Patent application number | Description | Published |
20080199775 | BATTERY, EXAMINATION METHOD AND MANUFACTURING METHOD FOR NEGATIVE ELECTRODE THEREOF, AND EXAMINATION APPARATUS AND MANUFACTURING APPARATUS FOR NEGATIVE ELECTRODE THEREOF - In a method for examining a negative electrode of a battery, a total thickness of a current collector and an active material layer is measured. Then, in order to estimate a composition of the active material layer, the total resistivity of the current collector and the active material layer is measured. | 08-21-2008 |
20080248189 | MANUFACTURING METHOD OF ELECTRODE FOR ELECTROCHEMICAL ELEMENT - The invention presents a manufacturing method of an electrode for an electrochemical element for inserting and extracting a lithium ion reversibly, comprising; forming a concave portion and a convex portion at least on one side of a current collector, preparing a raw material containing a element for composing an active material, introducing a specified supply amount of the raw material and a carrier gas into a film forming device to form a plasma, and injecting the plasma of the raw material on the current collector, in which the active material is grown on the convex portion of the current collector, and a columnar body is formed by covering at least a part of respective sides of the convex portion. | 10-09-2008 |
20080248388 | ELECTRODE FOR ELECTROCHEMICAL ELEMENT AND ELECTROCHEMICAL ELEMENT USING THE SAME - The invention presents an electrode for an electrochemical element for inserting and extracting a lithium ion reversibly, comprising a current collector forming a concave portion and a convex portion at least on one side, and a columnar body including an active material formed on the convex portion of the current collector, in which the columnar body covers at least a part of respective sides of the convex portion. By this configuration, an electrode for an electrochemical element of long life and excellent reliability is realized. | 10-09-2008 |
20080254353 | ELECTROCHEMICAL DEVICE, MANUFACTURING METHOD OF ELECTRODE THEREOF AND PROCESSING APPARATUS FOR ELECTRODE OF ELECTROCHEMICAL DEVICE - According to a method for manufacturing an electrode of an electrochemical device, an electrode precursor capable of absorbing and releasing lithium is provided with lithium, and the resistance of the electrode precursor is measured after absorbing lithium. In addition, a processing apparatus for an electrode of an electrochemical device includes a lithium providing section for providing lithium to such an electrode precursor, and a first measurement section for measuring the resistance of the electrode precursor after absorbing lithium. | 10-16-2008 |
20090017375 | NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - A non-aqueous electrolyte secondary battery of the present invention includes a positive electrode including a positive electrode material mixture, a negative electrode including a negative electrode material mixture, and a non-aqueous electrolyte including a non-aqueous solvent and a first lithium salt and a second lithium salt dissolved in the non-aqueous solvent. The negative electrode material mixture includes a material capable of absorbing and desorbing lithium ions, and carbon nanofibers. The material capable of absorbing and desorbing lithium ions has a ratio A/B of a volume A in a charged state to a volume B in a discharged state of 1.2 or more. The first lithium salt is at least one selected from the group consisting of LiBF | 01-15-2009 |
20090042097 | NEGATIVE ELECTRODE CURRENT COLLECTOR FOR LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY - A lithium ion secondary battery includes a negative electrode that is shaped like waves in a section in the thickness direction. In the negative electrode, the ratio t | 02-12-2009 |
20090098451 | LITHIUM ION SECONDARY BATTERY - In a lithium ion secondary battery including a flat-plate electrode assembly which is configured by stacking the positive electrode, the separator, and the negative electrode in the thickness direction thereof, each of the positive electrode and the negative electrode includes a current collector and an active material layer. Each of the current collector includes a substantially rectangular current collector body, a heat radiating portion, and a lead portion, and the heat radiating portions are projected toward the outside of the electrode assembly so as not to overlap with each other in the thickness direction of the electrode assembly. In this way, heat caused inside the lithium ion secondary battery can be diffused efficiently to the outside, and safety of the lithium ion secondary battery can be further increased, without complicating the battery structure and decreasing mechanical strength of the battery. | 04-16-2009 |
