3712results about "Organic electrolytes" patented technology

The invention provides a positive electrode, a low-temperature electrolyte, a low-temperature sodium-ion battery and a preparation method and application of the low-temperature sodium-ion battery, and belongs to the technical field of battery materials. The low-temperature sodium ion battery comprises a positive electrode, a negative electrode and a low-temperature electrolyte, wherein the positive electrode comprises a positive electrode active material, a binder, sodium salt containing fluorine and sulfur and conductive carbon; the positive electrode is improved by adding sodium salt containing fluorine and sulfur, sulfur / fluorine rich in anion derivatives can be formed on a contact interface of the positive electrode and an electrolyte to form a firm SEI film, the internal resistance of the battery is further reduced, and the coulombic efficiency of the battery during charging and discharging at normal and low temperatures is improved. The low-temperature electrolyte comprises an ester solvent and an ether additive, by adding the ether solvent, the physicochemical property of the electrolyte and the composition of an SEI film on a contact interface of an electrode and the electrolyte are optimized, the viscosity of the electrolyte at low temperature is reduced, the ionic conductivity is improved, and formation of the SEI film rich in sodium fluoride on the surface of a negative electrode can be promoted; and thus, the problem of low coulombic efficiency of battery charge-discharge cycle at low temperature is solved.

A method for a tightness test of a test object filled with a liquid, said test object having an internal pressure which is lower than atmospheric pressure, comprising the following steps: inserting the test object into a test chamber, evacuating the test chamber to a pressure which is lower than the internal pressure inside the test object, drawing off the test chamber residual gas components together with gas components desorbing from a wall of the test chamber and parts of the liquid escaping from the test object through a leak in the latter without any carrier gas being fed to the test chamber from outside, transporting the drawn-off residual gas components together with the parts of the liquid escaped from the test object to a detector, and detecting parts of the liquid escaped through a leak in the test object by means of a detector.

The invention provides a sodium ion battery, an energy storage device and an energy storage system. The sodium ion battery comprises a positive pole piece, a diaphragm, a negative pole piece and an electrolyte, the negative pole piece comprises a carbon material, the specific surface area of the carbon material is x, the carbon material comprises mesopores, the number percentage of the mesopores in the carbon material is y, and the electrolyte comprises an organic solvent, an electrolyte salt, an organic additive and a sodium salt additive, the organic solvent comprises cyclic carbonate and chain carbonate, the mass fraction of the cyclic carbonate in the electrolyte is a, the mass fraction of the chain carbonate in the electrolyte is b, the mass fraction of the organic additive in the electrolyte is c, and the mass fraction of the sodium salt additive in the electrolyte is d; the sodium ion battery meets the relational expression of 0.4 < = a / y < = 0.8; 0.5 < = a / b < = 1.3; 0.4 < = c / x < = 1.2; and 0.1 < = d / c < = 0.5.

A positive electrode material of the present disclosure includes: a positive electrode active material; and a first solid electrolyte material coating at least partially a surface of the positive electrode active material, wherein the first solid electrolyte material includes Li, Ti, M1, and F, and the M1 is at least one element selected from the group consisting of Ca, Mg, Al, Y, and Zr.

The invention provides a battery monomer, a battery device, a power utilization device and an energy storage device. The single-side coating mass of the negative electrode active material layer is 80 mg / 1540.25 mm < 2 > to 150 mg / 1540.25 mm < 2 >, and based on the total mass of the negative electrode film layer active material layer, the mass ratio of the silicon element is 0.5% to 5%; and the viscosity of the electrolyte at the normal temperature is 2.3 mPa.s to 3.5 mPa.s. And the battery monomer gives consideration to improvement of energy density, fast charging performance and cycling stability, and comprehensive improvement of battery performance is realized.

The invention provides a battery monomer, a battery device, a power utilization device and an energy storage device. The size of the positive electrode active material layer in the length direction of the electrode assembly is 300 mm to 950 mm; in the length direction of the electrode assembly, the difference value between the size of the negative electrode active material layer and the size of the positive electrode active material layer is OH1, and OH1 is larger than 1 mm and smaller than 5 mm; in the width direction of the electrode assembly, the difference value between the size of the negative electrode active material layer and the size of the positive electrode active material layer is OH2, and OH2 is larger than 1 mm and smaller than or equal to 4 mm; based on the total mass of the electrolyte, the mass ratio of the carboxylic ester solvent is 8%-57%, and the mass ratio of the fluorine-containing sulfimide lithium salt is 3%-8%. The battery monomer gives consideration to improvement of energy density, fast charge performance, cycle stability under fast charge and safety performance, and comprehensive improvement of battery performance is realized.

