Mitsubishi Chemical Corporation

Fuji Jukogyo Kabushiki Kaisha

Nisshin Steel Co., Ltd.

Mitsubishi Petrochemical Company Limited

Nissan Motor Company Limited

C.uyemura Co., Ltd.

A&t Battery Corporation

Mu Ionic Solutions Corporation

Hitoshi Suzuki

Minoru Kotato

Ryoichi Kato

Shoichiro Mori

Noriko Shima

Kazuhiko Ida

Isao Saeki

Takashi Fujii

Fujio Matsui

Masaaki Ohgami

Tomohiro Sato

Setsuko Takahashi

Hidekazu Miyagi

Hirofumi Suzuki

Hiroki Yasuda

Hiroyuki Oshima

Jun Sasahara

Takayuki Nakajima

Takahiro Yamamoto

Shinichi Kinoshita

Hideharu Sato

Akira Yajima

Shigeru Ando

Kazuo Hara

Makoto Ue

Masahiro Takehara

Takuro Morozumi

Hitoshi Matsumoto

Shinji Kamimaru

Kenji Okahara

Daisuke Noda

Hiroyuki Uono

Masakazu Yokomizo

Kouji Morikawa

Asao Kominato

Katsuhiko Ohara

Tomohiro Satou

Shuji Sawafuji

Seteuko Takahashi

Takayuki Kawahara

Tokuro Morozumi

Marc Deshamps

Hitoshi Ota

Kikuko Tanaka

Kayoko Oku

A difluorophosphate effective as an additive for a nonaqueous electrolyte for secondary battery is produced by a simple method from inexpensive common materials. The difluorophosphate is produced by reacting lithium hexafluorophosphate with a carbonate in a nonaqueous solvent. The liquid reaction mixture resulting from this reaction is supplied for providing the difluorophosphate in a nonaqueous electrolyte comprising a nonaqueous solvent which contains at least a hexafluorophosphate as an electrolyte lithium salt and further contains a difluorophosphate. Also provided is a nonaqueous-electrolyte secondary battery employing this nonaqueous electrolyte.

Method for producing difluorophosphate, non-aqueous electrolyte for secondary cell and non-aqueous electrolyte secondary cell

A lithium secondary battery comprising: a positive electrode and a negative electrode which each has a specific composition and specific properties; and a nonaqueous electrolyte which contains a cyclic siloxane compound represented by general formula (1), fluorosilane compound represented by general formula (2), compound represented by general formula (3), compound having an S&#x2014;F bond in the molecule, nitric acid salt, nitrous acid salt, monofluorophosphoric acid salt, difluorophosphoric acid salt, acetic acid salt, or propionic acid salt in an amount of 10 ppm or more of the whole nonaqueous electrolyte. This lithium secondary battery has a high capacity, long life, and high output. [In general formula (1), Rand Rare an organic group having 1-12 carbon atoms and n is an integer of 3-10. In general formula (2), Rto Rare an organic group having 1-12 carbon atoms; x is an integer of 1-3; and p, q, and r each are an integer of 0-3, provided that 1&#x2266;p+q+r&#x2266;3. In general formula (3), Rto Rare an organic group having 1-12 carbon atoms and symbol A is a group constituted of H, C, N, O, F, S, Si, and/or P.]

Lithium secondary batteries and nonaqueous electrolyte for use in the same

A lithium secondary battery is provided. The battery comprises: a positive electrode and a negative electrode which each has a specific composition and specific properties; and a nonaqueous electrolyte which contains a cyclic siloxane compound of formula (1), a fluorosilane compound of formula (2), a compound of formula (3), compound having an S&#x2014;F bond in the molecule, nitric acid salt, nitrous acid salt, monofluorophosphoric acid salt, difluorophosphoric acid salt, acetic acid salt, or propionic acid salt in an amount of 10 ppm or more of the whole nonaqueous electrolyte. 

The present invention provides a simple method for producing a difluorophosphate from a source material, the difluorophosphate being useful as additives for nonaqueous electrolyte solutions for secondary batteries. In the method, a source material containing a carbonate and/or a borate is allowed to react with a source gas which contains P and F and which may further contain O as required. The source material may contain lithium carbonate. The source gas may be produced by decomposing LiPF. The source gas may be produced in such a manner that LiPFand lithium carbonate are mixed and then subjected to reaction. The nonaqueous electrolyte solution contains the product obtained from the reaction.

Method for producing difluorophosphate, nonaqueous electrolyte solution for secondary batteries, and nonaqueous electrolyte secondary battery

Method for producing difluorophosphate, nonaqueous electrolyte solution for secondary battery and nonaqueous electrolyte secondary battery

A nonaqueous electrolyte solution for secondary batteries which is an electrolyte solution for secondary batteries obtained by dissolving a lithium salt in a nonaqueous solvent, wherein the nonaqueous solvent is a solvent mainly comprising a lactone compound and the content of hydroxy carboxylic acids in the electrolyte solution is 1 mmol/kg or lower and a secondary battery employing the same are excellent in high-temperature storage characteristics, cycle characteristics, and capacity retention characteristics and in various cell characteristics in a wide temperature range and safety such as firing properties.

