Hitachi, Ltd.

Hitachi Metals, Ltd.

Hitachi Vehicle Energy, Ltd.

Shin-kobe Electric Machinery Co., Ltd.

Hiroshi Haruna

Shin Takahashi

Kazushige Kohno

Hisato Tokoro

Akira Gunji

Tatsuya Toyama

Takashi Nakabayashi

Shuichi Takano

Daiko Takamatsu

Yasutaka Tanaka

Shuichi Suzuki

Toshio Abe

Hiroshi Fukunaga

Kenji Hara

Eiji Seki

Shingo Itoh

Kento Hoshi

Yoshiaki Kumashiro

Eiji Hoshi

Naokage Tanaka

Youshin Yagi

Shuichi Wada

A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: LiNiMnCoTiMO, and has an atomic ratio Ti/Tibetween Tiand Ti, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and a are numbers satisfying &#x2212;0.1&#x2264;a&#x2264;0.2, 0.7&#x3c;b&#x2264;0.9, 0&#x2264;c&#x3c;0.3, 0&#x2264;d&#x3c;0.3, 0&#x3c;e&#x2264;0.25, 0&#x2264;f&#x3c;0.3, b+c+d+e+f=1, and &#x2212;0.2&#x2264;&#x3b1;&#x2264;0.2.

Positive-electrode material for lithium ion secondary battery, method for producing the same, and lithium ion secondary battery

A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: LiNiMnCoTiMO, and has an atomic ratio Ti/Tibetween Tiand Ti, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and &#x3b1; are numbers satisfying &#x2212;0.1&#x2264;a&#x2264;0.2, 0.7&#x3c;b&#x2264;0.9, 0&#x2264;c&#x3c;0.3, 0&#x2264;d&#x3c;0.3, 0&#x3c;e&#x2264;0.25, 0&#x2264;f&#x3c;0.3, b+c+d+e+f=1, and &#x2212;0.2&#x2264;&#x3b1;&#x2264;0.2.

Positive-electrode material for lithium ion secondary battery, method and producing the same, and lithium ion secondary battery

Provided are a lithium secondary battery having improved initial capacity and excellent cycle property, an electrolyte solution for the lithium secondary battery, and an additive for the electrolyte solution for the lithium secondary battery. The lithium secondary battery includes positive and negative electrodes both having a lithium-ion intercalation/de-intercalation ability, and a non-aqueous electrolyte solution contacted with the positive and negative electrodes. The non-aqueous electrolyte solution contains lithium hexafluorophosphate and a boroxine compound represented by (RO)(BO)liquefying at 25&#xb0; C. R(s) each independently represent an organic group of a linear chain alkyl group having 3 or more carbon atoms. Herein, the chain alkyl group may have a branch, and when the branch is included, the number of carbon atoms of the chain alkyl group constructing a linear portion thereof is 3 or more.

Lithium secondary battery, electrolyte solution for lithium secondary battery, and additive for electrolyte solution therefor

Disclosed is an electrolyte solution used for a lithium secondary battery having high capacity, less undergoing aging deterioration of capacity, and also excellent in life characteristic. The electrolyte solution used for a lithium secondary battery contains a compound having a trivalent or higher boron formed by incorporation of a boroxine compound represented by (RO)(BO)in which R(s) each represent independently an organic group of 1 to 6 carbon atoms and LiPF, and a non-aqueous solvent.

Electrolyte solution for lithium secondary battery and lithium secondary battery

The invention addresses the problem of providing a lithium ion secondary battery excellent in initial charge-discharge characteristics and life characteristics. To solve the above problem, the invention provides a lithium ion secondary battery in which an electrode group having a positive electrode and a negative electrode is housed in a battery can, wherein the negative electrode includes a negative electrode active material supported on a negative electrode foil, and the negative electrode active material includes cores having SiO as a main component, a composite oxide coating layer of Fe and SiOdisposed on the periphery of each of the cores, and a carbon coating layer disposed on the periphery of the composite oxide coating layer of Fe and SiO.

Negative electrode material, negative electrode for lithium ion secondary battery, lithium ion secondary battery, and method of manufacturing the same

A nonaqueous electrolyte and a lithium ion battery with reduced temporal variations in battery characteristics from initial values are provided. A mixed solution is prepared by dissolving a lithium salt such as LiPFin a nonaqueous solvent such as ethylene carbonate. Allylboronate ester and siloxane are mixed with the mixed solution. The content of the allylboronate ester is 1 wt % or less. The content of the siloxane is 2 wt % or less. 2-Allyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane is used as the allylboronate ester. At least one kind selected from hexamethyldisiloxane and 1,3-divinyltetramethyldisiloxane is used as the siloxane.

Nonaqueous electrolyte solution and lithium ion battery

To provide a lithium secondary battery which suppresses a decrease in the charge and discharge efficiency during a battery storage test and which is excellent in maintaining the battery capacity after the storage test. There are disclosed a nonaqueous lithium battery, comprising: a positive electrode active material comprising a lithium-containing oxide capable of inserting and detaching lithium ions; a negative electrode active material comprising a carbon material capable of inserting and detaching lithium ions; and an electrolytic solution containing a lithium ion, wherein the surface of the negative electrode active material after initializing charging is coated with a compound derived from vinylene carbonate, and wherein a weight power density of the lithium battery is no less than 100 Wh/kg, and a method of producing a nonaqueous lithium battery comprising a step of sealing a positive electrode active material, a negative electrode active material, and a nonaqueous electrolytic solution using a sealed container, wherein a predetermined amount of vinylene carbonate is added into the nonaqueous electrolytic solution, and the initializing charging is carried out to form a coating on the surface of the negative electrode active material, the coating being derived from the vinylene carbonate.

Lithium secondary battery and production method of the same

The present invention provides a battery that experiences a small degree of temporal change from the initial battery properties over the long term storage period of the battery. Specifically, the present invention provides a lithium secondary battery, in which a positive electrode capable of storing and releasing lithium and a negative electrode capable of storing and releasing lithium are formed via an electrolyte, wherein: the electrolyte comprises a cyclic solvent and a chain-type solvent and contains a compound having a boron-oxygen bond (B&#x2014;O) and a carbon-carbon double bond (C&#x2550;C).

Lithium secondary battery

Using a positive electrode active material including spinel type manganese oxide as the main constituent, a novel low cost and high output power flat type nonaqueous secondary cell for HEVs that has increased safety at overcharge, and superior storage properties and cycle life is provided. A flat type nonaqueous secondary cell that has increased safety and is superior in storage and cycle properties even though the cell is a laminate type cell which does not have a blocking mechanism can be obtained by blending the spinel type lithium manganese oxide of the positive electrode and 5 wt % to 40 wt % of layered type lithium manganese oxide, to suppress storage deterioration at a high temperature and to simultaneously achieve safety when overcharged, and further, by adding a Li compound having a structure as shown in Formula (1) structure, to suppress deterioration of a mixed positive electrode active material during a high temperature cycle.

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Tokyo, Japan

Hiroshi Haruna