Patent application number | Description | Published |
20090214938 | Non-aqueous electrolyte secondary battery - A non-aqueous electrolyte secondary battery has a positive electrode ( | 08-27-2009 |
20090246632 | Lithium secondary battery and method of manufacturing the same - A lithium secondary battery contains a negative electrode binder containing a polyimide resin having a structure represented by the following chemical formula (1), and the polyimide resin having a molecular weight distribution such that the weight ratio of a polyimide resin having a molecular weight of less than 100,000 and a polyimide resin having a molecular weight from 100,000 to less than 200,000 is from 50:50 to 90:10: | 10-01-2009 |
20120129048 | BINDER FOR LITHIUM SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY, LITHIUM SECONDARY BATTERY, BINDER PRECURSOR SOLUTION FOR LITHIUM SECONDARY BATTERY, AND METHOD FOR MANUFACTURING NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY - Provided is a binder capable of realizing a lithium secondary battery that includes a negative electrode including a negative-electrode active material layer containing at least one of silicon and a silicon alloy as a negative-electrode active material and also containing a binder and has an excellent charge-discharge cycle characteristic. The binder for the lithium secondary battery contains a polyimide resin that is formed by imidizing either a tetracarboxylic acid or a tetracarboxylic anhydride and a diamine, the polyimide resin having a hydrolyzable silyl group. | 05-24-2012 |
20130101897 | LITHIUM SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME - Provided is a lithium secondary battery in which negative-electrode active material particles containing silicon and/or a silicon alloy are used and which prevents the occurrence of breakage of a binder itself and peel-off of the binder at the interfaces with the negative-electrode active material and the negative-electrode current collector and has a high energy density and an excellent cycle characteristic. The lithium secondary battery includes: a negative electrode in which a negative-electrode active material layer including negative-electrode active material particles containing silicon and/or a silicon alloy and a binder is formed on a surface of electrically conductive metal foil serving as a negative-electrode current collector; a positive electrode; and a nonaqueous electrolyte, wherein the binder contains a polyimide resin including a crosslinked structure formed by imidization of a hexavalent or higher-valent carboxylic acid or an anhydride thereof with a diamine. | 04-25-2013 |
Patent application number | Description | Published |
20100081063 | NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - A non-aqueous electrolyte secondary battery has a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte dissolving a solute in a non-aqueous solvent wherein the negative electrode contains a negative electrode active material containing powdered silicon and/or silicon alloy and a binding agent, and the non-aqueous electrolyte contains a fluorinated cyclic carbonate represented by a general formula (1) below, and wherein when Li storage volume per unit area in the negative electrode during charging is determined as A and the theoretical maximum Li storage volume per unit area in the negative electrode is determined as B, a utilizing rate (%) of negative electrode as expressed by (A/B)×100 is 45% or less. | 04-01-2010 |
20110076534 | LITHIUM ION SECONDARY BATTERY - A lithium ion secondary battery | 03-31-2011 |
20110217577 | LITHIUM SECONDARY BATTERY - A lithium secondary battery comprises an electrode assembly and a non-aqueous electrolyte. The electrode assembly is made by winding a negative electrode, a positive electrode, and a separator interposed between the negative and positive electrodes. The negative electrode contains a negative electrode active material that is alloyed with lithium. The non-aqueous electrolyte is impregnated in the electrode assembly. At least one of the negative and positive electrodes is divided into a plurality of electrode units which are arranged at spaces for each other along the winding direction. | 09-08-2011 |
20110274986 | NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND NONAQUEOUS ELECTROLYTIC SOLUTION FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY - A nonaqueous electrolyte secondary battery includes a positive electrode having a positive-electrode active material, a negative electrode having a negative-electrode active material, and a nonaqueous electrolytic solution having a nonaqueous solvent dissolving a solute. The negative-electrode active material includes powdered silicon and/or a silicon alloy, the nonaqueous electrolytic solution includes additives composed of at least one fluorinated lithium phosphate selected from the group consisting of lithium monofluorophosphate, lithium difluorophosphate, and lithium trifluorophosphate and a diisocyanate compound, and the nonaqueous solvent includes a chain carbonate compound. | 11-10-2011 |