20090098459 | ELECTROCHEMICAL ELEMENT, AND METHOD AND APPARATUS FOR MANUFACTURING ELECTRODE THEREOF - A method for manufacturing an electrode of an electrochemical element includes: (A) forming an active material layer on a current collector; and (B) providing lithium to the active material layer. The A step and the B step are carried out in continuous space. | 04-16-2009 |
20090104515 | LITHIUM SECONDARY BATTERY - A lithium secondary battery of this invention includes: a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material; a separator; and a non-aqueous electrolyte. The negative electrode active material includes a first portion capable of absorbing and desorbing lithium ions and a second portion covering at least a part of a surface of the first portion. The second portion includes at least one material that is less reactive with oxygen than the first portion. | 04-23-2009 |
20090104529 | ELECTRODE FOR LITHIUM ION SECONDARY BATTERY - An object of the present invention is to provide an electrode for a lithium ion secondary battery that can ensure a high level of safety even when exposed to severe conditions such as a nail penetration test or crush test, and exhibit excellent output characteristics. | 04-23-2009 |
20090117463 | LITHIUM ION SECONDARY BATTERY - In a lithium ion secondary battery including a positive electrode, a negative electrode containing an alloy-based negative electrode active material, a separator, a positive electrode lead, a negative electrode lead, a gasket, and an outer case, the positive electrode is allowed to contain an oxygen deficient non-stoichiometric oxide, or an oxygen removing layer containing an oxygen deficient non-stoichiometric oxide is provided between the positive electrode and the separator. In a lithium ion secondary battery containing the alloy-based negative electrode active material, a reaction between oxygen generated in the positive electrode and the alloy-based negative electrode active material, and heat generation accompanying the reaction are prevented. | 05-07-2009 |
20090155686 | NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - A non-aqueous electrolyte secondary battery of this invention includes a positive electrode including a positive electrode mixture, a negative electrode including a negative electrode mixture, and a non-aqueous electrolyte. The negative electrode mixture includes a material capable of absorbing and desorbing Li and a carbon material. The material capable of absorbing and desorbing Li includes at least one element selected from the group consisting of Si and Sn, and the amount of the carbon material is 3 to 60% by weight of the negative electrode mixture. At least one of the positive electrode, the negative electrode, and the non-aqueous electrolyte contains a lithium perfluoroalkylsulfonyl imide represented by the following general formula (1): | 06-18-2009 |
20100112442 | ELECTRODE FOR ELECTROCHEMICAL DEVICE AND ELECTROCHEMICAL DEVICE USING THE SAME - An electrode for an electrochemical device according to the present invention includes a current collector and an active material layer formed on the current collector. The active material layer includes an active material capable of reversibly absorbing and desorbing lithium ions and having a theoretical capacity density of more than 833 mAh/cm | 05-06-2010 |
20100112451 | NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY - A negative electrode | 05-06-2010 |
20100136393 | LITHIUM ION SECONDARY BATTERY - In a lithium ion secondary battery, a lithium-nickel-containing composite oxide that contains lithium and nickel is used as a positive electrode active material, and a negative electrode active material having a melting temperature of 1200° C. or less in a lithium-absorbed state is included in a negative electrode active material layer. By configuring as above, in the lithium ion secondary battery, it is possible to achieve higher capacity, higher output, and longer life, as well as further improved safety, and particularly in a nail penetration test, to suppress the heat generation due to internal short circuit and to reliably prevent the occurrence of thermal runaway. | 06-03-2010 |
20100136428 | NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - The non-aqueous electrolyte secondary battery of the present invention is provided with an electrode plate group and a non-aqueous electrolyte, the electrode plate group including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, a positive electrode lead connected to the positive electrode, and a negative electrode lead connected to the negative electrode. The energy density of the electrode plate group is 750 Wh/L or higher by volume, and the cross-sectional area of at least one of the positive electrode lead and the negative electrode lead is 5.5×10 | 06-03-2010 |
20100247990 | BATTERY PACK - A battery pack | 09-30-2010 |
