128 results about "Fluorinated ether" patented technology

The invention discloses an electrolyte solution for a high-capacity lithium-ion battery. The electrolyte solution includes non-aqueous solvent, lithium hexafluorophosphate, negative electrode film forming additive, positive electrode surface activity inhibiting additive and transition metal ion complexant; the negative electrode film forming additive includes organic ester negative electrode film forming additive of 1 to 10wt% of the total electrolyte solution and inorganic lithium salt negative electrode film forming additive of 0.5 to 2wt% of the total electrolyte solution; the positive electrode surface activity inhibiting additive includes fluorinated ether additive of 1 to 5wt% of the total electrolyte solution and nitrile additive of 0.1 to 5wt% of the total electrolyte solution; the transition metal ion complexant is of 0.1 to 1.0wt% of the total electrolyte solution. The electrolyte solution is adaptive to the high-capacity lithium-ion battery and is capable of optimizing the circulating performance and high-temperature storage performance of the lithium-ion battery. The invention further provides a preparation method of the electrolyte solution and the high-capacity lithium-ion battery adopting the electrolyte solution.

A lithium sulfur battery comprising an electrolyte solvent which comprises at least one fluorosubstituted compound is described. Preferred fluorosubstituted compounds which are predominantly solvents are notably selected from the group consisting of fluorosubstituted carboxylic acid esters, fluorosubstituted carboxylic acid amides, fluorosubstituted fluorinated ethers, fluorosubstituted carbamates, fluorosubstituted cyclic carbonates, fluorosubstituted acyclic carbonates, fluorosubstituted ethers, perfluoroalkyl phosphoranes, fluorosubstituted phosphites, fluorosubstituted phosphates, fluorosubstituted phosphonates, and fluorosubstituted heterocycles. Monofluoroethylene carbonate, cis-difluoroethylene carbonate, trans-difluoroethylene carbonate, 4,4-difluoroethylene carbonate, trifluoroethylene carbonate, tetrafluoroethylene carbonate, 4-fluoro-4-methyl-1,3-dioxolane-2-one, 4-fluoro-4-ethyl-1,3-dioxolane-2-one, 2,2,2-trifluoroethyl-methyl carbonate, 2,2,2-trifluoroethyl-fluoromethyl carbonate are preferred. The solvent may further comprise a non-fluorinated solvent, e.g., ethylene carbonate, a dialkyl carbonate, or propylene carbonate. Use of such fluorinated compound as additive for such batteries and specific electrolyte solutions.

Polyfluorinated ethers and polyfluorinated ketones and mixtures thereof, preferably polyfluorinated ethers such as methyl(trifluoroethyl)ether (CH₃OCH₂CF₃), methyl(heptafluoropropyl)ether (CH₃OCF₂CHFCF₃), di(trifluoroethyl)ether (CF₃CH₂OCH₂CF₃), methyl(hexafluoropropyl)ether (CH₃OCF₂CF₂CHF₂), methyl(pentafluoropropyl)ether (CH₃OCH₂CF₂CF₃), methyl (perfluorobutyl)ether (C₄F₉OCH₃), ethyl(perfluorobutyl)ether (C₄F₉OC₂H₅), and polyfluorinated ketones such as methyl(perfluoromethyl)ketone (CF₃COCH₃), perfluoromethyl(trifluoroethyl)ketone (CF₃CH₂COCF₃), methyl(perfluooroethyl)ketone (C₂F₅COCH₃), methyl(perfluoropropyl)ketone (F₃CF₂CF₂COCH₃), perfluoroethyl(perfluoropropyl)ketone (CF₃CF₂CF₂COC₂F₅), methyl(octafluorobutyl)ketone (C₂F₅CFHCF₂COCH₃), di(perfluoropropyl)ketone (CF₃CF₂CF₂COCF₂CF₂CF₃), and mixtures thereof meet the requirement for not adversely affect atmospheric chemistry and would be a negligible contributor to ozone depletion and to green-house global warming in comparison to the fully halogenated hydrocarbons and are suitable for use as working fluids for u se i n thermal energy conversion systems such as an organic Rankine cycle system.

