamide groups; R3, R4, R5, and R6 are each independently selected from hydrogen and fluorine; n is selected from 1 to 3; other additives are selected from one or more combinations of lithium difluorosulfonylimide, lithium trifluoromethanesulfonate, lithium fluorosulfonate, 2-propynyl methanesulfonate, methanedisulfonate methylene, fluoroethylene carbonate, spiroethylene sulfate, vinylene carbonate, and 1,3-propanesulfonate lactone. This invention, through the synergistic effect of compounds with the structure shown in Formula I and other additives, improves the low-temperature performance, rate performance, and cycle performance of lithium batteries.

Herein discussed is an electrochemical device comprising: an anode, a cathode, and an electrolyte; wherein the anode does not comprise pure alkali metals; and wherein the electrolyte comprises a solvent comprising at least 0.2wt% of a cyclic carbonate based on total solvent weight and at least 10wt% of N,N-dimethylsulfamoylfluoride (DMSF) or 1,1,1-trifluoro-N,N-dimethylmethanesulfonamide (DMTMSA) or mixture thereof based on total solvent weight; wherein the solvent comprises a lithium salt or a sodium salt or combination thereof substantially dissolved in the solvent at a concentration of no more than 2.5 molality, wherein molality is moles of solute divided by weight of solvent in kg; wherein the electrolyte has an ionic conductivity of no greater than 12 mS / cm at room temperature. In an embodiment, the cyclic carbonate comprises ethylene carbonate (EC), fluoroethylene carbonate (FEC), vinylene carbonate (VC), or combinations thereof.

A compound of formula (I) wherein R1 is H or methyl, R2 and R3 are independently selected from H, C1-C4 alkyl, cycloalkyl and phenyl-C1- C4-alkyl, or R2 and R3, together with the carbon atom to which they are attached, form a C3-C6 carbocycle, R4 is H or C1-C4 alkyl, and A is C2-C7-alkylene is a suitable precursor for polyisocyanate-adducts and crosslinkers for obtaining isocyanate-free urethane-type polymers.

A composite solid electrolyte and its preparation method, and a secondary battery thereof, are disclosed. The preparation method of the composite solid electrolyte includes: coating a composite slurry comprising a polymer matrix material, vinylene carbonate monomer, initiator, inorganic filler, and lithium salt into a film to obtain a membrane; applying ultrasound to the membrane and activating the initiator by heat to induce in-situ polymerization of the vinylene carbonate monomer to generate polyvinyl carbonate, thereby preparing a composite solid electrolyte membrane; and subjecting the composite solid electrolyte membrane to hot pressing treatment to obtain the composite solid electrolyte. This application achieves precise control of the multiphase structure of the composite solid electrolyte by combining ultrasound and hot pressing treatment, thereby improving the ion conductivity and mechanical strength of the obtained composite solid electrolyte and giving it a wider electrochemical stability window.

The present application relates to the technical field of organic synthesis, in particular to a kind of double imidazole guanidine functionalized organic tertiary phosphine compound and its preparation method and application and a kind of preparation method of vinylene carbonate.The structural formula of double imidazole guanidine functionalized organic tertiary phosphine compound provided by the present application is: R is selected from C1-C6 aliphatic alkyl, C3-C8 cycloalkyl or C6-C9 aromatic group.The double imidazole guanidine functionalized organic tertiary phosphine compound provided by the present application has strong acid binding effect, is used for the preparation of vinylene carbonate, has the advantages of low reaction temperature, short reaction time, high conversion rate and yield, and the product is easy to purify.

The application relates to a sodium ion battery wide-temperature electrolyte and a preparation method and application thereof, relates to the technical field of battery electrolytes, and solves the core problems of poor wide-temperature domain adaptability, low low-temperature ion conductivity and insufficient cycle stability of existing sodium ion battery electrolytes. The electrolyte comprises a sodium salt, a composite organic solvent and a functional additive; the composite organic solvent is a mixture of ethylene carbonate, methyl ethyl carbonate and methyl propionate; the functional additive is a mixture of vinylene carbonate and sodium difluoro oxalate borate; in an argon glove box with water oxygen content of less than or equal to 0.1 ppm, ethylene carbonate, methyl ethyl carbonate and methyl propionate are added into a preparation container, and are uniformly stirred at room temperature to obtain the composite organic solvent; sodium hexafluorophosphate is added in batches, and is stirred until completely dissolved to obtain a basic electrolyte; the functional additive is added into the basic electrolyte, and is uniformly stirred at room temperature to obtain the wide-temperature electrolyte. The application can meet the application requirements in the fields of extreme environment special power sources and the like.