20130022879 | NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NON-AQUEOUS ELECTROLYTE SOLUTION FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - Provided is a nonaqueous electrolyte secondary battery which, even in the case of using a low-viscosity solvent having a narrow potential window, can increase the electrochemical stability of the nonaqueous electrolyte solution and suppress side reactions of the nonaqueous electrolyte solution during charge and discharge to reduce the degradation of the battery characteristics and has an excellent storage characteristic in high-temperature environments and a nonaqueous electrolyte solution for the nonaqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery includes: a positive electrode containing a positive-electrode active material; a negative electrode containing a negative-electrode active material; and a nonaqueous electrolyte solution containing a solute dissolved in a nonaqueous solvent, wherein the nonaqueous electrolyte solution further contains benzotrifluoride and a diisocyanate compound and the content of benzotrifluoride is 5% by volume or more in the nonaqueous electrolyte solution except the solute. | 01-24-2013 |
Patent application number | Description | Published |
20110151338 | NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - The present invention is made to improve charge-discharge cycle performances under high temperature environment in a non-aqueous electrolyte secondary battery using a negative electrode containing a negative electrode active material of particulate silicon and/or silicon alloy and a binding agent. | 06-23-2011 |
20140004415 | LITHIUM SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME | 01-02-2014 |
20140377649 | METHOD FOR PRODUCING NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERIES, NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERIES, AND LITHIUM SECONDARY BATTERY - Provided is a method for producing a negative electrode for lithium secondary batteries, the negative electrode being capable of imparting high cycle characteristics to a lithium secondary battery. A method for producing a negative electrode | 12-25-2014 |
20150044535 | LITHIUM SECONDARY BATTERY - A lithium secondary battery which is unlikely to be deformed during charging and discharging. A lithium secondary battery includes a spiral-shaped electrode assembly and a cylindrical battery container. The battery container receives the electrode assembly. The electrode assembly includes a negative electrode, a positive electrode, and a separator. The negative electrode includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is disposed on the negative electrode collector. The negative electrode active material layer contains a negative electrode active material forming an alloy with lithium. The positive electrode faces the negative electrode. The separator is disposed between the negative electrode and the positive electrode. When A is a proof stress of the negative electrode collector multiplied by the thickness thereof and a capacity to be charged per unit area of the negative electrode is represented by B, A≧0.075×B−3 is satisfied. | 02-12-2015 |
Patent application number | Description | Published |
20100330424 | NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERIES AND LITHIUM SECONDARY BATTERY - A negative electrode ( | 12-30-2010 |
20110117431 | LITHIUM SECONDARY BATTERY AND METHOD OF MANUFACTURING THE SAME - A lithium secondary battery including an electrode assembly and a non-aqueous electrolyte impregnated in the electrode assembly, the electrode assembly containing a positive electrode, a negative electrode having a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, the negative electrode mixture layer containing a binder and negative electrode active material particles, the negative electrode active material particles containing at least one of silicon and a silicon alloy, and a separator interposed between the negative electrode and the positive electrode. The binder contains a polyimide resin having a branch structure formed by imidizing a polyvalent amine having a valency of 3 or more and a tetracarboxylic dianhydride. | 05-19-2011 |
20110200887 | NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - A non-aqueous electrolyte secondary battery includes a positive electrode ( | 08-18-2011 |
20110311871 | NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERIES AND LITHIUM SECONDARY BATTERY - A negative electrode for lithium secondary batteries includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is formed on the negative electrode current collector. The negative electrode active material layer contains a binder and negative electrode active material particles containing at least one of silicon and a silicon alloy. The binder is a polyimide resin formed by imidization of a tetracarboxylic acid or tetracarboxylic anhydride and a diamine. The diamine contains a diamine having at least one hydroxyl group. | 12-22-2011 |
20120082892 | LITHIUM SECONDARY BATTERY - A lithium secondary battery has a positive electrode, a separator, and a negative electrode having a negative electrode current collector and a negative electrode mixture layer formed on a surface of the negative electrode current collector. The negative electrode mixture layer contains a negative electrode active material including a metal element capable of alloying with lithium. The negative electrode current collector includes a substrate made of a Cu—Fe—P alloy foil, and a surface layer provided on both surfaces of the substrate and made of pure copper. The surface layer has a Vickers hardness of 120 and less than that of the substrate. The negative electrode current collector has a proof stress of 308 MPa. | 04-05-2012 |
20130266834 | LITHIUM SECONDARY BATTERY AND METHOD FOR PRODUCING THE SAME - A lithium secondary battery and a method for producing the lithium secondary battery. The lithium secondary battery includes a negative electrode | 10-10-2013 |