Kabushiki Kaisha Toyota Jidoshokki

Gunma University

Arakawa Chemical Industries, Ltd.

The University of Tokyo

Manabu Miyoshi

Keiichi Hayashi

Hitotoshi Murase

Yuichi Hirakawa

Megumi Yamamoto

Hideaki Shinoda

Takayuki Kato

Tatsuya Eguchi

Kayo Mizuno

Yoshikatsu Kawabata

Katsufumi Tanaka

Kyoichi Kinoshita

Nobuhiro Goda

Junichi Niwa

Hiroki Oshima

Atsushi Saito

Tomokuni Abe

Jun Kaneda

Yuuhi Sato

Takayuki Hirose

Takahiro Sugioka

Yuki Yamada

Atsuo Yamada

Eiji Kono

Takashi Yoshida

Shinji Suzuki

Tomohei Sugiyama

Hirokuni Akiyama

Tomoyuki Kawai

Yoshihiro Nakagaki

Akira Kojima

Toshio Otagiri

Kohei Mase

Yusuke Yamamoto

Takeshi Maki

Hidehiro Kudo

Shin-ichi Tobishima

Hideyuki Morimoto

Yuya Sato

Kensuke Yotsumoto

Yushi Kondo

Kazuhiro Izumoto

Kisena Yoshida

Hideaki Ishikawa

Yuki Hasegawa

Shin-Ichi Tobishima

Hideki Goda

The negative electrode includes a current collector, a negative electrode active material layer arranged on a surface of the current collector, and a protective layer arranged on a surface of the negative electrode active material layer. The negative electrode active material layer includes a first negative electrode active material having an aspect ratio defined as 'a'/'b' to fall in a range of from two or more to eight or less when a length of the major axis is defined &#x201c;a&#x201d; and a length of the minor axis is defined &#x201c;b.&#x201d; The protective layer includes a ceramic powder.

Negative electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

It is an assignment to be solved to provide an electrode for secondary battery, electrode in which the active material is suppressed from coming off or falling down from the electricity collector, and that has excellent cyclic performance. It is characterized in that, in an electrode for secondary battery, the electrode being manufactured via an application step of applying a binder resin and an active material onto a surface of electricity collector, said hinder resin is an alkoxysilyl group-containing resin that has a structure being specified by formula (I): 

Process for manufacturing electrode for secondary battery

A positive electrode for lithium-ion secondary battery includes: a lithium metallic oxide with a lamellar rock-salt structure including nickel, cobalt, and manganese; and a phosphate/carbon composite including an olivine-type phosphate compound at least some of which is coated with carbon partially. A rate of a volume resistivity of the phosphate/carbon composite to a volume resistivity of the lithium metallic oxide is 0.034 or less. The olivine-type phosphate compound is expressed by a general formula: LiMPO(where 'M' is at least one element selected from the group consisting of Mn, Fe, Co, Ni, Cu, Mg, Zn, V, Ca, Sr, Ba, Ti, Al, Si, B, Te and Mo, and 0&#x3c;'h'&#x3c;2). A content of the phosphate/carbon composite is from 15% by mass or more to 35% by mass or less when a summed mass of the lithium metallic oxide and the phosphate/carbon composite is taken as 100% by mass.

Positive electrode for lithium-ion secondary battery, production process for the same, and lithium-ion secondary battery

Providing a silicon-containing material having a novel structure being distinct from the structure of conventional silicon oxide disproportionated to use. A silicon-containing material according to the present invention includes at least the following: a continuous phase including silicon with Si&#x2014;Si bond, and possessing a bubble-shaped skeleton being continuous three-dimensionally; and a dispersion phase including silicon with Si&#x2014;O bond, and involved in an area demarcated by said continuous phase to be in a dispersed state.

