Daikin Industries, Ltd.

Atomis Inc.

Michiru Kagawa

Meiten Koh

Akiyoshi Yamauchi

Aoi Nakazono

Hideo Sakata

Shinichi Kinoshita

Shigeaki Yamazaki

Kazuhiro Furusho

Yoshinori Nanba

Yoshiko Kuwajima

Dai Kataoka

Akinori Tani

Akinari Sugiyama

Mayuko Taeda

Hiroki Yamaguchi

Hitomi Nakazawa

Michiaki Okada

Kouji Kubota

Toru Yoshizawa

Masahiro Tomita

Yuki Adachi

Kyouhei Sawaki

Tomoyo Sanagi

Hitoshi Motoyama

Yasuhide Senba

Akiko Oya

Tomoo Shimada

Daisuke Asari

Kenji Sumida

The present invention provides a lithium ion secondary cell excellent in high-temperature storage characteristics and high voltage cycle characteristics; and a nonaqueous electrolyte for the cell. The present invention relates to a lithium ion secondary cell, comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte containing nonaqueous solvents and an electrolyte salt, the nonaqueous solvents comprising a fluorine-containing ether represented by the formula (1):Rf&#x2014;O&#x2014;Rf&#x2003;&#x2003;(1)wherein Rfand Rfare the same as or different from each other, each being a Calkyl group or a Cfluoroalkyl group; and at least one of Rfand Rfis a fluoroalkyl group, and the following compounds (I) and (II): (I) a fluorine-containing unsaturated compound; and (II) a hydroxy group-containing compound represented by the formula (2):RfOH&#x2003;&#x2003;(2)wherein Rfis the same as above, and the nonaqueous solvents comprising the compounds (I) and (II) in a total amount of 5000 ppm or less for the fluorine-containing ether.

Lithium ion secondary battery and nonaqueous electrolyte for lithium ion secondary battery

The present invention aims to provide an electrolyte solution for forming, for example, a secondary battery having excellent oxidation resistance and high voltage cycle characteristics; an electrochemical device such as a lithium-ion secondary battery that contains the electrolyte solution; and a module that contains the electrochemical device. The present invention provides an electrolyte solution containing a solvent and an electrolyte salt, wherein the solvent contains a fluorine-containing compound (A) represented by formula (1) shown below, and a fluorine-containing compound (B) represented by formula (2) shown below:RfOCOOR&#x2003;&#x2003;(1)wherein Rfis a C1-C4 fluorine-containing alkyl group, and R is a C1-C4 non-fluorinated alkyl group, andRfOCOORf&#x2003;&#x2003;(2)wherein Rfand Rfare the same or different, and each is a C1-C4 fluorine-containing alkyl group.

Electrolytic solution containing mixture of fluorinated chain carbonates, electrochemical device, lithium ion secondary battery and module

An electrolytic solution including a nonaqueous solvent (I), an electrolyte salt (II), and 0.001 to 20% by mass of a compound represented by the formula (1) or the formula (A) as defined herein.

Electrolytic solution, electrochemical device, lithium ion secondary battery, and module

The present invention aims to provide an electrolyte solution for forming, for example, a secondary battery having excellent oxidation resistance and high-temperature storage characteristics; an electrochemical device such as a lithium-ion secondary battery that contains the electrolyte solution; and a module that contains the electrochemical device. The present invention provides an electrolyte solution containing a solvent and an electrolyte salt, wherein the solvent contains a fluorine-containing compound (A) represented by formula (1) shown below in an amount of 0.01 to 20% by mass, and a fluorine-containing compound (B) represented by formula (2) shown below in an amount of 10 to 80% by mass:RfOCOOR&#x2003;&#x2003;(1)wherein Rfis a C1-C4 fluorine-containing alkyl group, and R is a C1-C4 non-fluorinated alkyl group, andRfOCOORf&#x2003;&#x2003;(2)wherein Rfand Rfare the same or different, and each is a C1-C4 fluorine-containing alkyl group.

There is provided a method of preparing a high purity fluorine-containing ether which inhibits a side reaction generating an unsaturated bond and assures low cost and simple steps. When preparing the fluorine-containing ether by allowing a fluorine-containing alkyl alcohol to react with a fluorinated olefin in the presence of a basic compound, a reaction is terminated at a stage before a conversion ratio of the fluorine-containing alkyl alcohol reaches 75%.

Method of preparing fluorine-containing ether

There is provided a process for preparing a fluoropropylene carbonate safely at high yield by one step (one pot), and the process is characterized by allowing a fluorinating agent to act on a propylene carbonate derivative having a group to be released in a fluorination reaction.

Process for preparing fluoropropylene carbonate

There is provided a non-aqueous electrolytic solution assuring good solubility of an electrolyte salt and having enough cell characteristics (charge and discharge cycle characteristic, discharge capacity, and the like), and the non-aqueous electrolytic solution comprises a solvent for dissolving an electrolyte salt comprising (A) at least one fluorine-containing solvent selected from the group consisting of fluorine-containing ethers and fluorine-containing carbonates, (B) a non-fluorine-containing cyclic carbonate and (C) a chain ester represented by the formula (C): RCOOR, wherein Ris an alkyl group having 2 to 4 carbon atoms; Ris an alkyl group having 1 to 4 carbon atoms or a fluorine-containing alkyl group having 1 to 4 carbon atoms, and (II) an electrolyte salt.

Non-aqueous electrolytic solution

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Settsu, Japan

Michiru Kagawa