Tdk Corporation

Namco Limited

Tsuyoshi Iijima

Satoshi Maruyama

Kazuya Ogawa

Atsushi Sano

Tadashi Suzuki

Toshinobu Miyakoshi

Makoto Kobayashi

Jun-ichi Satoh

Tetsuya Takahashi

Toshifumi Tanaka

Shinichi Odake

Eiichi Saita

Atushi Sano

A lithium-ion secondary battery device comprises a positive electrode collector having a surface formed with a positive electrode active material layer containing a positive electrode active material; a negative electrode collector having a surface formed with a negative electrode active material layer containing a negative electrode active material; an electrically insulating porous separator; and an electrolyte containing a lithium salt and being in contact with the positive electrode active material layer, negative electrode active material layer, and separator. The negative electrode active material is a carbon material having a graphite structure. The amount of the carbon material supported by the negative electrode active material layer is 2.0 to 4.0 mg/cm. The graphite structure in an X-ray diffraction pattern of the carbon material exhibits a peak intensity P101 of (101) plane and a peak intensity P100 of (100) plane having a ratio (P101/P100) of 2.0 to 2.8 therebetween.

Lithium-ion secondary battery and method of charging lithium-ion secondary battery

The positive electrode active material in accordance with the present invention is used for a positive electrode for a lithium-ion secondary battery, includes Li, Mn, Ni, Co, and O atoms, and has a substantially halite type crystal structure. Specifically, it is preferably expressed by LiMnNiCoO, where a is 0.85 to 1.1, b is 0.2 to 0.6, c is 0.2 to 0.6, d is 0.1 to 0.5, and e is 1 to 2 (the sum of b, c, and d being 1). Because of such composition and crystal structure, the positive electrode active material of the present invention reduces the amount of elution of the battery into the liquid electrolyte and enhances the stability at a high temperature.

Electrode active material, electrode, lithium-ion secondary battery, method of making electrode active material, and method of making lithium-ion secondary battery

A lithium secondary battery comprising positive and negative electrodes both capable of occluding and releasing lithium ions, and a lithium ion conductive material which contains a compound of formula (1) exhibits improved characteristics including charge/discharge efficiency, low-temperature properties and cycle performance when (a) only one substituent group of R, R, Rand Rin formula (1) is alkyl, (b) the negative electrode-constituting material partially contains a carboxyl or hydroxyl group-bearing compound, and the lithium ion conductive material contains propylene carbonate, or (c) a positive electrode active material is a lithium-containing transition metal compound, a negative electrode active material is a carbonaceous material, and the lithium ion conductive material contains as a non-aqueous electrolysis solution a solvent mixture of propylene carbonate and ethylene carbonate in combination with a chain-like carbonate as a low-viscosity solvent. 

Lithium secondary battery

A lithium ion secondary battery, having a positive electrode, a negative electrode, and a separator provided between the positive electrode and the negative electrode, the positive electrode and the negative electrode each having a collector and an active material layer provided over the collector, and the relationship Ts&#x2267;4Tc being satisfied, where Ts is the puncture strength of the separator, and Tc is the puncture strength of the collector of the positive electrode and/or the negative electrode.

Lithium ion secondary battery

A nonaqueous solvent in a nonaqueous electrolytic solution in a lithium-ion secondary batterycontains propylene carbonate (PC), a first compound expressed by formula (I), and a second compound expressed by formula (II). The content of PC in the nonaqueous solvent is at least 10 volume %. The content X [mass %] of the first compound and the content Y [mass %] of the second compound simultaneously satisfy the conditions represented by expressions (1) and (2) [2&#x2266;(X+Y)&#x2266;8 (1), 0.01&#x2266;(Y/X)&#x2266;0.30 (2)]. Rto Rin formula (I) indicate any of a hydrogen atom and hydrocarbon groups having a carbon number of 1 to 3, whereas Rand Rin formula (II) indicate any of a hydrogen atom and hydrocarbon groups having a carbon number of 1 to 3. 