The invention discloses an electrolyte solution for a lithium-sulfur battery. The electrolyte solution comprises an electrolyte lithium salt, an ionic liquid, a non-solvent liquid and an additive, wherein the viscosity of the non-solvent liquid is lower than that of the used ionic liquid; the solubility of the lithium salt and polysulfide lithium formed in charge and discharge processes in the non-solvent liquid is much lower than the corresponding solubility in the ionic liquid; the additive is another lithium salt with a film-forming function, which is different from the electrolyte lithiumsalt; and fluorinated ether can be selected as the non-solvent liquid. The electrolyte solution mainly aims at developing a complementary synergistic effect of the ionic liquid and the non-solvent liquid; and through assist of the film-forming lithium salt, on one hand, the viscosity of an ionic liquid-based electrolyte solution is reduced and the ionic conductivity of the electrolyte solution isimproved, and on the other hand, the capacity of the electrolyte solution for inhibiting dissolving and shuttling of the polysulfide lithium is strengthened. By adopting the electrolyte solution disclosed by the invention, various negative effects, caused by the polysulfide lithium, to the lithium-sulfur battery are greatly avoided, and the properties, such as the capacity, the cycle performance and the rate capability of the battery are improved as a whole.

A non-aqueous electrolytic solution for use in a lithium secondary battery has reduced or eliminated flammability and increased capacity retention. The electrolytic solution includes a lithium salt, a carbonate, a substituted phosphazene, a fluorinated solvent such as fluorinated carbonate, fluorinated ether, and fluorinated ester, and an organic phosphate or organic phosphonate such as fluorinated alkyl phosphate, fluorinated aromatic phosphate, fluorinated alkyl phosphonate, or fluorinated aromatic phosphonate.

A non-aqueous electrolyte is provided that includes a non-aqueous solvent and an electrolyte salt, wherein the non-aqueous solvent contains a fluorinated ether (1) represented by the following Formula: HCF₂CF₂CF₂CH₂—O—CF₂CF₂H (1). This non-aqueous electrolyte has good wettability to a polyolefin separator, can provide a battery with excellent load characteristics for a long period, does not easily decompose in the battery under high-temperature storage, and causes little gas generation due to decomposition. Furthermore, a non-aqueous electrolyte secondary battery is provided that includes a positive electrode, a negative electrode, a separator, and the above-described non-aqueous electrolyte.

The present invention relates to a secondary battery cg a positive electrode capable of absorbing and releasing lithium, and a electrolyte solution containing a non-aqueous electrolytic solvent, wherein the positive electrode has a positive electrode active material which operates at 4.5 V or more relative to lithium, and wherein the non-aqueous electrolytic solvent contains a sulfone compound represented by a predetermined formula and a fluorinated ether compound represented by a predetermined formula.

The invention provides an electrochemical device having an electrolyte solution comprising: (I) a solvent for dissolving an electrolyte salt, which comprises (A) a fluorinated ether represented by the formula (1), (B) a cyclic carbonate and (C) a linear carbonate compatible with both the fluronated ether (A) and the cyclic carbonate (B); and (II) the electrolyte salt, wherein the solvent (I) contains the fluorinated ether (A) in an amount of 30 to 60% by volume, the cyclic carbonate (B) in an amount of 3 to 40% by volume and the linear carbonate (C) in an amount of 10 to 67% by volume relative to the total volume of the solvent (I). Rf-O-Rf (1) wherein Rf and Rf2 independently represent a fluorinated alkyl group having 3 to 6 carbon atoms. The electrochemical device hardly causes phase-separation even at lower temperatures, and has excellent flame retardancy and heat resistance, can highly dissolve an electrolyte salt, has a high discharge capacity, and is excellent in charge/discharge cycle property.

The object of an exemplary embodiment of the invention is to provide a secondary battery which contains a positive electrode active material operating at a potential of 4.5 V or higher and which has good cycle property at a high temperature. An exemplary embodiment of the invention is a secondary battery, comprising a positive electrode that can absorb and desorb lithium and an electrolyte liquid; wherein the positive electrode comprises a positive electrode active material that operates at a potential of 4.5 V or higher with respect to lithium; and wherein the electrolyte liquid comprises a fluorinated ether represented by a prescribed formula and a cyclic-type sulfonate represented by a prescribed formula.

A lithium ion secondary battery which meets the requirement [1] of satisfying the formulae (a) to (c) or the requirement [2] of satisfying the formulae (b), (d), and (e): (a) 5≦A≦25, (b) 10≦B≦60, (c) 40≦2A+B≦90, (d) 0.2≦C≦1.2, and (e) −80 200C<3B≦150, wherein A (μm) represents an average particle size of a positive electrode active material; B (vol. %) represents a volume concentration of a fluorinated ether in a nonaqueous electrolyte solution; and C (m²/g) represents a specific surface area of the positive electrode active material.