Provided is an electrolyte, comprising a lithium salt, an organic solvent, and an additive, wherein the additive comprises a first additive, vinylene carbonate, and lithium tetrafluoroborate; the first additive is selected from a compound represented by formula 1, wherein R1, R2, and R3 are each independently selected from C1-C10 alkyl or C3-C10 cycloalkyl, and R4 is selected from C2-C5 alkenyl or C2-C5 alkynyl.

The application provides a secondary liquid injection electrolyte, a lithium ion battery and a preparation method thereof, and relates to the technical field of lithium ion batteries. The secondary liquid injection electrolyte comprises a first liquid injection electrolyte and a second liquid injection electrolyte, wherein the first liquid injection electrolyte is used for first liquid injection, and the second liquid injection electrolyte is used for second liquid injection; the first liquid injection electrolyte comprises a first lithium salt, a first solvent and a first additive, the first solvent comprises a cyclic carbonate, and the first additive at least comprises vinylene carbonate VC; the second liquid injection electrolyte comprises a second lithium salt, a second solvent and a second additive, the second solvent comprises a cyclic carbonate, and the second additive at least comprises vinylene carbonate VC; wherein the content of the first lithium salt is greater than the content of the second lithium salt; the volume ratio of the cyclic carbonate in the first solvent is less than the volume ratio of the cyclic carbonate in the second solvent; and the content of the first additive is less than the content of the second additive. The problem of early attenuation of LFP batteries is solved.

This invention relates to a dual-salt flame-retardant gel polymer electrolyte, its in-situ preparation method, and a battery. The dual-salt flame-retardant gel polymer electrolyte comprises: a three-dimensional cross-linked gel network matrix, and a flame-retardant plasticizer and a dual-salt system uniformly dispersed in the voids of the three-dimensional cross-linked gel network matrix. The gel polymer electrolyte is formed in situ by injecting a precursor solution into a battery casing, allowing it to stand under vacuum, and then subjecting it to heat treatment. The precursor solution comprises: a free radical initiator, a vinylene carbonate monomer, a flame-retardant plasticizer, and a dual-salt system. The three-dimensional cross-linked gel network matrix is ​​a polyvinyl carbonate polymer matrix. The polyvinyl carbonate polymer matrix is ​​formed by the free radical polymerization of the vinylene carbonate monomer initiated by a free radical initiator. The dual-salt system comprises a first metal salt and a second metal salt. Batteries using the dual-salt flame-retardant gel polymer electrolyte of this invention exhibit good electrochemical performance.

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.

The application relates to the technical field of batteries, in particular to a lithium ion battery. The lithium ion battery comprises a negative electrode sheet and an electrolyte; the negative electrode sheet comprises silicon-carbon material, and the sphericity of the silicon-carbon material is 0.6-1; the electrolyte comprises lithium salt and organic matter, the organic matter comprises carbonate and sulfur-containing substances; the carbonate comprises fluoroethylene carbonate and vinylene carbonate; the sulfur-containing substances comprise fluorosulfamide compounds and 1,3-propane sulfonic acid lactone; the sulfur-containing substances further comprise at least one of erythritol sulfate, pentaerythritol sulfate and mannitol carbonate sulfate; the mass content of the sulfur-containing substances in the organic matter is 6%-20%; the mass content of the fluorosulfamide compounds in the sulfur-containing substances is 50%-95%; and the mass content of the 1,3-propane sulfonic acid lactone in the organic matter is C5<=1.5%. The lithium ion battery has long cycle stability and good rate discharge performance.

The application discloses a filling material and a preparation method thereof, a negative electrode sheet, a battery and a preparation method thereof. The filling material is used for the negative electrode sheet. The filling material comprises a shell layer and a core. The shell layer wraps the core. The core comprises vinylene carbonate. The shell layer comprises polyurethane acrylate. The shell layer is a cross-linked structure. After the shell layer of the filling material is broken by heating, the vinylene carbonate of the core can be dissolved by an electrolyte, and then a pore is formed in the negative electrode sheet. The diffusion path of lithium ions can be shortened, the kinetic performance of the negative electrode sheet is improved, the volume energy density of an energy storage system and the battery is improved, and the vinylene carbonate can be released in situ and concentrated around the negative active material particles. A high-quality SEI film which is more compact, more uniform and richer in LiF is formed during the first formation.

