1251 results about "Carboxylic ester" 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 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 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 and a negative pole piece, the positive pole piece comprises a positive current collector and a positive film layer, the positive film layer comprises a positive active material, the positive active material comprises lithium-containing phosphate of an olivine structure, and the electrolyte is a lithium-containing lithium-containing phosphate of a lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing electrolyte. The resistance of the positive pole piece is 0.1 ohm to 30 ohm, the negative pole piece comprises a negative current collector and a negative film layer, the resistance of the negative pole piece is 0.001 ohm to 0.01 ohm, the electrolyte comprises an organic solvent, the organic solvent comprises a chain ester solvent, and the mass content of the chain ester solvent in the organic solvent is 5% to 75%; the conductivity of the electrolyte at room temperature is 13 mS / cm to 20 mS / cm. The heat production amount of the battery monomer can be reduced, and the use reliability and the cycle performance of the battery monomer can be improved.

The invention provides 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 first pole piece and a second pole piece, each of the first pole piece and the second pole piece comprises a coating part and a tab, the coating part is coated with an active material layer, and the tab is not coated with the active material layer; one of the first pole piece and the second pole piece is a positive pole piece, and a positive active material of the positive pole piece comprises lithium-containing phosphate with an olivine structure; the coating part of the first pole piece comprises a first straight section, the coating part of the second pole piece comprises a second straight section, the first straight section and the second straight section are stacked in the thickness direction of the electrode assembly, and the ratio of the number of the tabs of the first pole piece to the number of the first straight sections of the first pole piece is 0.5-2; an organic solvent of the electrolyte comprises a chain carboxylic ester solvent, and the mass content of the chain carboxylic ester solvent in the organic solvent is 8-90%. The use reliability and the cycle performance of the battery monomer can be improved.

Provided in the present application are a lithium secondary battery and an electric device. The lithium secondary battery comprises an electrolyte and a negative electrode sheet, wherein the electrolyte comprises a chain carboxylic ester and a cyclic carbonate, and the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer located on at least one side of the negative electrode current collector. Based on the total mass of the electrolyte, the mass content W1 of the chain carboxylic ester and the mass content W2 of the cyclic carbonate satisfy: 0.1≤W2 / W1≤2, and the mass content W1 of the chain carboxylic ester and the thickness H of the negative electrode film layer satisfy: 0.2≤H / 100W1≤20, with the unit of H being μm. The lithium secondary battery has good fast charging performance and cycling performance.

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, wherein the electrode assembly comprises a positive plate, a negative plate and a non-aqueous electrolyte; the positive plate comprises a positive current collector and a positive film layer, and the negative plate comprises a negative current collector and a negative film layer; the positive electrode film layer comprises a positive electrode active material, and the positive electrode active material comprises a lithium manganese iron phosphate material and a nickel cobalt lithium manganate material; in the nickel cobalt lithium manganate material, the molar ratio of Ni in the sum of the three elements of Ni, Co and Mn is 0.5-0.95; the non-aqueous electrolyte comprises vinylene carbonate, and the mass content of the vinylene carbonate in the non-aqueous electrolyte is 0.5%-2%; the non-aqueous electrolyte comprises at least one of linear carbonic ester and linear carboxylic ester, and the conductivity of the non-aqueous electrolyte is 9-14 mS / cm. The energy density, the cycle performance and the power performance of the battery monomer are improved at the same time.

The invention discloses a tetranuclear ladder type organic tin carboxylate complex as well as a preparation method and application thereof, and belongs to the technical field of metal complexes, the tetranuclear ladder type organic tin carboxylate complex is prepared by taking para-position or ortho-position substituted benzoic acid as a ligand and taking organic tin dimethyl tin oxide as a substrate. The preparation method is simple to operate and mild in condition. The tetranuclear ladder type organic tin carboxylate complex can be used as a photocatalyst for photocatalytic production of H2O2, and the photocatalytic H2O2 production rate is as high as 5.12 * 10 < 3 > [mu] mol.g <-1 >. H <-1 > and is higher than the H2O2 production rate of a photocatalyst reported in the existing literature.