Silicon-containing material and secondary-battery active material including silicon-containing material

A negative-electrode material has negative-electrode active-material particles including: an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and an elementary compound being capable of undergoing an alloying reaction with lithium. The negative-electrode active-material particles includes particles whose particle diameter is 1 &#x3bc;m or more in an amount of 85% by volume or more of them when the entirety is taken as 100% by volume, exhibit a BET specific surface area that is 6 m/g or less, and exhibits a 'D' that is 4.5 &#x3bc;m or more.

Negative-electrode material and negative electrode for use in lithium-ion secondary battery as well as lithium-ion secondary battery

A negative electrode for lithium-ion secondary battery including a negative electrode that includes a current collector; and a negative-electrode active-material layer formed on a surface of the current collector, and including negative-electrode active-material particles. The negative-electrode active-material particles include an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and an elementary compound being capable of undergoing an alloying reaction with lithium, the negative-electrode active-material particles include particles whose particle diameter is 1 &#x3bc;m or more in an amount of 85% by volume or more thereof when the entirety is taken as 100% by volume, and exhibit a 'D' being 3 &#x3bc;m or more. The negative-electrode active-material layer having a thickness that is 1.4 times or more of a 'D' that said negative-electrode active-material particles exhibit.

Negative-electrode stuff and negative electrode for use in lithium-ion secondary battery as well as lithium-ion secondary battery

A lithium-ion secondary battery including a negative electrode including negative-electrode active-material particles including an element being capable of sorbing and desorbing lithium ions, and being capable of alloying with lithium; or/and an elementary compound including an element that is capable of alloying with lithium; a positive electrode including a positive-electrode active material that enables Li ions to be sorbed therein and desorbed therefrom; and an electrolytic solution made by dissolving an electrolyte in a solvent. The negative-electrode active-material particles include particles whose particle diameter is 1 &#x3bc;m or more in an amount of 85% by volume or more thereof when the entirety of said negative-electrode active-material particles, which are included in said negative electrode, is taken as 100% by volume, and the negative-electrode active-material particles exhibit a 'D' being 3 &#x3bc;m or more. The solvent in the electrolytic solution includes a fluorinated ethylene carbonate.

It is an assignment to provide the following: a negative-electrode material for electric storage device, a negative electrode for electric storage device, and an electric storage device, negative-electrode material, negative electrode and electric storage device in which SiOis used as a negative-electrode active material, which excel in the conductivity, and which can inhibit the discharge capacity from declining; as well as a vehicle having the electric storage device on-board. In the negative-electrode material for electric storage device, acetylene black is used as a conductive additive; and, when a sum of contents of SiO, graphite, conductive additive and a binder resin is taken as 100% by mass, the contents are made so as to be as follows: a content of a negative-electrode active material including the SiOand graphite is 70% by mass or more; the content of the SiOis from 17% by mass or more and 40% by mass or less; a sum of the contents of the conductive additive and binder resin is from 8% by mass or more to 20% by mass or less; and the content of the conductive additive is from 6% by mass or more to 12% by mass or less.

Negative electrode material for electric storage device, negative electrode for electric storage device, electric storage device, and vehicle

Provided is a negative-electrode active material, which is capable of constituting a lithium ion secondary cell exhibiting excellent cell characteristics. The negative-electrode active material for a lithium ion secondary cell of the invention includes a mixed material of silicon oxide particles composed of silicon oxide and rod-shaped iron oxide particles composed of iron oxide. It is preferable to use iron oxide particles having a plurality of pores in a surface, and an electrode reaction is effectively carried out.

Lithium ion secondary cell

A parameter for producing a positive electrode having excellent safety, and a positive electrode active material layer satisfying the parameter. The positive electrode active material layer includes a first positive electrode active material, a second positive electrode active material having a lower charge/discharge potential than the first positive electrode active material, and an additive. When the first positive electrode active material tap density is defined as dt, the second positive electrode active material tap density is defined as dt, a true density of the additive is defined as d, a mass percentage of the first positive electrode active material is defined as Wt, a mass percentage of the second positive electrode active material is defined as Wt, a mass percentage of the additive is defined as Wt, and a porosity of the positive electrode active material layer is defined as p, the positive electrode active material layer satisfies (1&#x2212;p)&#xd7;(Wt/dt)/((Wt/dt)+(Wt/dt)+(Wt/d))&#x3c;0.38.

