20 results about "Fluorinated ether" patented technology

The application provides a fluorinated ether solvent and an electrolyte applied to energy storage batteries, especially lithium metal batteries, and the fluorinated ether solvent has a structure shown in formula I. By introducing at least one fluorine atom at both ends of an ether molecular chain, the fluorinated ether molecule has excellent salt solubility, the introduction of the fluorine atom can effectively reduce the electron cloud density of ether oxygen to improve the oxidation stability of the ether molecule, and excellent cycle stability of the high-voltage lithium metal battery is achieved; meanwhile, the locally strong polar fluorinated end group can interact with the cation of the salt to improve the ionic conductivity of the electrolyte, and the rapid charge-discharge performance of the high-voltage lithium metal battery is improved.

A lithium ion battery includes a cathode including a cathode active material; an anode including silicon, a conductive carbon, lithium metal, or a combination of any two or more thereof; a separator; and an electrolyte including a lithium sulfonylimide salt, a dicarbonyl solvent, and a fluorinated ether solvent.

The object of the present invention is to provide a means capable of improving ion conductively in an electrolyte solution for lithium secondary battery.This object can be solved by an electrolyte solution for lithium secondary battery containing a lithium salt, a carbonate-based first solvent and a fluorinated ether-based second solvent, wherein the ratio of the number of moles of the fluorinated ether-based second solvent to the number of moles of the lithium atoms in the lithium salt is 0.4 or more and 2.0 or less, and the electrolyte solution for lithium secondary battery exhibits a specific profile in its Raman spectrum measured by micro-Raman spectroscopy.

This invention discloses a high-performance polymer electrolyte based on a functionalized fluorinated ether diluent and its preparation method, relating to the field of electrochemical energy storage materials technology. The high-performance polymer electrolyte comprises: a polymer matrix, a lithium salt, an organic dispersion solvent, and a functionalized fluorinated ether diluent. By introducing a fluorinated ether diluent with a specific structure, this invention synergistically regulates the crystallization behavior of the polymer matrix and the lithium-ion solvation structure, solving core problems in traditional polymer electrolytes such as low ionic conductivity, poor interfacial stability, and lithium dendrite growth. The resulting electrolyte possesses high ionic conductivity, high lithium-ion transference number, and excellent interfacial stability, making it suitable for high-energy-density lithium metal batteries.

The object of this invention is to provide a fluorinated ether compound, a fluorinated ether composition, a coating liquid, and an article having a surface layer with excellent fingerprint removal and finger slipperiness, and a method for manufacturing the same. A fluorinated ether compound is represented by formula (1) or formula (2). {(R f1 -A 1 -) p1 Si(-R) 1 ) 3‑p1} q1 -Q 1 (-T) n1 (-R) f2 ) r1 Equation (1). {(R) f1 -A 1 -) p2 Si(-R) 1 ) 3‑p2} q2 -Q 2 (-T) n2 -R f3 -Q 3 (-T) n3 {-Si(-R) 2 ) 3‑p3 (-A) 2 -R f1 ) p3} q3 Equation (2). The symbols in the equation are as described in the instruction manual.

This invention relates to the field of electrochemical technology and discloses a low-temperature fluorine-containing rechargeable magnesium battery electrolyte, comprising a magnesium salt, a main solvent, and a composite additive. The composite additive is a mixed solution of an amine solvent and a fluorinated ether solvent. The concentration of the magnesium salt is 0.1-1.0 mol / L, and the volume ratio of the main solvent to the composite additive is (2-3.3):1. The preparation method includes the following steps: S1: Weigh a certain amount of magnesium salt and dissolve it in the main solvent, stirring for 6-8 hours to form solution A; S2: Slowly add the fluorinated ether solvent to solution A in S1, stirring for 6-8 hours to form solution B; S3: Add the amine solvent to solution B in S2, stirring for 6-8 hours to obtain the low-temperature fluorine-containing rechargeable magnesium battery electrolyte. Its application: The application of a low-temperature fluorine-containing rechargeable magnesium battery electrolyte in rechargeable magnesium batteries. The technical solution of this invention can improve the reversible magnesium deposition and dissolution performance of the electrolyte, and also improve the performance of Mg at low temperatures. 2+ The transport dynamics and ionic conductivity.

