128 results about "Fluorinated ether" patented technology

The present invention pertains to a secondary cell having a positive electrode capable of occluding and releasing lithium, and a liquid electrolyte containing a non-aqueous electrolytic solvent, the secondary cell being characterized in that: the positive electrode has a positive electrode active material operating at 4.5 V or higher relative to lithium; and the non-aqueous electrolytic solvent contains a sulfone compound represented by a predetermined formula and a fluorinated ether compound represented by a predetermined formula.

Disclosed is an electrolyte solution which does not cause phase separation at lower temperatures, which has excellent flame retardancy or non-flammability, in which an electrolyte salt is dissolved at a high solubility, which has a high discharge capacity, which is excellent in a charge-discharge cycling property, and which is suitable for an electrochemical device such as a lithium ion secondary battery. The electrolyte solution comprises: a solvent (I) for dissolving an electrolyte salt (II) therein, which comprises a fluorinated ether (A) represented by the formula: Rf1-O-Rf2 [wherein Rf1 and Rf2 are the same as or different from each other, Rf1 is a fluorinated alkyl group having 3 to 6 carbon atoms, and Rf2 is a fluorinated alkyl group having 2 to 6 carbon atoms], at least one fluorinated solvent (B) selected from the group consisting of a fluorinated cyclic carbonate (B1) and a fluorinated lactone (B2), and at least one non-fluorinated carbonate (C) selected from the group consisting of a non-fluorianted cyclic carbonate (C1) and a non-fluorinated linear carbonate (C2); and the electrolyte salt (II), wherein the solvent (I) comprises 20 to 60 vol% of the fluorinated ether (A), 0.5 to 30 vol% of the fluorinated solvent (B), and 5 to 40 vol% of the non-fluorinated cyclic carbonate (C1) and / or 10 to 74.5 vol% of the non-fluorinated linear carbonate (C2), all relative to the total volume of the solvent (I).

To provide a non-aqueous electrolyte solution for secondary batteries, which has a low reactivity with a positive electrode and a negative electrode and which is excellent in stability to prevent thermal runaway of a secondary battery and excellent also in battery properties such as cycle properties and rate 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 composed of a specific complex such as lithium difluoro(oxalato)borate, a fluorinated solvent (A) containing at least one member selected from the group consisting of a fluorinated ether compound, a fluorinated chain carboxylic acid ester compound and a fluorinated chain carbonate compound, and a cyclic carboxylic acid ester compound (B); and a lithium ion secondary battery employing such a non-aqueous electrolyte solution.

A non-aqueous mixed solvent for use in a non-aqueous electrolytic solution for electrochemical energy devices which can enhance the high current charging and discharging capacity and low-temperature charging and discharging capacity of an electrochemical energy device, and prevent the device from damage at high temperatures. The solvent comprises an aprotic solvent and at least one fluorinated ether having a boiling point of 80 DEG C or more and being represented by R1-O-Rf1 (formula 1), R2-O-(Rf2-O)n-R3 (formula 2) or Rfh1-O-A-O-Rfh2 (formula 3). Also electrolytic solutions comprising such solvents and electrochemical energy devices containing such electrolytic solutions.

To provide a process for producing a fluorinated alkyl ether, whereby a sufficient reaction rate can be attained even under mild reaction conditions, and a post-process such as distillation after the reaction can be efficiently carried out.A process for producing a fluorinated alkyl ether, which comprises introducing an aprotic polar solvent, a fluorinated ether, a catalyst, a fluorinated alkyl alcohol and a fluorinated olefin into a reactor, and then, reacting the fluorinated alkyl alcohol with the fluorinated olefin, characterized in that the ratio of the two components of the aprotic polar solvent and the fluorinated ether introduced into the reactor is the aprotic polar solvent / the fluorinated ether=5 / 95 to 80 / 20 by mass ratio.

The purpose of the present invention is to provide a lithium ion secondary battery which has further improved service life characteristics. A lithium ion secondary battery according to the present invention is characterized by comprising: a positive electrode which contains a positive electrode active material that operates at 4.5 V or higher with respect to lithium; and an electrolyte solution which contains a cyclic sulfonic acid ester, LiN(FSO2)2, and an electrolyte solution solvent that contains a fluorinated ether.