Herein is provided a novel process for the preparation of methyl 6-(2,4-dichlorophenyl)-5-[4-[(3S)-1-(3-fluoropropyl)pyrrolidin-3-yl]oxyphenyl]-8,9-dihydro-7H-benzo[7]annulene-2-carboxylate by a Suzuki coupling of compound (3), wherein LG represents a leaving group, with an organoboron reagent:Compound (3) is obtained by activation of compound (4) with a leaving group LG, and compound (4) is obtained by alpha-arylation of methyl 5-oxo-6,7,8,9-tetrahydro-5H-benzo[7]annulene-2-carboxylate with 1-LG′-2,4-dichlorobenzene, wherein LG′ represents a leaving group:

The invention relates to the technical field of lithium batteries, and provides a lithium ion secondary battery. The battery comprises a positive plate, a negative plate and electrolyte, the positive plate comprises lithium iron phosphate particles, and the Dv50 of the lithium iron phosphate particles is 5-15 [mu] m; the electrolyte comprises an organic solvent, and the organic solvent comprises a linear organic solvent and an annular organic solvent; the linear organic solvent comprises linear carbonic ester and linear carboxylic ester, and the cyclic organic solvent comprises cyclic carbonic ester; based on the total mass of the electrolyte, the mass ratio of the cyclic carbonate is recorded as S1, the mass ratio of the linear carbonate is recorded as S2, and the mass ratio of the linear carboxylic ester is recorded as S3; s = (S2 + S3) / S1; s satisfies 1.5 < = S < = 20; the electrolyte comprises lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate; the mass ratio of the lithium bis (fluorosulfonyl) imide to the lithium hexafluorophosphate is recorded as L, Lgt; 1. The battery provided by the invention has relatively good low-temperature discharge performance and high-temperature cycle performance.

The invention discloses a battery monomer, a battery device and electric equipment, and belongs to the technical field of batteries. The battery monomer comprises a positive pole piece, the positive pole piece comprises a positive active material, and the positive active material comprises lithium-containing phosphate and lithium-containing transition metal oxide; the electrolyte comprises a carboxylic ester solvent, and based on the total mass of the electrolyte, the mass content A of the carboxylic ester solvent meets the condition that A is larger than or equal to 20 wt% and smaller than or equal to 80 wt%. The battery monomer provided by the invention has relatively high energy density, relatively high reliability and relatively good dynamic performance.

Disclosed are naphthyl compounds comprising either a ureido piperidine-1 -carboxamide or a ureido piperidine-1 -carboxylate moiety, compositions thereof, and methods of use thereof, for treating or preventing a disease or disorder associated with abnormal levels of amino acids by modulation of SLC6A19 transport, such as phenylketonuria, hyperphenylalaninemia, diabetes and chronic kidney disease.

The invention relates to a full-temperature-range polymer-based solid electrolyte, a solid-state battery and a preparation method. Mixing alkali metal salt, a polymer monomer and a plasticizer to obtain an electrolyte precursor; the polymer monomer comprises a fluorinated acrylate compound; the plasticizer comprises a fluorinated carboxylic ester compound, a fluorinated carbonic ester compound or a fluorinated amide compound; and adding an initiator into the electrolyte precursor, heating and polymerizing to obtain the polymer-based solid electrolyte with the polar functional group forming the dipole group, namely the full-temperature-range polymer-based solid electrolyte. A polymer monomer with a soft long side chain is used, and plasticizer molecules are anchored between polymer chains, so that leakage of the plasticizer molecules and parasitic reaction between the plasticizer molecules and an electrode are reduced, and the interface stability of the electrolyte in a high-temperature environment is improved; a polar functional group in the solid electrolyte has relatively high electronegativity, and the formed dipole interacts with alkali metal ions, so that the ions are quickly decoupled from a polymer matrix, and the low-temperature conductivity is favorably improved.

