Yuasa Corporation

Gs Yuasa International Ltd.

Gs Yuasa Corporation

Mitsui Chemicals, Inc.

The Kansai Electric Power Co., Inc.

The Doshisha

Hiroe Nakagawa

Syuichi Izuchi

Toshiyuki Nukuda

Tokuo Inamasu

Akihiro Fujii

Seijiro Ochiai

Masahiko Oshitani

Ryuji Shiozaki

Takehito Bogauchi

Minoru Kuzuhara

Toshiki Tanaka

Masuhiro Ohnishi

Kengo Furukawa

Yuichi Matsumura

Toshiyuki Watanabe

Keiichi Yamamoto

Daisuke Endo

Satoko Fujiyama

Takashi Hayashi

Toru Tabuchi

Masaharu Watada

Yoshinobu Yasunaga

Shigeru Sano

Suguru Kozono

Masataka Miyasato

Minoru Inaba

Yoshihiro Eguchi

Kenichi Takeuchi

Yukiko Fujino

Akira Kishimoto

Mitsuo Yamane

Tomonori Kishimoto

Yohei Shibata

Mariko Kohmoto

Yuki Fujimoto

Kazuya Okabe

Noboru Miyake

Takashi Itoh

Koji Itoh

Ryo Matsumoto

Takayuki Doi

Katsuyuki Takahashi

Takaaki Kishi

Hiroo Arai

Takashi Egawa

Toshiyuki Nukada

Takaaki Iguchi

Hidemi Yamamoto

One aspect of the present invention is a nonaqueous electrolyte for an energy storage device comprising: an alkali metal salt; a first aprotic organic solvent coordinating to an alkali metal ion in the alkali metal salt, and not including a fluorine atom; a second aprotic organic solvent including a fluorine atom; and an additive comprising a polar group and a group including a fluorine atom, wherein a content of the alkali metal salt is no less than 0.9 mol/kg and less than 2 mol/kg, a content of the first aprotic organic solvent with respect to the content of the alkali metal salt in terms of a molar ratio is no less than 0.7 and no greater than 4, and a content of the second aprotic organic solvent with respect to a total amount of the first aprotic organic solvent, the second aprotic organic solvent and the additive is no less than 40% by volume.

Nonaqueous electrolyte and nonaqueous electrolyte energy storage device

A non-aqueous electrolyte solution for a secondary battery, including a boron compound represented by Formula (1). In Formula (1), R represents an alkyl group having from 1 to 12 carbon atoms, an alkenyl group having from 2 to 12 carbon atoms, or a group represented by Formula (2). In Formula (2), each of Rto Rindependently represents a hydrogen atom, a halogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkenyl group having from 2 to 12 carbon atoms, or an aryl group having from 6 to 12 carbon atoms, and * represents a bonding site with an oxygen atom in Formula (1). 

Non-aqueous electrolyte solution for secondary battery, and secondary battery

The invention provides a polyanion-based positive active material which can improve storage stability (especially, high temperature storage stability), charge and discharge cycle performance and the like of a lithium secondary battery, and a lithium secondary battery using the same. The positive active material for a lithium ion secondary battery contains lithium iron cobalt phosphate represented by the general formula: LiFeCoPO(0&#x3c;x&#x2266;0.019, 0&#x2266;y&#x2266;1.2). By using the positive active material for a lithium secondary battery, high temperature storage stability and charge and discharge cycle performance can be improved in comparison with a case where LiFePOcontaining no Co is used. By using the positive active material, a lithium ion secondary battery can be suitable for applications in fields of electric automobiles and industrial batteries in which long lives, high capacities, and high output powers are required.

Positive active material for lithium secondary battery and lithium secondary battery

A positive active material is provided which can inhibit side reactions between the positive electrode and an electrolyte even at a high potential and which, when applied to a battery, can improve charge/discharge cycle performance without impairing battery performances even in storage in a charged state. Also provided are: a process for producing the active material; a positive electrode for lithium secondary batteries which employs the active material; and a lithium secondary battery which has improved charge/discharge cycle performance while retaining intact battery performances even after storage in a charged state and which can exhibit excellent charge/discharge cycle performance even when used at a high upper-limit voltage. The positive active material comprises: base particles able to dope and release lithium ions; and an element in Group 3 of the periodic table present on at least part of that part of the base particles which is able to come into contact with an electrolyte. It is produced by, e.g., a process which comprises: producing base particles containing lithium and able to dope and release lithium ions; and then imparting an element in Group 3 of the periodic table to the base particles so that the element can be present on at least part of that part of the base particles which is able to come into contact with an electrolyte.