The invention discloses an electrolyte additive composition, an electrolyte, a battery and an electric device. The electrolyte additive composition comprises an impedance stabilizing additive and an isocyanate additive in a weight ratio of (0.1-0.8): 1. According to the electrolyte additive composition, the impedance stabilizing additive and the isocyanate additive are compounded, and the content ratio of the impedance stabilizing additive and the isocyanate additive is regulated, so that the stability of the impedance stabilizing additive in the electrolyte can be improved, the DCR of a battery cell is reduced, the stability of the DCR of the battery cell in the charging, discharging and storage processes is improved, and the service life of the battery cell is prolonged. Therefore, the RTE of the battery in the service period is improved. The electrolyte contains the electrolyte additive composition, and the battery contains the electrolyte. The electric device comprises the battery.

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 present invention relates to a high-voltage lithium metal battery, characterized by its non-flammability due to the high flash point and high thermal stability of its specifically designed electrolyte, thereby ensuring its safe operation. In particular, the battery comprises an electrolyte with lithium salts and a novel diether compound with asymmetrical fluorination, developed based on electrolyte molecular design, synthesis and thermophysical properties characterization. The electrolyte with the asymmetrically fluorinated diether compound exhibits high thermal stability through high boiling point and high flash point, while also having a high working voltage, allowing high energy density designs and simultaneously optimizing operation safety by minimizing flammability and flash risks.

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.

This application provides an electrolyte for lithium-ion battery, a lithium-ion battery, a battery module, a battery pack, and an apparatus. The electrolyte includes an organic solvent, an electrolytic lithium salt dissolved in the organic solvent, and additives, where the additives include a first additive and a second additive. The first additive includes an alkenyl dioxaborolane compound represented by formula I or formula II, and the second additive includes phosphoric acid cyclic anhydride represented by formula III. After the electrolyte of this application is applied to a lithium-ion battery, the lithium-ion battery can, at high voltage, have a good high-temperature cycling performance and high-temperature storage performance, a low direct current resistance, as well as good high-voltage characteristics.

Disclosed is an electrolyte for a lithium-sulfur battery and a lithium-sulfur battery including the same, more specifically an electrolyte for a lithium-sulfur battery including a lithium salt, a non-aqueous organic solvent, and an additive, wherein the additive includes a sulfide compound. The electrolyte for the lithium-sulfur battery improves the efficiency and stability of the negative electrode, thereby improving the capacity and lifetime characteristics of the lithium-sulfur battery.

A negative pole piece in the secondary battery comprises a negative current collector and a negative film layer, the negative film layer is arranged on at least one side of the negative current collector, the negative film layer comprises a negative active material, the negative active material comprises first graphite, and the Dv50 particle size of the first graphite is 2.2-7.7 [mu] m; the electrolyte comprises an organic solvent and an organic additive, the organic solvent comprises a first solvent, the first solvent comprises cyclic carbonate, and the mass content of the first solvent is 25%-40% based on the total mass of the organic solvent; the organic additives comprise a first additive and a second additive, the first additive comprises vinylene carbonate, the second additive comprises an ethylene carbonate derivative, based on the total mass of the electrolyte, the mass percent of the first additive in the electrolyte is 2%-10%, and the mass percent of the second additive in the electrolyte is 0.3%-6%.

Embodiments described herein relate generally to semi-solid electrodes, and methods of producing the same. In some embodiments, a method of forming a semi-solid electrode can include mixing an active material, a conductive material, and an electrolyte solvent to produce a semi-solid material. The electrolyte solvent is free of electrolyte salt. The method further includes dispensing the semi-solid material onto a current collector and wetting the semi-solid material with an electrolyte solution to form the semi-solid electrode. In some embodiments, the wetting can be via spraying. In some embodiments, the electrolyte salt can have a concentration in the electrolyte solution of at least about 1 M, at least about 2 M, or at least about 3 M. In some embodiments, the solvent can include ethyl methyl carbonate (EMC), ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), gamma-Butyrolactone (GBL), or any combination thereof.