The invention provides an electrolyte. The electrolyte comprises a lithium salt, an organic solvent and an additive, the additives comprise a first additive, vinylene carbonate and lithium tetrafluoroborate; the first additive is selected from a compound shown in a formula 1; wherein R1, R2 and R3 are respectively and independently selected from C1-C10 alkyl groups or C3-C10 cycloalkyl groups, and R4 is selected from C2-C5 alkenyl groups or C2-C5 alkynyl groups. Through the synergistic effect of the first additive, vinylene carbonate and lithium tetrafluoroborate, the cycle performance and high-temperature storage performance of the secondary battery can be improved.

A nonaqueous electrolyte secondary battery includes a positive electrode capable of occluding and releasing lithium, a negative electrode including a negative electrode current collector and a negative electrode active material, and an electrolyte solution including a solvent. In the nonaqueous electrolyte secondary battery, the negative electrode active material includes metal zinc or an alloy of metal zinc. The solvent is composed only of vinylene carbonate.

The invention discloses a battery monomer and electric equipment. The battery monomer comprises a positive pole piece, a negative pole piece, an isolating membrane and electrolyte, the electrolyte comprises a lithium salt, a solvent and an additive, the solvent comprises carboxylic ester; the additive comprises vinylene carbonate, fluorine-containing anhydride and derivatives thereof; and the mass percent a of the carboxylic ester in the electrolyte is more than or equal to 10% and less than or equal to 80%. Carboxylic ester, vinylene carbonate, fluorine-containing anhydride and derivatives thereof in the electrolyte are matched with one another, so that the cycle life of the battery monomer is prolonged, and meanwhile, the battery monomer is kept to have relatively good quick charge performance.

The application provides a lithium ion battery, which comprises a positive electrode sheet and an electrolyte; the positive electrode sheet comprises a positive electrode active material lithium iron phosphate; the electrolyte comprises an additive a and an additive b; the additive a comprises vinylene carbonate; and the additive b comprises a compound with a structure shown in formula (I) and a compound with a structure shown in formula (II). The two additives are used in combination, partially replace VC, reduce the addition amount of VC, and compared with the SEI formed by the reduction of VC, the SEI structure formed by the compound with the structure shown in formula (I) and the compound with the structure shown in formula (II) is more compact, the inhibition effect of the interface side reaction is stronger, and the effect of improving high-temperature cycle is better compared with VC.

The application discloses a high-capacity and high-safety cylindrical lithium ion battery and a preparation method thereof. The lithium ion battery is of a 21700 specification and comprises a positive electrode, a negative electrode, a diaphragm, an electrolyte and a steel shell. The positive electrode active material of the positive electrode is an ultrahigh-nickel ternary material LiNi(x)Co(y)Mn(z)O(2), wherein x is greater than or equal to 0.9, x+y+z is equal to 1, and the specific capacity is greater than or equal to 220 mAh / g. The specific surface coating and doping modification treatment are specifically a gas phase deposition inorganic layer surface coating technology and a precursor cation doping. The negative electrode active material is a high-specific-capacity silicon-carbon composite material, wherein the mass ratio of the silicon-based material is 5% to 15%, and the first discharge specific capacity is greater than or equal to 700 mAh / g. The diaphragm is a composite ceramic coated diaphragm, the base film is a single-layer or multi-layer polyolefin microporous film, and the ceramic coating layer comprises alumina or silicon oxide particles. The electrolyte comprises specific combinations of functional additives, including but not limited to: vinylene carbonate, fluoroethylene carbonate, 1,3-propane sulfone lactone and phosphorus-containing and fluorine-containing flame-retardant additives.

The present invention provides a lithium secondary battery including a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material, the positive electrode active material includes lithium iron phosphate particles, the loading amount of the positive electrode is 450 mg / 25 cm 2 to 740 mg / 25 cm 2 , the non-aqueous electrolyte includes a lithium salt, an organic solvent, and an additive, wherein the organic solvent includes 10 to 35% by volume of ethylene carbonate, 5 to 55% by volume of dimethyl carbonate, and 20 to 70% by volume of ethyl methyl carbonate, and the volume ratio of the cyclic carbonate-based solvent to the linear carbonate-based solvent is 10:90 to 35:65, the additive includes vinylene carbonate, and the weight ratio of the vinylene carbonate to the dimethyl carbonate is greater than 0 to 0.2 or less. By improving the negative electrode reduction stability while improving the impregnation properties of the positive electrode to the non-aqueous electrolyte, the lithium secondary battery has excellent capacity performance effects, excellent life performance, and resistance reduction effects.

