A high capacity lithium secondary battery with excellent safety is provided by suppressing expansion of a negative electrode active material during charge and increasing the content of a heat-resistant resin in a separator relative to conventional one. The lithium secondary battery includes: a negative electrode active material that comprises compound particles containing at least one metal element selected from the group consisting of Si, Sn, Al, and Zn; and a separator that has a first porous layer comprising polyolefin and a second porous layer comprising a heat-resistant resin. The separator contains 10 to 60 parts by weight of the second porous layer per 100 parts by weight of the first porous layer.

Lithium Secondary Battery

A nonaqueous electrolyte battery whose electrolyte can be selected from a wider range of materials can be obtained. The nonaqueous electrolyte battery comprises a positive electrode, a negative electrode and a nonaqueous electrolytic solution. At least one of the positive and negative electrodes has a collector which includes a compound containing at least one element selected from the group consisting of transition metal elements, group III elements, group IV Elements, and group V elements.

Nonaqueous electrolyte battery

PROBLEM TO BE SOLVED: To provide a battery capable of enhancing high temperature characteristics. SOLUTION: A separator is impregnated with an electrolyte. The electrolyte contains a solvent and an electrolyte salt. The solvent contains halogenated ethyl carbonate such as 4-fluoro-1,3-dioxolane and a phosphorus-containing compound such as trimethyl phosphate. Thereby, chemical stability at high temperature can be increased. By furthermore containing vineylene carbonate as the solvent, higher effect can be obtained. COPYRIGHT: (C)2007,JPO&INPIT

Electrolyte and battery

A subject for the invention is to improve the cycle characteristics of a high-capacity secondary battery containing an active material packed at a high density, by using a particulate active material having a low aspect ratio. The invention relates to a nonaqueous-electrolyte secondary battery comprising a negative electrode and a positive electrode each capable of occluding/releasing lithium, a separator, and a nonaqueous electrolyte solution comprising a nonaqueous solvent and a lithium salt, characterized in that the separator comprises a porous film made of a thermoplastic resin containing an inorganic filler, and at least either of the following is satisfied: the active material contained in the negative electrode is a particulate active material having an aspect ratio of from 1.02 to 3; and the active material contained in the positive electrode is a particulate active material having an aspect ratio of from 1.02 to 2.2.

Nonaqueous electrolyte secondary battery

Negative active materials for rechargeable lithium batteries, methods of manufacturing the negative active materials, and rechargeable lithium batteries including the negative active materials are provided. One negative active material includes an active metal core and a crack inhibiting layer formed on the core. The crack inhibiting layer includes a carbon-based material.

Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery comprising the same

PROBLEM TO BE SOLVED: To improve high-rate discharge characteristics of a battery using an electrode material for a lithium secondary battery made up by arranging a conductive auxiliary such as carbon on surfaces of active material particles such as lithium manganese phosphate. SOLUTION: By introducing a carbon raw material such as methanol into a heating furnace while stirring the active material particles or powder of precursor thereof by using a rotary baking furnace (rotary kiln) or the like as the above heating furnace, carbon is distributed on the active material particles. A process of producing a lithium manganese phosphate compound from a precursor of the lithium manganese phosphate compound and a process of distributing a conductive auxiliary material on particle surfaces of an electrochemical active material are carried out at the same time. COPYRIGHT: (C)2010,JPO&INPIT

Device and method of manufacturing electrode material as well as method of manufacturing lithium secondary battery

PROBLEM TO BE SOLVED: To suppress gas occurrence of a nonaqueous electrolyte battery, especially gas occurrence in high temperature storage to suppress the swelling of the nonaqueous electrolyte battery. SOLUTION: The nonaqueous electrolyte battery is equipped with a nonaqueous electrolyte, a positive electrode, and a negative electrode having a negative active material inserting or releasing lithium ions at a potential of 1.2 V or higher vs. Li. The nonaqueous electrolyte contains vinylene carbonate, the negative electrode has a coating thereon, and the battery is used in a region of a negative electrode potential nobler than 0.8 V vs. Li. The manufacturing method of the nonaqueous electrolyte battery is such that the nonaqueous electrolyte containing vinylene carbonate is used, the initial charge discharge is conducted in a condition that the negative electrode potential in a charging completion stage exceeds 0.8 V vs. Li to form the coating on the surface of the negative electrode, or in the initial charge discharge, the negative electrode potential is lowered at least once to 0.4 V or lower vs. Li to form the coating on the surface of the negative electrode. COPYRIGHT: (C)2008,JPO&INPIT

Nonaqueous electrolyte battery and its manufacturing method

Positive electrode active material for nonaqueous electrolyte secondary battery, its manufacturing method, and nonaqueous secondary battery equipped therewith

An object of the present invention is to provide a lithium secondary battery mixing active material with improved and both battery capacity and cycle characteristics, an electrode and a lithium secondary battery using the mixed active material. The present invention has an alpha-NaFeO

Active material for lithium secondary batteries, a lithium secondary battery electrode and a lithium secondary battery

PROBLEM TO BE SOLVED: To provide an epoxy resin composition for laminated boards, which is in particular excellent in dielectric properties becoming important when the epoxy resin composition is used for laminated board applications, has a low water absorption rate, and is also excellent in heat resistance (high Tg).SOLUTION: An epoxy resin composition for laminated boards includes following component (A) and component (B). A laminated board includes the epoxy resin composition for laminated boards and an electroconductive metal. Component (A): an epoxy resin obtained by reacting a bisphenol compound represented by formula (1) and epihalohydrin, wherein the epoxy resin is obtained by reacting 1.00-4.80 mol of epihalohydrin with 1 mol of hydroxyl group of the bisphenol compound represented by the formula (1). Component (B): a phenol-based epoxy resin curing agent and/or a dicyandiamide-based epoxy resin curing agent.

Epoxy resin composition for laminated board, laminated board, and integrated circuit

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田渕徹

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Device and method of manufacturing electrode material as well as method of manufacturing lithium secondary battery

Nonaqueous electrolyte battery and its manufacturing method

Positive electrode active material for nonaqueous electrolyte secondary battery, its manufacturing method, and nonaqueous secondary battery equipped therewith

Active material for lithium secondary batteries, a lithium secondary battery electrode and a lithium secondary battery

Epoxy resin composition for laminated board, laminated board, and integrated circuit

田渕 徹

Author Tools

Chat about Author

Papers

Device and method of manufacturing electrode material as well as method of manufacturing lithium secondary battery

Nonaqueous electrolyte battery and its manufacturing method

Positive electrode active material for nonaqueous electrolyte secondary battery, its manufacturing method, and nonaqueous secondary battery equipped therewith

Active material for lithium secondary batteries, a lithium secondary battery electrode and a lithium secondary battery

Epoxy resin composition for laminated board, laminated board, and integrated circuit

田渕徹