Daikin Industries, Ltd.

Aoi Nakazono

Meiten Koh

Akiyoshi Yamauchi

Hideo Sakata

Mayuko Taeda

Michiru Kagawa

Hitomi Nakazawa

Tomoyo Sanagi

Kyouhei Sawaki

Yuki Adachi

Akinori Tani

Masahiro Tomita

Shinichi Kinoshita

Shigeaki Yamazaki

Yoshiko Kuwajima

Michiaki Okada

Toru Yoshizawa

Hitomi Miyawaki

Yasuhide Senba

Hitoshi Motoyama

Tomoo Shimada

Tani Akinori

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

A non-aqueous electrolyte including (i) a compound represented by the general formula (1):X&#x2014;R&#x2014;SOF&#x2003;&#x2003;(1)where R is a Clinear or branched alkylene group optionally containing an ether bond and optionally hydrogen atoms of the alkylene group are partly substituted by a fluorine atom(s); and X is a carboxylic acid derivative group), (ii) a non-aqueous solvent and (iii) an electrolyte salt.

Non-aqueous electrolyte and battery

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.

An object of the present invention is to provide a battery having excellent durability at high temperature and high voltage. The present invention is a battery including a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the non-aqueous electrolyte contains (i) a compound represented by the general formula (1):Rf&#x2014;SOF&#x2003;&#x2003;(1)(where Rf is a Clinear or branched fluorine-containing alkyl group optionally containing an ether bond and optionally containing a double bond).

Battery and non-aqueous electrolyte

The present invention aims to provide an electrochemical device excellent in high temperature storage characteristics and cycling characteristics at high voltages, and a nonaqueous electrolyte for the electrochemical device. The present invention relates to an electrochemical device including: a positive electrode; a negative electrode; and a nonaqueous electrolyte containing a nonaqueous solvent and an electrolyte salt, wherein the nonaqueous solvent contains a fluorinated linear carbonate represented by the formula (1):RfOCOOR&#x2003;&#x2003;(1)(wherein Rf represents a C1-4 fluorinated alkyl group and R represents a C1-4 alkyl group), and further contains following compounds of (I) to (III) in a total amount of not more than 5000 ppm relative to the fluorinated linear carbonate: (I) a compound represented by the formula (2)RfOH&#x2003;&#x2003;(2)(wherein Rf is defined as above); (II) a compound represented by the formula (3)ROH&#x2003;&#x2003;(3)(wherein R is defined as above); and (III) a compound represented by the formula (4)ROCOCl&#x2003;&#x2003;(4)(wherein R is defined as above).

Electrochemical device and nonaqueous electrolyte solution for electrochemical device

Provided is an electrolytic solution exhibiting excellent withstand voltage and satisfactory characteristics even at low and high temperatures. The invention is an electrolytic solution that includes a cyclic carbonate (I-1) represented by formula (I-1): (in the formula, R is an alkyl group having two or more carbon atoms, a fluorine-containing alkyl group having two or more carbon atoms, an alkoxy group or a fluorine-containing alkoxy group, in which an oxygen atom may be inserted between carbon atoms); a cyclic carbonate (I-2) different from the cyclic carbonate (I-1); and an electrolyte salt (II)).

Electrolytic solution

The present invention directs to a non-aqueous electrolyte solution, including (I) at least one compound selected from the group consisting of fluorinated linear sulfones and fluorinated linear sulfonic acid esters, and (II) an electrolyte salt. Such a non-aqueous electrolyte solution has high oxidation resistance, minimizes its decomposition even when hydrofluoric acid is produced. Also, the solution is less likely to cause, in the case of being used for a secondary cell, swelling of the cell and lowering of the battery performance.

Non-aqueous electrolyte solution

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%.

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Settsu, Japan

Aoi Nakazono