The object is to provide a non-aqueous electrolyte solution for secondary batteries, which has sufficient ion conductivity and which is provided also with excellent high voltage cycle properties and high voltage high temperature preserving properties, and a lithium ion secondary battery employing such a non-aqueous electrolyte solution.

A non-aqueous electrolyte solution for secondary batteries, comprising a lithium salt and a liquid composition, wherein the liquid composition comprises from 5 to 50 vol % of a specific fluorinated ether compound, from 5 to 70 vol % of a specific fluorinated cyclic carbonate compound, and from 1 to 35 vol % of a specific sultone compound, and a lithium ion secondary battery employing such a non-aqueous electrolyte solution.

A refrigerator oil composition includes: a synthetic base oil; and a partial hydrocarbyl ether of an aliphatic polyhydric alcohol condensate, in which the aliphatic polyhydric alcohol condensate includes a condensate of 4 to 20 molecules of a hindered glycol and/or an aliphatic polyhydric alcohol having 3 to 6 hydroxyl groups. The refrigerator oil composition is preferably used in a compression refrigerator that uses a hydrofluorocarbon, a natural refrigerant such as a hydrocarbon, carbon dioxide, or ammonia, a mixed refrigerant of fluoroiodomethane and propene, an unsaturated fluorinated hydrocarbon, a fluorinated ether, a fluorinated alcohol, a fluorinated ketone, or a mixture thereof as a refrigerant, has a low coefficient of friction, and is excellent in energy-saving property.

A method for preparing saturated partially fluorinated alkoxy carboxylic acids or salts thereof by treating a compound: (II), where R_f represents a fluorinated, linear or branched alkyl residue interruptible by one or more oxygen atoms, n is 0 or 1, with a Z-anion in a reaction medium comprising water and an organic solvent, where the Z-anion is selected from CN—, SCN— and OCN— or combinations thereof. A method of making partially fluorinated ethers of the general formula (I) wherein R_f is defined as above, n is 0 or 1, and Z is nitrile (—CN), azide (—N₃), thiocyanate (—SCN) or cyanate (—OCN) group, said method comprising treating a fluorinated olefin of the general formula (II) wherein the Z-anion is CN—, OCN—, SCN— or N₃₋. A compound of the general formula (I) as previously described where Z is selected from SCN, OCN and N₃.

The invention discloses a non-aqueous electrolyte for lithium ion battery and a lithium ion battery using the electrolyte. A non-aqueous electrolyte for a lithium ion battery comprises a lithium salt,Organic solvents and additives, the lithium salt may be selected from the group consisting of LiPF 6, one or more of LiBF4, LiClO4 and the like, wherein the organic solvent is selected from the groupconsisting of chain carbonate, cyclic carbonate, carboxylic ester and a mixed organic solvent of a fluorinated ether compound represented by the general formula (I), and may further comprise a commonly used additive of a high voltage type. The non-aqueous electrolyte for lithium ion battery is added with fluorinated ether solvent, and the addition of fluorinated ether improves the oxidation decomposition voltage of the organic solvent and improves the working performance of the electrolyte under the condition of high voltage.

A lithium secondary battery including: a cathode including a high-voltage cathode active material; an anode; and an electrolyte disposed between the cathode and the anode, wherein the high-voltage cathode active material has a charge cut-off voltage of about 4.2 Volts or greater with respect to a lithium (Li) counter electrode, and wherein the electrolyte includes an organic fluorinated ether compound represented by Formula 1, an organic solvent, and a lithium salt:

R₁—O—CF_nH_2-n—R₂   Formula 1

• • wherein, in Formula 1, R₁ is a C1-C10 alkyl group, a C3-C10 cycloalkyl group, a C1-C10 fluorinated alkyl group, or a C3-C10 fluorinated cycloalkyl group; R₂ is hydrogen, fluorine, a C1-C10 alkyl group, a C3-C10 cycloalkyl group, a C1-C10 fluorinated alkyl group, or a C3-C10 fluorinated cycloalkyl group; and n is 1 or 2.

To provide a secondary circulation cooling system using a composition which is less influential over the environment as a secondary coolant, is non-inflammable, has a small pressure drop particularly at a low temperature and has a large heat transfer coefficient.

A secondary circulation cooling system comprising a primary cooling means 1 using a primary coolant, a secondary circulation cooling means 13 using a secondary coolant and a heat exchange means 6 to carry out heat exchange between the primary coolant and the secondary coolant, characterized in that a composition comprising a fluorinated ether such as CF₂HCF₂OCH₂CF₃, and an alcohol such as ethanol, is used as the secondary coolant.