Lithium-magnesium alloy anode and fluorinated ether electrolyte for lithium-sulfur batteries. The lithium-magnesium alloy anode contains about 90 wt% lithium and 10 wt% magnesium. The lithium-magnesium alloy anode includes at least one anode protective coating. The electrolyte contains about 0.4 M LiTFSi and about 2 wt% LiNO3 in a fluorinated ether solvent.

The application discloses a local high-concentration electrolyte based on synergistic regulation of cationic electrostatic shielding and molecular dipole and application thereof. The electrolyte comprises a sodium salt, an ether solvent, a fluorinated ether diluent and an additive combination composed of an electrostatic shielding additive and a dipole flattening additive. The electrostatic shielding additive comprises a metal cation salt with a metal cation reduction potential a less than or equal to -2.75 V, and the dipole flattening additive comprises a heterocyclic compound with a lactam structure. The electrostatic shielding additive is preferentially adsorbed on the negative electrode surface tip to form an electrostatic shielding layer by using cations, thereby repelling sodium ion deposition. The dipole flattening additive is adsorbed on the defect site by using a high dipole moment, thereby inducing uniform nucleation and lateral growth of metal ions. The application induces the formation of an SEI film by the dual regulation of electrostatic shielding and dipole flattening, in combination with a specific local high-concentration solvation structure, thereby effectively inhibiting sodium dendrite growth and significantly widening the low-temperature and high-pressure working window of the battery.

We provide fluorinated ether compounds that can form a lubricating layer with excellent wear resistance even when thin, and with minimal reduction in film thickness due to shedding. The fluorinated ether compound is represented by the following formula: R 1 -R 2 -O-CH2-R 3 -CH2-O-R 4 -R 5 (R 3 It is a perfluoropolyether chain. R 1 and R 5 R can be any of the following: alkyl groups that may have substituents, or hydrocarbon groups that have double or triple bonds. 2 and R 4 Each is a divalent linker containing one or more heteroatoms, has one or more polar groups, and is associated with R. 1 and R 5 The terminal part of the bonding side is a heteroatom. R 2 and R 4 At least one of them contains more than one secondary amine structure. R 1 -R 2 - and -R 4 -R 5 (At least one of them has one or more cyano groups).

The application relates to the technical field of lithium metal batteries, and discloses an electrolyte suitable for extreme working conditions, a lithium metal battery and application of the electrolyte. The electrolyte suitable for extreme working conditions is composed of a lithium salt, a main solvent and a fluorinated ether diluent, the main solvent is an ether solvent with a side chain methyl, the molar concentration of the lithium salt is 0.8-1.5 mol / L, and the volume ratio of the main solvent to the fluorinated ether diluent is 1:0.5-2. ‑1 The electrolyte system disclosed by the application not only reduces the direct chemical corrosion of the fluorinated diluent TTE on lithium metal, but also significantly inhibits the oxidative decomposition of solvent molecules on the positive electrode surface under high pressure through the weak solvation characteristics and moderate anion coordination of DMP; the electrolyte system realizes the synergistic regulation of the solvation structure of lithium ions, the interface film forming behavior and the ion transport kinetics, in-situ constructs a SEI / CEI interface film layer rich in inorganic components and mechanically stable on the surface of a lithium metal negative electrode and a high-nickel positive electrode, and fundamentally inhibits the growth of lithium dendrites, slows down the degradation of the positive electrode structure and reduces the interface side reaction rate.