Described herein are lithium-metal rechargeable electrochemical cells comprising a lithium-metal negative electrode, a positive electrode, and a liquid electrolyte. The liquid electrolyte comprises a core mixture and a diluent. The diluent comprises a fluorinated ether. The core mixture comprises a set of salts and a set of solvents. The set of solvents comprises a pyrrolidinium-containing ionic liquid and a molecular solvent. The molecular solvent is a non-fluorinated ether, for example including but not limited to 1,2-dimethoxyethane. In some examples, the electrolyte further comprises an electrolyte additive, for example including but not limited to tris(trimethylsilyl)phosphate. In some examples, the set of salts comprises one or more imide-containing lithium salts. In some examples, the set of salts comprises lithium bis(fluorosulfonyl)imide and an additional salt and the mole fraction of lithium bis(fluorosulfonyl)imide in the set of salts is 0.5 or greater.

The invention provides a battery monomer, a battery device and a power utilization device. In the battery monomer, a positive electrode active material comprises lithium-containing phosphate with an olivine structure; the average particle size Dv50 of the negative electrode active material is 8-15 [mu] m, and the negative electrode active material comprises graphite; the electrolyte comprises a carbonic ester additive, the carbonic ester additive comprises fluoroethylene carbonate (FEC) and vinylene carbonate (VC), and based on the total mass of the electrolyte, the mass ratio of the carbonic ester additive is 0.5%-7%.

The application relates to a cylindrical battery monomer, a battery and a power utilization device. The cylindrical battery monomer comprises electrolyte, an electrode assembly and a shell. The shell contains the electrolyte and the electrode assembly. The electrolyte comprises an electrolyte salt, and the electrolyte salt comprises a hexafluorophosphate. The shell comprises a shell body and a film layer. The film layer is arranged on at least a surface of the shell body facing the electrode assembly. The base element of the film layer is a nickel element. The use reliability and the cycle performance of the cylindrical battery monomer in the embodiment can be improved.

The embodiment of the invention provides a battery monomer, a secondary battery and a power utilization device, the battery monomer comprises a shell and an electrode assembly arranged in the shell, and the group margin q of the battery monomer is greater than or equal to 85% and less than or equal to 98%; the electrode assembly comprises a negative electrode plate, the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer arranged on the surface of at least one side of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-containing material; the battery monomer comprises an electrolyte, and the kinematic viscosity eta of the electrolyte is greater than or equal to 1 mm < 2 > / s and less than or equal to 3 mm < 2 > / s. The battery monomer of which the negative active material comprises the silicon-containing material has good cycle performance.

Electrochemical devices are disclosed for various applications such as secondary batteries. In an embodiment, an electrochemical device includes a positive electrode, a negative electrode, a separator, and an electrolyte. The separator includes a porous separator including inorganic fibers or including inorganic particles and a polymer binder, and the electrolyte includes a nitrile-based compound. The electrochemical device exhibits high ionic conductivity by including the porous separator having wettability to the electrolyte.

The application provides a lithium ion battery and an electric device, the lithium ion battery comprising a positive electrode sheet and an electrolyte, an active substance in the positive electrode sheet comprising a phosphate lithium positive electrode material and a lithium nickel cobalt manganese oxide, the electrolyte comprising a positive electrode film former, a negative electrode film former and a lithium salt, the lithium salt comprising lithium hexafluorophosphate and a lithium bisfluorosulfonylimide salt, the lithium ion battery satisfying the following formula: wherein NL is a mass ratio of the lithium nickel cobalt manganese oxide and the phosphate lithium positive electrode material, S alt is a value of a molar concentration of the lithium hexafluorophosphate and the lithium bisfluorosulfonylimide salt in the electrolyte in mol / L, and A dd is a mass ratio of the positive electrode film former and the negative electrode film former. The application can adjust the ratio of the positive electrode film former and the negative electrode film former and the ratio of the high-heat-resistance lithium salt according to the mixing ratio of the ternary material doped in the lithium manganese iron phosphate or the lithium iron phosphate, so that the cycle performance of the battery is improved.

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, the electrode assembly comprises a positive pole piece, a negative pole piece and a non-aqueous electrolyte, the positive pole piece comprises a positive current collector and a positive active layer arranged on the positive current collector, and the positive active layer comprises a positive lithium supplementing material; the non-aqueous electrolyte comprises an electrolyte additive as shown in a formula (I). The energy density, the cycle performance and the high-temperature storage performance of the battery are improved at the same time.