Nonaqueous electrolytic solution and lithium-ion secondary battery

A lithium ion secondary battery having a positive electrodewhich contains, as a positive electrode active material, a composite metal oxide containing at least one of Li, Co, Mn, and Ni as a metal component thereof; a negative electrodewhich contains a negative electrode active material; and a nonaqueous electrolyte solution containing a lithium salt. A charging method is characterized in that constant-current charging is performed with use of a set charging current value of equal to or greater than 0.5C and less than 2C ('C' referred to here is a rated capacity value of said lithium ion second battery).

Lithium ion secondary battery and charging method therefor

A lithium secondary battery comprising positive and negative electrodes both capable of occluding and releasing lithium ions, and a lithium ion conductive material which contains a compound of formula (1) exhibits improved characteristics including charge/discharge efficiency, low-temperature properties and cycle performance when (a) only one substituent group of R, R, Rand Rin formula (1) is alkyl, (b) the negative electrode-constituting material partially contains a carboxyl or hydroxyl group-bearing compound, and the lithium ion conductive material contains propylene carbonate, or (c) a positive electrode active material is a lithium-containing transition metal compound, a negative electrode active material is a carbonaceous material, and the lithium ion conductive material contains as a non-aqueous electrolysis solution a solvent mixture of propylene carbonate and ethylene carbonate in combination with a chain-like carbonate as a low-viscosity solvent 

A cathode, an anode and a porous film are first provided. Then, the cathode and anode are aligned with the porous film and a part of the cathode and a part of the anode are fixed to said porous film. Then, the cathode, anode and porous film are immersed in a liquid electrolyte. Finally, the cathode and anode are integrated with the porous film by compression. With this process, it is possible to produce a thin and lightweight polymer secondary battery or other secondary batteries with ease yet at low cost.

Secondary battery, and its production process

The method of charging a lithium ion secondary battery uses a lithium ion secondary battery comprising a positive electrode including a mixed metal oxide containing at least Li, Mn, and Ni as metal components as a positive electrode active material, a negative electrode, and a nonaqueous electrolytic solution containing a lithium salt; and includes a constant current charging step of carrying out constant current charging with a set charging current value Icorresponding to a set value nC satisfying the condition represented by the expression of 2C&#x2266;nC&#x2266;60C, where C is a rated capacity value of the lithium ion secondary battery, and n is a number of 2 to 60.

Method of charging lithium ion secondary battery including a constant current, charging apparatus, and power supply apparatus

In a lithium secondary battery comprising positive and negative electrodes each comprising at least an active material capable of occluding and releasing lithium ions, a binder and a current collector, and an electrolytic solution, the active material in the positive and/or negative electrode has been made conductive by coating its surface with a conductive agent and a binder, and affixed to the surface of the collector by a dry process. The lithium secondary battery is given a higher energy density and a higher output density and will find a wider range of application.

The invention aims to provide a lithium secondary battery exhibiting the improved function of self safety in an abnormal state without sacrificing battery characteristics. To attain the object, in a lithium secondary battery comprising a positive electrode (), a negative electrode (), an electrolytic solution, and a separator, a plurality of positive electrodes () and negative electrodes () are arranged to construct an electrode structure which includes an outermost layer of electrode on which a back coat layer () is formed.

Ranking display method for a game machine wherein, when a score along with an E mail address is inputted from a personal computer, a server stores the inputted score and E mail address, and when there is a change in ranking of score, the server transmits a message by E mail to the corresponding personal computer.

Ranking display method for game machine

An electrochemical device includes an envelope having a sealable opening and a resin layer on its inner side and an electrochemical element having terminals, wherein the electrochemical element is inserted in the envelope through the opening and sealed therein. A strip of a material different from the resin layer is disposed in the envelope opening and sealed together by thermal fusion so that the strip serves as a pressure relief valve for relieving pressure within the envelope.

Growing community of inventors

Tokyo, Japan

Tsuyoshi Iijima