The invention relates to a lithium ion secondary battery, a preparation method and an electric device. The lithium ion secondary battery comprises a positive pole piece, a negative pole piece and electrolyte, wherein an isolating membrane is arranged between the positive pole piece and the negative pole piece; the electrolyte comprises electrolyte salt, a non-aqueous solvent and an additive; the non-aqueous solvent comprises a chain carboxylic ester compound, the chain carboxylic ester compound comprises a formula I solvent with a structural formula of R11-C (= O)-O-R12, and R11 and R12 are respectively and independently methyl or ethyl; the additives comprise a first additive and a second additive, the first additive is a non-ionic organic additive containing carbon-carbon triple bonds, and the second additive is a negative electrode film-forming additive different from the first additive. The lithium ion secondary battery has excellent fast charging performance.

The invention discloses an electrolyte adaptive to a lithium iron manganese phosphate positive electrode material and a battery, and belongs to the technical field of batteries. The electrolyte comprises a non-aqueous solvent, a lithium salt and a negative electrode film-forming additive, the mass ratio a of the total mass of the dimethyl carbonate and the carboxylic ester in the non-aqueous solvent, the molar ratio b of the lithium bis (fluorosulfonyl) imide in the lithium salt, the molar ratio y of manganese in the lithium manganese iron phosphate and the compaction density c of the positive pole piece meet the relational expression: # imgabs0 # 0.01 < = a < = 1; 0.01 < = b < = 1; 1.8 < = c < = 2.7 in g / cm < 3 >; the molecular formula of the lithium manganese iron phosphate is LixMnyFe1-yPO4, x is more than or equal to 0.95 and less than or equal to 1.05, and y is more than or equal to 0.3 and less than or equal to 0.8; and the mass ratio d and y of the negative electrode film-forming additive in the electrolyte meet the relational expression that (100 * d) / y is greater than or equal to 3 and less than or equal to 20, and d is greater than or equal to 0.001 and less than or equal to 0.2. The electrolyte can improve the deposition phenomenon of manganese ions on a negative electrode and improve the conductivity and the dynamic performance.

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 an electrolyte, an electrochemical device comprising the electrolyte and a vehicle. The electrolyte comprises a solvent, a first additive and a second additive, the solvent comprises chain carboxylic ester, and the first additive comprises a sulfonate compound or / and a sulfate compound; the second additive comprises vinylene carbonate or / and fluoroethylene carbonate. According to the electrolyte disclosed by the invention, the chain carboxylic ester solvent, the first additive containing the sulfonate compound or / and the sulfate compound and the second additive containing the vinylene carbonate or / and the fluoroethylene carbonate are matched for use; the rapid charging capability and the high-temperature cycle performance of a lithium iron phosphate system battery with high safety performance can be improved, and the application of lithium iron phosphate in a power battery is further widened.

The invention relates to a lithium battery low-temperature electrolyte and a lithium ion battery, and belongs to the technical field of lithium batteries. Comprising the following steps: reducing the mass concentration (llt of conventional lithium salt by introducing a cosolvent; 13.5%), a synergistic positive / negative electrode film-forming additive, a low-impedance lithium salt additive and a functional additive. According to the invention, common low-melting-point and low-viscosity carboxylic ester is selected as a cosolvent, and the concentration of the lithium salt is reduced, so that the viscosity of the electrolyte at a low temperature is reduced, and the ionic conductivity is improved; a stable low-impedance positive / negative electrode interface film is constructed by cooperating with conventional positive / negative electrode film-forming additives such as vinylene carbonate and fluoroethylene carbonate, and the solvation structure of the electrolyte is regulated and controlled by introducing lithium salt additive anions, so that the desolvation process of lithium ions at low temperature is promoted, the low-temperature performance of the lithium battery is improved, and the service life of the lithium battery is prolonged. And the long cycle life of the electrolyte at normal temperature can also be ensured.