The present application discloses a solvent composition, an electrolyte, and a rechargeable magnesium battery. The composition comprises a fluorinated ether and a non-aqueous solvent in a volume ratio of 1:0.15 to 4, and the non-aqueous solvent comprises an ionic liquid and / or an organic solvent selected from imidazole compounds substituted with C1-C4 alkyl groups, sulfoxide or sulfone compounds with C2-C6, cyclic carbonate compounds with C3-C5, carboxylic ester compounds with C2-C6, pyridine or alkylbenzene aromatic compounds substituted with methyl, chlorine, amino groups or unsubstituted, C1-C4 amide compounds, acetonitrile compounds substituted with chlorine, pyridine or unsubstituted, and an ether compound selected from cyclic monoethers or diethers with C3-C4 or an ether compound satisfying the general formula H3CO(C2H4O) n CH3, where n ranges from 1 to 8, or a combination thereof. The composition utilizes the property that fluorinated ether molecules are relatively easy to obtain electrons to form a stable electrode-electrolyte interface, regulates the solvation structure of the chlorine-containing electrolyte, improves the ionic conductivity, and realizes the reversible electrochemical cycle of the magnesium metal negative electrode at a high current density.

This invention discloses a low-temperature, high-voltage lithium-ion battery electrolyte, comprising a lithium salt, an organic solvent, a stabilizing agent, and a film-forming additive; the lithium salt includes sulfonylimide lithium salts and lithium borate first salts; the organic solvent includes cyclic carbonates, chain ester solvents, and fluorinated ether solvents; the stabilizing agent includes lithium borate second salts, and its mass accounts for 0.01% to 0.5% of the total mass of the electrolyte. The low-temperature, high-voltage lithium-ion battery electrolyte provided by this invention achieves Li + The dynamic reversible reconstruction of the solvation sheath significantly reduces the desolvation energy barrier and effectively inhibits the oxidative decomposition of organic solvents under high voltage. This is beneficial for the formation of a LiF-rich CEI / SEI film at the electrode interface, thereby improving the overall performance of the electrolyte under low temperature and high voltage conditions.

The present invention provides a heat transfer composition comprising at least one refrigerant and at least one dielectric fluid for cooling a battery, a method for using the same, and a method for controlling the temperature of a battery assembly. [Solution] The heat transfer composition comprises a refrigerant for cooling the battery, comprising 20% ​​to less than 100% by weight of a compound selected from halogenated hydrocarbons, perhalogenated compounds, fluorinated ketones, fluorinated ethers and combinations thereof, and a dielectric fluid comprising more than 0% to 80% by weight. The battery assembly is configured such that the heat transfer composition undergoes evaporation.

Electrolyte compositions and materials are provided to facilitate stable cycling of the LiNi0.8Mn0.1Co0.1O2 / / graphite batteries under the 4.7 V conditions. The electrolyte composition includes LiPF6, DEC and MPIE at a mole ratio of 1:3.94:6.11 with the 4.67% addition of FEC (denoted as s-DEC MPIE). The inherent nonflammability of the electrolyte due to the fluorinated ether boosts the safety performance of Ah-level lithium-ion pouch cells, ensuring pouch cells passing stringent nail-penetration tests and elevating the thermal runaway temperature by 20° C. in accelerating rate calorimeter tests. The electrolyte composition demonstrates good industry compatibility and greatly improves the ultra-high voltage stability and safety performance from material level to practical Ah pouch cell level.

This invention discloses a fluorinated ether-containing lithium-sulfur battery electrolyte, its preparation method, and its application. The electrolyte consists of a base electrolyte and a functional diluent, with a volume ratio of the functional diluent to the base electrolyte of (0.1-0.5):1. The base electrolyte includes bis-(trifluoromethanesulfonylimide)lithium, LiNO3, and a solvent, with a mass ratio of bis-(trifluoromethanesulfonylimide)lithium, LiNO3, and the solvent of 11:(0.9-1.1):37. The functional diluent is 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether. This invention utilizes the weak solvation properties of OFE to inhibit polysulfide dissolution, while its decomposition products promote the formation of a LiF-rich SEI layer, effectively solving problems such as polysulfide shuttle effect and lithium dendrite growth in lithium-sulfur batteries. The lithium-sulfur battery assembled with this electrolyte retained 56.4% of its capacity after 450 cycles at 0.5C, demonstrating excellent rate recovery performance. The pouch cell also exhibited good cycle stability.