Positive electrode active material and its manufacturing method, positive electrode for lithium secondary cell using same, and lithium secondary cell

The object is to provide a nonaqueous-electrolyte battery having high charge/discharge efficiency and excellent high-rate performance. This subject is accomplished by using a nonaqueous electrolyte which comprises an organic solvent and a lithium salt dissolved therein and is characterized by containing at least one quaternary ammonium salt in an amount of 0.06 mol/L or larger and 0.5 mol/L or smaller. This effect is thought to be attributable to the following mechanism: in a relatively early stage (stage in which the negative-electrode potential is relatively noble) in a first charge step, a satisfactory protective coating film is formed on the negative electrode by the action of the quaternary ammonium salt and, hence, the organic solvent employed in the nonaqueous electrolyte is inhibited from decomposing.

Nonaqueous electrolyte and nonaqueous-electrolyte battery

A positive active material is provided which can give a battery having a high energy density and excellent high-rate discharge performance and inhibited from decreasing in battery performance even in the case of high-temperature charge. Also provided is a non-aqueous electrolyte battery employing the positive active material. The positive active material contains a composite oxide which is constituted of at least lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula: LiMnNiCoO(wherein 0&#x3c;a&#x2266;1.3, |b&#x2212;c|&#x2266;0.05, 0.6&#x2266;d&#x3c;1, 1.7&#x2266;e&#x2266;2.3, and b+c+d=1). The non-aqueous electrolyte battery has a positive electrode containing the positive active material, a negative electrode, and a non-aqueous electrolyte.

Active substance of positive electrode and non-aqueous electrolyte battery containing the same

A nonaqueous electrolyte lithium secondary cell comprising a positive electrode (), a negative electrode () and a nonaqueous electrolyte containing a lithium salt is characterized by that the nonaqueous electrolyte contains a room temperature molten salt as a main component, a material wherein a working potential of the negative electrode () is nobler by above 1V than a potential of a metallic lithium is used for a negative active material of the negative electrode. This nonaqueous electrolyte lithium secondary cell has excellent safety and cell performance.

Nonaqueous electrolyte lithium secondary cell

A lithium battery excellent in initial capacity, high rate discharge performance, low temperature performance and cycle life performance can be provided without the necessity of any special production step. In other words, the present invention lies in a lithium battery having a power-generating element comprising at least a positive electrode, a negative electrode and a separator wherein a gel electrolyte comprising at least a polymer and a liquid electrolyte is used in at least a part of the power-generating element, characterized in that the concentration of lithium salt in the liquid electrolyte is from 1.5 to 5 mols per l of the liquid electrolyte.

Lithium battery including a gel electrolyte

A film-type lithium secondary battery in which at least one of a positive electrode ( ), a negative electrode ( ) and a separator ( ) contains an electrolyte having a specified structure, the electrolyte having the above specified structure is composed of a liquid electrolyte and an organic polymer, the organic polymer is formed by polymerizing an organic monomer having a polymeric functional group at its molecular chain end, the organic polymer contains in its molecule a first chemical structure and a second chemical structure, the first chemical structure is at least one of an ethylene oxide structure and a propylene oxide structure, and the second chemical structure is at least one kind selected from among an alkyl structure, a fluoroalkyl structure, a benzene structure, an ether group and an ester group.

Thin lithium secondary cell

A film-type lithium secondary battery, in which an electrolyte layer ( ) composed only of an electrolyte integrated with an electrolyte in a cathode composite ( ) is formed on a surface of the cathode composite ( ) of a positive electrode ( ), an electrolyte layer ( ) composed only of an electrolyte integrated with an electrolyte in an anode composite ( ) is formed on a surface of the anode composite ( ) of a negative electrode ( ), and the positive electrode ( ) is opposed against the negative electrode ( ) through the electrolyte layers ( & ).

Method of making a flat type lithium secondary battery and electrode

Hydrogen absorbing electrode, nickel electrode and alkaline storage

A hydrogen absorbing electrode using a hydrogen absorbing alloy including at least one or more kinds of transition metals belonging to VIIb-group, VIII-group or Ib-group in periodic table at a specified percentage, characterized in that a surface part of the hydrogen absorbing alloy forms a rich layer including the foregoing transition metals at a percentage larger than the foregoing specified percentage. Since the rich layer exists, an activation at initial stage of charge/discharge is not required. Accordingly, this electrode can be utilized effectively for a nickel-hydride secondary battery.

Hydrogen absorbing electrode and its manufacturing method

Manufacturing method of nickel plate and manufacturing method of

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Hiroe Nakagawa