The invention relates to the technical field of lithium batteries, and provides a lithium ion secondary battery. The battery comprises a positive plate, a diaphragm and a negative plate which are laminated, the positive plate comprises lithium iron phosphate; the diaphragm is formed by a base film; the battery also comprises an electrolyte; the electrolyte comprises lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate; based on the total mass of the electrolyte, the mass ratio of the lithium bis (fluorosulfonyl) imide is recorded as L2, and the mass ratio of the lithium hexafluorophosphate is recorded as L1; l2 and L1 satisfy the following conditions: 0.1 < = L2 / L1 < = 4.6; the electrolyte comprises a linear organic solvent and an annular organic solvent; the linear organic solvent comprises linear carbonic ester and linear carboxylic ester, and the cyclic organic solvent comprises cyclic carbonic ester; the mass ratio of the linear organic solvent to the annular organic solvent is marked as W, and W is greater than or equal to 1; when the conditions are met, the high and low temperature performance and the safety performance of the battery can be effectively improved.

The invention discloses a battery monomer, a battery device and electric equipment, 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 current collector and a positive active material layer arranged on at least one side of the positive current collector, and the positive active material layer comprises lithium-containing phosphate; the electrolyte comprises a carboxylic ester solvent and a linear carbonic ester solvent, based on the total mass of the electrolyte, the mass ratio of the carboxylic ester solvent is 5%-25%, and the mass ratio of the linear carbonic ester solvent is 20%-49%; the electrolyte further comprises a non-lithium salt additive, the non-lithium salt additive comprises a phosphate ester additive, and the non-lithium salt additive further comprises at least one of a carbonate ester additive, a sulfate ester additive, a borate ester additive, a silane additive and a sultone additive. The total mass of the non-lithium salt additive accounts for 0.1%-5%.

The embodiment of the invention provides a sodium-ion battery and electric equipment, the sodium-ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the electrolyte comprises a cyclic carbonate solvent and / or a carboxylic ester solvent; the ratio of the mass ratio of the cyclic carbonate solvent in the electrolyte to the sum of the D50 particle size of the positive electrode active material and the D50 particle size of the negative electrode active material is (0.005: 1)-(0.2: 1); the ratio of the mass ratio of the carboxylic ester solvent in the electrolyte to the sum of the D50 particle size of the positive electrode active material and the D50 particle size of the negative electrode active material is 0.002: 1 to 0.1: 1; wherein the unit of the D50 particle size is [mu] m. According to the sodium-ion battery, by reasonably designing the specific incidence relation between the D50 particle size of the positive and negative electrode active materials and the electrolyte solvent, the ion transmission and ion diffusion capability in the charging and discharging process of the battery can be effectively balanced, the low-temperature dynamic performance of the battery is improved, and meanwhile, the high-temperature performance is considered.

The invention discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly and an electrolyte; wherein the electrode assembly comprises a positive electrode plate and a negative electrode plate, a positive electrode film layer of the positive electrode plate comprises a positive electrode active material, the positive electrode active material comprises lithium-containing phosphate, and the porosity of the positive electrode plate is 20-30%; a negative electrode film layer of the negative electrode plate comprises a negative electrode active material, the negative electrode active material comprises graphite, and the porosity of the negative electrode plate is 24-33%; the electrolyte comprises an electrolyte salt and a solvent, the solvent comprises chain carboxylic ester and chain carbonic ester, the mass ratio of the chain carboxylic ester in the electrolyte is 8.5%-40%, and the mass ratio of the chain carbonic ester in the electrolyte is 8.5%-50%. According to the technical scheme, good fast charging performance, good cycle performance and high energy density of the battery are considered.