Nonaqueous electrolyte solution and secondary battery employing the same

A non-aqueous secondary battery having an electrode group and a non-aqueous electrolytic solution, characterized in that: (1) the electrode group is contained in a casing made of a sheet having a resin layer with a thickness of 0.5 mm or less, (2) the non-aqueous solvent contains &#x3b3;-butyrolactone, ethylene carbonate, at least one vinylene carbonate compound and at least one vinylethylene carbonate compound, (3) the amounts of the vinylene carbonate compound, the vinylethylene carbonate compound and sum total of both are, respectively, 0.01 to 5% by weight, 0.01 to 5% by weight and 0.02 to 6% by weight, based on the total weight of the non-aqueous solvent, and (4) the amounts of the &#x3b3;-butyrolactone and the ethylene carbonate are, respectively, 50% by volume or more and 10% by volume or more, based on the total volume of the non-aqueous solvent.

Non-aqueous electrolytic secondary battery

A non-aqueous electrolyte secondary battery comprising a negative electrode, a positive electrode and an electrolyte having a lithium salt dissolved in a non-aqueous solvent characterized in that said non-aqueous solvent contains a vinylethylene carbonate compound represented by the general formula (I) in an amount of from 0.01 to 20% by weight is subject to minimized decomposition of the electrolyte and can provide a high capacity as well as exhibits excellent storage properties and cycle life performance.wherein R, R, R, R, Rand Reach independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

Nonaqueous electrolytic solution type secondary battery

There are disclosed a non-aqueous electrolyte which comprises a non-aqueous organic solvent and a lithium salt, and further contains a compound represented by the following formula (I):wherein X represents &#x2014;O&#x2014;, &#x2014;S&#x2014;, &#x2014;CO&#x2014; or &#x2014;SO, Y represents a single bond, &#x2014;CH&#x2014;, &#x2014;CH&#x2014;CH&#x2014;, &#x2014;CH&#x2550;CH&#x2014; or &#x2014;CO&#x2014; and Rto Reach independently represent a hydrogen atom, an alkyl group, a phenyl group, or a halogen group, provided that X and Y do not represent &#x2014;CO&#x2014; at the same time.

Nonaqueous electrolytic solution and secondary battery containing the same

A nonaqueous electrolytic solution cell having a negative electrode containing lithium as an active material, a positive electrode, a nonaqueous electrolytic solution consisting of solute and organic solvent, a separator, and an outer can, wherein the organic solvent contains a compound having an S&mdash;O bond, and a current collector for the positive electrode and an electrolytic solution-contacting portion on the positive electrode side of the outer can are made of valve metal or alloy thereof is disclosed. The nonaqueous electrolytic solution cell of the present invention is excellent in low-temperature characteristics and long-term stability, and also in cycle characteristics for use as a secondary battery.

Non-aqueous electrolyte cell with a solvent including a S-O bond

Disclosed is a non-aqueous electrolytic solution secondary cell having a negative electrode containing a carbonaceous material capable of occluding and liberating lithium, a positive electrode, a non-aqueous electrolytic solution which includes a solute and an organic solvent, and a separator; wherein the organic solvent contains at least one of compounds selected from those expressed by the formulae (I) and (II) below (in which &phgr; represents a phenyl group optionally having an alkyl group; and R represents any one of a hydrogen atom, C alkyl groups and a phenyl group optionally having an alkyl group). Such non-aqueous electrolytic solution secondary cell of the present invention is successful in suppressing decomposition of the electrolytic solution, and achieving a high capacity and excellent cycle characteristics.

Secondary battery having nonaqueous electrolyte solution

There are disclosed a process for preparing an ambient temperature molten salt, which comprises treating an ambient temperature molten salt consisting essentially of 20 to 50 mole % of an aluminum halide and 80 to 50 mole % of an onium halide, containing oxygen-containing impurities originating from water with thionyl chloride and a process for preparing an ambient temperature molten salt for effecting aluminum electroplating, which comprises treating mixed ambient temperature molten salts consisting essentially of 30 to 50 mole % of an aluminum halide and 70 to 50 mole % of an onium halide, containing oxygen-containing impurities originating from water with thionyl chloride, and then adding aluminum halide to the molten salt to prepare an ambient temperature molten salt composition consisting essentially of 50 to 80 mole % of an aluminum halide and 50 to 20 mole % of an onium halide.

Process for preparing an ambient temperature molten salt using thionyl

There is disclosed a method for producing an ambient temperature molten salt comprising at least one of 1,3-dialkylimidazolium halide, 1,2,3-trialkylimidazolium halide and N-alkylpyridinium halide, and an aluminum halide, which comprises suspending the above starting materials in an inert solvent having a low boiling point to carry out a complex forming reaction.

Method for producing ambient temperature molten salt consisting of

A control system for an internal combustion engine having an air pump provided in an intake passage for supplying air into a cylinder of the engine. A continuously variable belt-drive automatic transmitting device is provided between a crankshaft of the engine and a drive shaft of the air pump. The transmitting device control unit is controlled by a control unit in accordance with operating conditions of the engine. A throttle valve is provided upstream of the air pump.

Control system for a supercharged internal combustion engine

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Inashiki-gun, Japan

Hitoshi Suzuki