20100320080 | Electrode for Electrochemical Element and Electrochemical Element using the Electrode - An electrode for an electrochemical element reversibly absorbing and releasing lithium ions including: a current collector having a higher first convex portion and a lower second convex portion on at least one surface thereof; a columnar body including an active material formed in such a manner as to rise obliquely on the first convex portion and the second convex portion of the current collector. | 12-23-2010 |
20110003208 | NEGATIVE ELECTRODE FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - A negative electrode for a non-aqueous electrolyte secondary battery including: a current collector; and an active material layer including at least two alloy-based active materials selected from the group consisting of silicon, tin, a silicon oxide, and a tin oxide. The active material layer includes a first portion supported on a surface of the current collector, a second portion supported on a surface of the first portion, and a third portion supported on a surface of the second portion. The first portion includes the silicon oxide or the tin oxide, and the oxygen content in the silicon oxide or the tin oxide in the first portion decreases continuously or stepwise as approaching the second portion. The second portion includes silicon or tin. The third portion includes the silicon oxide or the tin oxide, and the oxygen content in the silicon oxide or the tin oxide in the third portion increases continuously or stepwise with distance from the second portion. | 01-06-2011 |
20110020536 | ELECTRODE FOR LITHIUM SECONDARY BATTERY AND METHOD OF MANUFACTURING SAME - A production method of an electrode for a lithium-ion secondary battery includes: (A) a step of providing a current collector | 01-27-2011 |
20110020688 | PORTABLE ELECTRONIC DEVICE - Provided is a highly safe portable electronic device having a secondary battery as a power source, and including a package, an electronic device body housed in the package, and a battery housing portion housed in the package, in which even if the content melts due to an extremely significant impact applied thereto, discharge of a melt is inhibited. In the portable electronic device, the battery housing portion is a molding with a battery fitting portion for fitting the secondary battery therein, and the battery fitting portion has a covering layer, which includes a temperature suppression layer and a block layer, provided on its surface. | 01-27-2011 |
20110026207 | PORTABLE ELECTRONIC DEVICE - A portable electronic device of the present invention includes a package, an electronic device body, a battery housing portion including a battery fitting portion for fitting a secondary battery therein, a foaming agent-containing layer provided on a surface of the battery housing portion, and a secondary battery to be fitted in the battery fitting portion. The foaming agent-containing layer is normally thin and, in the event of the battery generating heat, the layer turns into a thicker foamed layer which exhibits superior thermal insulation properties. Thus, it is possible to provide a portable electronic device having the degree of freedom in design for size and thickness reduction achieved at a high level, while offering high-level safety and reliability. | 02-03-2011 |
20110064983 | PORTABLE ELECTRONIC DEVICE - Provided is a highly safe portable electronic device having a secondary battery as a power source, and including a housing, an electronic device body housed in the housing, and a battery housing portion housed in the housing, in which a surface is inhibited from being locally heated to high temperature. In the portable electronic device, the battery housing portion is a molding with a battery fitting portion for fitting the secondary battery therein, and the battery fitting portion has provided on its surface a heat-insulating layer having a thickness of from 500 to 3000 μm and a thermal conductivity of 0.2 W/m·K or lower. | 03-17-2011 |
20110143195 | NEGATIVE ELECTRODE FOR LITHIUM ION BATTERY, METHOD FOR PRODUCING THE SAME, AND LITHIUM ION BATTERY - A negative electrode | 06-16-2011 |
20110159341 | BATTERY PACK - A battery pack | 06-30-2011 |
20110279088 | BATTERY PACK, DISCHARGE SYSTEM, CHARGE AND DISCHARGE SYSTEM, AND DISCHARGE CONTROL METHOD OF LITHIUM ION SECONDARY BATTERY - A battery pack includes at least a lithium ion secondary battery, a voltage sensor, and a control unit. The control unit controls discharge of the battery by a relatively high end-of-discharge voltage when the use frequency of the battery is relatively low during discharge of the battery. On the other hand, the control unit controls discharge of the battery by a relatively low end-of-discharge voltage when the use frequency of the battery is relatively high. Consequently, it is possible to prevent the utilizable capacity from decreasing more than a practical decrease in the capacity due to increase in the use frequency. | 11-17-2011 |