The invention discloses an insect-repelling environment-friendly sand-containing fog sealing layer and a preparation method thereof. The insect-repelling environment-friendly sand-containing fog sealing layer comprises the following components in parts by mass: 35-70 parts of asphalt; 30 to 70 parts of water; 2-8 parts of a composite emulsifier; 0.5 to 3 parts of a defoaming agent; 5 to 30 parts of acrylic ester; 0.1 to 1 part of a photoinitiator; 20 to 40 parts of a suspending agent; 20 to 45 parts of fine sand particles; 5 to 40 parts of insect-repelling environment-friendly microcapsules; a shell material of the insect-repelling environment-friendly microcapsule is a composite shell material containing silicon dioxide / nano tourmaline, and a core material of the insect-repelling environment-friendly microcapsule comprises one or more of a pyrethroid compound, a carboxylic ester compound, an amide compound and a plant extract; a metal chelate is loaded on the surface of the shell material. The insect-repelling environment-friendly sand-containing fog sealing layer has good pavement performance and insect-repelling performance, and can effectively inhibit the amount of pollutants generated when an asphalt pavement is exposed to high temperature and solarization.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly, a first heat insulation part and an electrolyte, the electrode assembly comprises a positive pole piece, an isolation membrane and a negative pole piece, the positive pole piece comprises a positive active material layer, and the negative pole piece comprises a negative active material layer; the positive electrode active material layer comprises lithium-containing phosphate with an olivine structure and a positive electrode conductive agent, and the mass content of the positive electrode conductive agent is 0.5-1.2%; the electrolyte comprises a carboxylic ester solvent, a silane-based additive and an unsaturated ester additive, the mass content of the carboxylic ester solvent in the electrolyte is 8%-30%, and the mass content of the silane-based additive in the electrolyte is 0.05%-1%; the mass content of the unsaturated ester additive in the electrolyte is 0.05%-3%, and the first heat insulation part is located between the first area and the main body part and at least covers the first area. According to the invention, rapid charging and use reliability of the single battery can be considered.

The invention provides a single battery, a battery device and a power utilization device, the single battery comprises an electrode assembly, the total width of a positive pole lug part accounts for 50%-100% of the total size of a pole lug connecting edge along the extension direction of the pole lug connecting edge of a positive pole main body part, and the total width of a negative pole lug part accounts for 50%-100% of the total size of the pole lug connecting edge along the extension direction of the pole lug connecting edge of a negative pole main body part; wherein the coating weight of the single negative electrode active material layer is 0.1 g / 1540.25 mm < 2 >-0.145 g / 1540.25 mm < 2 >, the electrolyte comprises at least one of dimethyl carbonate and linear carboxylic ester, the structural formula of the linear carboxylic ester meets R1-COO-R2, and R1 and R2 are independently selected from C1-C5 alkyl or halogenated alkyl respectively; based on the total mass of the organic solvent, the mass fraction of the first solvent is 4-72%.

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, an isolating membrane and a negative pole piece, the positive pole piece comprises a positive current collector and a positive active material layer arranged on at least one side of the positive current collector, the negative electrode piece comprises a negative electrode current collector and a negative electrode active material layer arranged on at least one side of the negative electrode current collector, the positive electrode active material layer comprises lithium-containing phosphate with an olivine structure, the electrolyte comprises a carboxylic ester solvent, fluorine-containing lithium sulfimide, lithium fluorosulfonate and phosphorus oxyfluoride, the mass content of the carboxylic ester solvent in the electrolyte is 8-30%, and the mass content of the fluorine-containing lithium sulfimide in the electrolyte is 10-30%. The mass content of the fluorine-containing lithium sulfimide in the electrolyte is 3%-8%, the mass content of the lithium fluorosulfonate in the electrolyte is 0.05%-0.5%, and the mass content of the phosphorus oxyfluoride in the electrolyte is 0.05%-0.5%. According to the invention, rapid charging and use reliability of the single battery can be considered.