The application relates to an electrolyte, a lithium ion battery and application thereof. The electrolyte comprises a first additive, a second additive and a third additive, the first additive comprises vinylene carbonate, the second additive comprises 3-(trimethylsilyl)-2-oxazolidinone, and the third additive comprises 1,3,5-triacryloylhexahydro-1,3,5-triazine; the mass percentage of the vinylene carbonate is 1-15% in the total mass of the electrolyte, the mass percentage of the 3-(trimethylsilyl)-2-oxazolidinone is 0.5-5%, and the mass percentage of the 1,3,5-triacryloylhexahydro-1,3,5-triazine is 0.5-2.5%. In the scheme, the three functional additives synergistically act, can effectively inhibit the catalytic side reaction caused by the dissolution of manganese ions, effectively buffer the volume expansion of the silicon negative electrode, and improve the high and low temperature cycle stability of the lithium ion battery.

The present invention provides a lithium secondary battery including a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material, the positive electrode active material includes lithium iron phosphate particles, the loading amount of the positive electrode is 450 mg / 25 cm 2 to 740 mg / 25 cm 2 , the non-aqueous electrolyte includes a lithium salt, an organic solvent, and an additive, wherein the organic solvent includes a cyclic carbonate-based solvent and a linear carbonate-based solvent, the linear carbonate-based solvent includes dimethyl carbonate, the content of dimethyl carbonate in the organic solvent is 5% by volume to 75% by volume, the additive contains vinylene carbonate, and the weight ratio of vinylene carbonate to dimethyl carbonate is 0.01 to 0.2. By improving the impregnation properties of the positive electrode to the non-aqueous electrolyte while improving the negative electrode reduction stability, the lithium secondary battery has excellent capacity performance, excellent life performance, and resistance reduction effect.

The present disclosure provides an electrolyte comprising: an electrolyte comprising: (a) a primary lithium salt; (b) a secondary lithium salt; and (c) an additive; wherein the primary lithium salt is lithium hexafluorophosphate (LiPFe); the primary lithium salt and the secondary lithium salt are in a mole ratio range of 4:1 to 6:1; and the additive is selected from vinylene carbonate, propane sultone, lithium difluoro(oxalato)borate (LiDFOB), 1,3,6 hexanetricarbonitrile (HTCN), or combinations thereof. The present disclosure further provides an electrochemical cell comprising the electrolyte as disclosed herein.

This invention provides a lithium-ion battery and an electrical device thereof. The lithium-ion battery includes at least an electrolyte, a separator, and a negative electrode. The electrolyte includes additives, including vinylene carbonate and / or fluoroethylene carbonate. The electrolyte, separator, and negative electrode satisfy the following relationship: 1.25 × 10⁻⁶ ‑3 ≤(a×b) / c≤0.4. The lithium-ion battery provided by this invention achieves a comprehensive improvement in the cycle performance and rate performance of the lithium-ion battery by comprehensively controlling the total mass percentage of additives in the electrolyte (a), the liquid absorption thickness change rate of the separator (b), and the rebound rate of the negative electrode (c).

The application relates to a lithium ion battery and an electric device, the lithium ion battery comprising an electrolyte, a negative electrode and a positive electrode, the electrolyte comprising a first additive, a second additive and a third additive; wherein the first additive is a sulfur ring compound, the second additive is vinylene carbonate, and the third additive is a nitrile compound; the negative electrode active material in the negative electrode comprises a silicon material; wherein the following relationship is satisfied among the first additive, the second additive, the third additive and the silicon material: 3 <= a / c + 100b / d < 7, wherein a is the mass fraction of the first additive in the electrolyte; b is the mass fraction of the second additive in the electrolyte; c is the mass fraction of the third additive in the electrolyte; and d is the mass fraction of the silicon material in the negative electrode active material. The scheme provided by the application can maintain the energy density of the battery, improve the high-temperature and high-pressure cycle performance of the battery, inhibit the expansion of the thickness, and simultaneously consider the low-temperature discharge performance of the battery.