20120070740 | NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY AND LITHIUM ION SECONDARY BATTERY - Disclosed is a negative electrode for a lithium ion secondary battery, the negative electrode including a negative electrode current collector with protrusions formed on a surface thereon, and columnar bodies being carried on the protrusions and comprising an alloy active material capable of absorbing and releasing lithium ions. The columnar bodies each have a multilayer structure in which a plurality of unit layers comprising the alloy active material are stacked sequentially on the surface of the protrusion, and the average layer thickness of the unit layer in a region within 20% of the thickness of the columnar body extending from the surface of the protrusion is smaller than that in a region within 80% of the thickness of the columnar body extending from the top of the columnar body. | 03-22-2012 |
20120176097 | METHOD FOR CHARGING/DISCHARGING POSITIVE ELECTRODE ACTIVE MATERIAL IN A LITHIUM SECONDARY BATTERY, CHARGING/DISCHARGING SYSTEM PROVIDED WITH LITHIUM SECONDARY BATTERY AND VEHICLE, ELECTRONIC DEVICE, BATTERY MODULE, BATTERY PACK - In a charge/discharge method for a positive-electrode active material in a lithium secondary battery, the lithium secondary battery includes a positive electrode containing a positive-electrode active material capable of occluding and releasing lithium ions, a negative electrode containing a negative-electrode active material capable of occluding and releasing lithium ions, a separator located between the positive electrode and the negative electrode, and an electrolyte having a lithium ion conductivity; and the positive-electrode active material contains a nickel-type lithium-containing complex oxide. The positive electrode, which has been charged, is discharged until having a first potential VDp | 07-12-2012 |
20120208087 | LITHIUM SECONDARY BATTERY - A lithium secondary battery according to the present invention includes: a positive electrode having a positive-electrode active material capable of occluding and releasing lithium ions; a negative electrode having a negative-electrode active material capable of occluding and releasing lithium ions; a separator interposed between the positive electrode and the negative electrode; and an electrolyte having lithium-ion conductivity. The positive-electrode active material contains a nickel-type lithium-containing complex oxide. The negative-electrode active material contains a graphite-type material having a reversible capacity of 350 mAh/g or more and an irreversible capacity of 30 mAh/g or less. A ratio Qc/Qa between an irreversible capacity Qc per unit area in a portion of the positive electrode that opposes the negative electrode and an irreversible capacity Qa per unit area in a portion of the negative electrode that opposes the positive electrode is equal to or greater than 0.50 but less than 1.13. As a result, the charge-discharge cycle characteristics can be improved while ensuring a high capacity. | 08-16-2012 |
20130302688 | LITHIUM SECONDARY BATTERY AND METHOD FOR PRODUCING SAME - A lithium secondary battery according to the present invention includes a positive electrode containing a positive electrode active material capable of occluding/releasing lithium ions; a negative electrode containing a negative electrode active material capable of occluding/releasing lithium ions; a separator located between the positive electrode and the negative electrode; and an electrolyte having a lithium ion conductivity. The positive electrode active material contains a lithium nickel complex oxide substantially having an irreversible capacity; the negative electrode active material has lithium occluded thereto in advance; and in a completely discharged state of the lithium secondary battery when an environmental temperature is 25° C., an amount of lithium releasable from the negative electrode is larger than an irreversible capacity of the lithium secondary battery. | 11-14-2013 |
20130314051 | METHOD FOR CHARGING AND DISCHARGING LITHIUM SECONDARY BATTERY, AND SYSTEM FOR CHARGING AND DISCHARGING LITHIUM SECONDARY BATTERY - A charge/discharge method for a lithium secondary battery is performed on a lithium secondary battery including a positive electrode containing a positive electrode active material capable of occluding/releasing lithium ions; a negative electrode containing a negative electrode active material capable of occluding/releasing lithium ions; a separator located between the positive electrode and the negative electrode; and an electrolyte having a lithium ion conductivity. The positive electrode active material contains a lithium-containing transition metal oxide; and a reversible capacity of the negative electrode is larger than a usable capacity of the positive electrode. First charge/discharge is performed by which the positive electrode in a charged state is discharged until having a first potential VDp | 11-28-2013 |