The invention discloses an electrolyte and a lithium ion battery, the electrolyte comprises a solvent and an additive, the solvent comprises carboxylic ester; the additive comprises a benzenesulfonyl isocyanate compound, the benzenesulfonyl isocyanate compound meets the formula 1: # imgabs0 #, and R1, R2, R3, R4 and R5 are respectively and independently selected from any one of H, F, Cl, Br, methyl, ethyl, propyl, butyl, amyl and hexyl. The electrolyte provided by the invention is beneficial to improving the fast charging performance of the lithium ion battery, and the lithium ion battery has relatively good fast charging performance and cycle performance.

A secondary battery and an electric device. The secondary battery comprises an electrode assembly and an electrolyte, wherein the electrode assembly comprises a positive electrode sheet, a negative electrode sheet and a separator; the positive electrode sheet comprises a positive-electrode active material layer, and the positive-electrode active material layer comprises a positive-electrode active material; the negative electrode sheet comprises a negative-electrode active material layer, and the negative-electrode active material layer comprises a negative-electrode active material; the coating weight of the positive-electrode active material layer is Wz, the coating weight of the negative-electrode active material layer is Wf, and Wz and Wf satisfy: 1.6Wf≤Wz≤2.2Wf, and 3.25 mg / cm2≤Wf≤5.84 mg / cm2; the Dv99 of the positive-electrode active material is 27 μm to 33 μm, and the Dv99 of the negative-electrode active material is 23 μm to 28 μm; and the electrolyte comprises an organic solvent, a lithium salt and a nitrile additive, the organic solvent comprises a chain carboxylic ester, and based on the mass of the electrolyte, the mass percentage content of the chain carboxylic ester is 6% to 56% and the mass percentage content of the nitrile additive is 0.01% to 10%. The secondary battery has good dynamic performance during cycling and good high-temperature stability.

The invention discloses an electrolyte and a battery. The electrolyte comprises a solvent, a lithium salt and an additive, the solvent comprises acetonitrile and carboxylic ester, the additive comprises a first additive, a second additive and a third additive, the first additive is at least one of phosphate, borate, fluorophosphate and fluoborate with a film-forming potential of 1.3-2V, and the third additive is at least one of lithium salt and fluoborate with a film-forming potential of 1.3-2V. The second additive is at least one of a sulfur-containing additive, a boron-containing additive and a phosphorus-containing additive, and the third additive is a negative electrode film-forming additive; and Y is more than 0.025 and less than 60. According to the invention, a solvent system and an interface film forming mechanism of the electrolyte are synergistically regulated and controlled, so that the core problem of violent side reaction between the acetonitrile-based electrolyte and the negative electrode is solved, and meanwhile, the combination of high energy density and ultrafast charging performance is realized. The electrolyte is suitable for high-energy-density, wide-temperature-range and fast-charging type lithium iron phosphate batteries.

The invention relates to a secondary battery and an electric device. The secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the negative pole piece comprises a negative active layer, the negative active layer comprises a negative active material and a binder, and the binder comprises polytetrafluoroethylene; the electrolyte comprises a solvent and an additive, the solvent comprises carbonic ester and carboxylic ester, and the additive comprises a silane additive. According to the secondary battery disclosed by the invention, the electrolyte is reduced on the surface of the negative pole piece early to form a stable interface protection film, so that the negative active material can be passivated well while the reduction lithium consumption of the negative binder is inhibited, and the first effect and the cycle life of the secondary battery are improved.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises a negative pole piece, a positive pole piece and an electrolyte, the battery monomer comprises a negative current collector and a negative film layer arranged on at least one side of the negative current collector, the negative film layer comprises a negative active material, and the negative active material comprises a carbon-based material; the positive pole piece comprises a positive pole current collector and a positive pole film layer arranged on at least one side of the positive pole current collector, the positive pole film layer comprises a positive pole active material and a positive pole additive, and the positive pole active material comprises the positive pole additive which comprises at least one of lithium-containing iron oxide and lithium-containing cobalt oxide; the electrolyte comprises an organic solvent, the organic solvent comprises a carboxylic ester solvent, and the mass content of the carboxylic ester solvent in the electrolyte is 3%-70%. The high-temperature cycle performance of the battery monomer can be further improved.