The application relates to an electrolyte, a secondary battery and a power device, wherein the components of the electrolyte comprise a functional compound shown in formula (1), T1-T3 are independently selected from any one of the following groups: alkyl with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, alkynyl with 2-10 carbon atoms and groups shown in formula (a)-(f); and at least one of T1-T3 is selected from the group shown in formula (a), and at least one is selected from the group shown in formula (b), (c), (d) or (e). The functional compound shown in formula (1) can capture oxidation products in the charging and discharging process of the electrolyte, improve the toughness of the formed SEI film, and further improve the cycle performance of the secondary battery.

The invention provides an additive composition, an electrolyte thereof and a battery. The additive composition comprises a first additive and a second additive, the first additive comprises a compound with a structure as shown in a formula 1, and the second additive comprises a silane additive. When the additive composition provided by the invention is applied to the electrolyte, the cycle performance and the high-temperature performance of the battery can be improved.

In order to solve the problem that an existing battery with high-voltage lithium cobalt oxide matched with a silicon-doped negative electrode is insufficient in cycle performance and safety performance, the invention provides a lithium ion battery which comprises a positive electrode, a negative electrode, a diaphragm and a non-aqueous electrolyte, and the non-aqueous electrolyte comprises a non-aqueous organic solvent, electrolyte salt and an additive, the non-aqueous organic solvent comprises acetic acid 2, 2-difluoroethyl ester, the additives comprise a first additive and a second additive, the first additive comprises a sulfur-containing additive as shown in a structural formula 1: # imgabs0 # structural formula 1, and the second additive comprises a nitrile compound; the lithium ion battery satisfies the following conditions: # imgabs 1 #, 0.1 < = a < = 3, 0.5 < = b < = 5, 1 < = c < = 40, 0.2 < = d < = 7, and 5 < = e < = 30. The lithium ion battery provided by the invention has relatively excellent high-temperature cycling stability and relatively good thermal shock resistance safety performance.

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 provides an electrolyte and application thereof. The electrolyte comprises fluoroethylene carbonate and a borate compound. When the electrolyte is used in the battery, the formation of a high-quality SEI film on the surface of a negative electrode is facilitated, and the side reaction of the silicon-based battery is effectively inhibited, so that the impedance of the battery is reduced, and the high-temperature cycle and high-temperature storage performance of the battery is improved.

A preparation method for a dual-enhanced interface solid polymer electrolyte by means of step-by-step polymerization, the preparation method comprising: mixing a matrix monomer and a first photoinitiator to obtain a mixed slurry, and illuminating same to obtain a pre-polymerized slurry; adding a lithium salt and a second photoinitiator to the pre-polymerized slurry, mixing same to obtain a polymer slurry, dividing the polymer slurry into a first polymer slurry and a second polymer slurry, adding a nitrogen-containing functional monomer to the first polymer slurry to obtain a polymer slurry A, and adding a fluorine-containing functional monomer to the second polymer slurry to obtain a polymer slurry B; and pouring the polymer slurry A on a first face of a base membrane, performing a treatment on same, pouring the polymer slurry B on a second face of the base membrane, and performing a treatment on same, so as to obtain a stepwise-polymerized dual-enhanced interface solid polymer electrolyte. The solid polymer electrolyte is prepared by means of using a step-by-step polymerization method, thereby optimizing a positive electrode side interface and a negative electrode side interface, and realizing continuous large-scale production of a solid polymer electrolyte.

This application provides an electrolyte composition, a secondary battery, a battery module, a battery pack, and an electrical device. The electrolyte composition is a non-Newtonian fluid electrolyte composition. The electrolyte composition can improve the impact resistance and safety of the battery by a thixotropic action that occurs in response to an applied external force.

The invention belongs to the field of lithium ion batteries, and particularly relates to a lithium-rich manganese-based lithium ion battery and an electrolyte thereof, the electrolyte is a solution containing a composite solvent and a composite lithium salt, the composite solvent comprises EMC, DEC, FEC and a formula 1 # imgabs 0 #, and the composite lithium salt comprises LiPF6 and a formula 2 # imgabs 1 # lithium salt. Innovative research shows that by adopting the quaternary combined composite solvent to be matched with the special combined composite lithium salt, synergism can be accidentally realized, the physicochemical characteristics of the lithium-rich manganese-based battery can be adapted, oxygen free radicals can be effectively removed, and HF can be effectively captured. Research shows that the electrolyte can effectively improve the long cycle stability of the lithium-rich manganese-based battery at high voltage and high temperature.

The present disclosure relates to an electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same. More specifically, the electrolyte solution contains the polymer compound represented by Formula 1, and thus can improve high temperature durability, stability, and lifetime characteristics of the lithium secondary battery.