The present disclosure provides a lithium battery. Specifically, the lithium battery comprises an electrolyte, the electrolyte comprises a fluorinated ether solvent; wherein the fluorinated ether solvent comprises at least one compound of formula (I): wherein R2 and R3 are each independently selected from alkylene or fluorinated alkylene, and the total number of carbon atoms of R2 and R3 is 4, and the total number of fluorine atoms is ≤1; R1 and R4 are each independently methyl or fluorinated methyl, and the total number of fluorine atoms in R1 and R4 is 1-4. Such electrolyte can improve the cycle performance of medium-nickel high-voltage lithium battery, reduce the direct current resistance growth rate under high temperature storage conditions, and is beneficial to the long-term stable operation of lithium battery.

This invention belongs to the field of lithium battery technology and discloses a solid electrolyte membrane based on polymer graft crosslinking, its preparation method, and its application. A lithium salt is dissolved in a high dielectric constant solvent to obtain solution a; a polymer matrix, a functional group donor, and azobisisobutyronitrile are added to a polar solvent and reacted at 60-120℃ for 3-5 h to obtain solution b; wherein the polymer matrix includes any one of fluorinated polymers, polyacrylonitrile polymers, and polyether polymers, and the functional group donor is a fluorinated ether group, an ether oxygen group, or a carbonyl group compound monomer or oligomer; solution c, obtained by mixing solution a and solution b, is subjected to degassing, coating, drying, and annealing to obtain the solid electrolyte membrane. The solid electrolyte membrane of this invention is simple to prepare, can be mass-produced, and is suitable for high-energy-density lithium metal batteries, drones, energy storage systems, and other fields.

Electrolyte compositions and materials are provided to promote stable cycling of LiNi < 0.8 > Mn < 0.1 > Co < 0.1 > O < 2 > / / graphite batteries at 4.7 V conditions. The electrolyte composition includes LiPF6, DEC, and MPIE in a molar ratio of 1: 3.94: 6.11, and FEC (referred to as s-DEC MPIE) in an addition amount of 4.67%. Due to the inherent incombustibility of the electrolyte containing fluorinated ether, the safety performance of the Ah-grade lithium ion soft package battery is improved, so that the soft package battery is ensured to pass a strict nail penetration test, and the thermal runaway temperature is increased by 20 DEG C in an acceleration calorimeter test. The electrolyte composition shows good industrial compatibility, and the ultrahigh pressure stability and safety performance are greatly improved from the material level to the actual Ah soft package battery level.

The fluorinated ether compound represented by the following formula. R 1 -CH2-R 2 -CH2-R 3 -CH2-R 4 -CH2-R 5 -CH2-R 6 -CH2-R 7 (R 2 R 4 R 6 They are perfluoropolyether chains with the same structure; R 3 and R 5 Each is independently a linker group containing one or more hydroxyl groups; R 1 and R 7 Each is independently represented by formula (2). )-O-CH2-CH(OH)-([D]-CH(OH)) s -[E]-CH2OH(2) (s is 0 or 1; [D] and [E] are each independently a chain structure consisting of a combination of 2 to 5 methylene groups and 1 oxygen atom, or a chain structure consisting of 1 to 4 methylene groups; wherein, when s is 0 and [E] contains an oxygen atom, the number of methylene groups contained in [E] is 3 or more).

Provided are an electrolytic solution capable of fully extracting the capacity of a carbon material such as graphite even at a concentration of a general lithium salt, a secondary battery using the electrolytic solution, and a lithium ion secondary battery. 【Solution means】 It contains a fluorinated ether (E) represented by the following formula (E) and a lithium salt. The molar ratio of the lithium salt to the fluorinated ether (E) (lithium salt / fluorinated ether (E)) is 0.4 or less. An electrolytic solution used in a secondary battery containing a carbon material as a negative electrode active material. Rf 1 -O-(CH2) n -O-Rf 2 (E) (Rf 1 and Rf 2 are each independently a fluoroalkyl group having 1 to 6 carbon atoms which may have an ether bond, and n is an integer of 1 to 2. )