Positive electrode active material layer including first positive electrode active material and second positive electrode active material, and method for producing positive electrode including said positive electrode active material layer

Provided is a negative electrode for a nonaqueous secondary battery which achieves both suppression of reductive decomposition of an electrolyte or an electrolytic solution and suppression of an increase in resistance. Also provided are a method for producing such a negative electrode and a nonaqueous secondary battery employing such a negative electrode. A polymer coating layer is formed so as to coat at least part of surfaces of negative electrode active material particles containing silicon oxide (SiO; 0.5&#x2266;x&#x2266;1.6). The polymer coating layer contains a cationic polymer having a positive zeta potential under neutral conditions. Since silicon oxide has a negative zeta potential, a thin uniform coating layer can be formed owing to Coulomb's force.

Negative electrode for nonaqueous secondary battery, method for producing the same, and nonaqueous secondary battery

Provided is a negative electrode active material containing SiOand carbonaceous particles containing graphite and having both good discharge capacity and good electric conductivity. Also provided is a negative electrode using the negative electrode active material and a nonaqueous electrolyte secondary battery. When the carbonaceous particles have an average particle diameter Dof &#x3b1; (&#x3bc;m) and a BET specific surface area of &#x3b2; (m/g), the &#x3b1; and the &#x3b2; satisfy the following Formulae (1) and (2).&#x3b2;&#x2266;&#x2212;(12/18)&#x3b1;+12&#x2003;&#x2003;(1)5&#x2266;&#x3b1;&#x2266;15&#x2003;&#x2003;(2).

Negative electrode active material, negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

To provide a lithium ion secondary battery electrode in which a coated layer is held on a surface of an active material layer over a long period of time to suppress decomposition of the electrolysis solution and to enhance the cyclability, a manufacturing process for the same, and a lithium ion secondary battery using the electrode. A lithium ion secondary battery electrode includes a current collector, an active material layer containing a binder formed on a surface of the current collector, and a coated layer formed on the surface of at least a part of the active material layer, wherein the coated layer is an acrylic type copolymer cured substance including an acrylic type main chain and a side chain having polyester or polyether graft-polymerized to the acrylic type main chain and the coated layer is chemically bonded with the binder.

Lithium secondary battery electrode including coated layer having acrylic copolymer chemically bonded to binder of active material layer and manufacturing process for the same

To provide a lithium ion secondary battery electrode in which a coated layer is held on a surface of an active material layer over a long period of time to suppress decomposition of the electrolysis solution and to enhance the cyclability, a manufacturing process for the same, and a lithium ion secondary battery using the electrode. A lithium ion secondary battery electrode includes a current collector, an active material layer containing a binder formed on a surface of the current collector, and a coated layer formed on the surface of at least a part of the active material layer, wherein the coated layer contains a silicone-acrylic graft copolymer cured substance including an acrylic type main chain having a functional group and a side chain having a silicone graft-polymerized to the acrylic type main chain, and the coated layer is chemically bonded with the binder.

Lithium ion secondary battery electrode, manufacturing process for the same, and lithium ion secondary battery using the electrode

To provide a lithium ion secondary battery electrode in which a coat is held on a surface of an active material layer over a long period of time to suppress decomposition of the electrolysis solution and to enhance the cyclability, a manufacturing process for the same, and a lithium ion secondary battery using the electrode. A lithium ion secondary battery electrode includes a current collector, an active material layer containing a binder formed on a surface of the current collector, and a coat containing modified polydimethylsiloxane formed on a surface of at least a part of the active material layer, wherein the coat is chemically bonded with the binder.

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Kariya, Japan

Manabu Miyoshi