Sanyo Electric Co., Ltd.

Prime Planet Energy & Solutions, Inc.

Shigeki Matsuta

Yoshio Kato

Hiromasa Yagi

Shin Fujitani

Masahisa Fujimoto

Hiroshi Nakajima

Ryuji Ohshita

Hiroshi Kurokawa

Hisaki Tarui

Yoichi Domoto

Masaki Shima

Hiroaki Ikeda

Kenji Asaoka

Maruo Kamino

Toyoki Fujihara

Shingo Tode

Katsutoshi Takeda

Masanori Maekawa

Masahiro Iyori

Yasuyuki Kusumoto

Hiroki Hamada

Hiroyuki Fujimoto

Noriyuki Tamura

Toshikazu Yoshida

Hiroyuki Kuriyama

Takashi Okamoto

Toshiyuki Nohma

Yasuhiro Yamauchi

Hideki Sano

Hiroshi Minami

Daizo Jito

Seiji Omura

Katsunobu Sayama

Masahide Miyake

Tetsuyuki Murata

Yoshiaki Noguchi

Hidekazu Yamamoto

Ryosuke Iwata

Kazunori Donoue

Nobuhiro Sakitani

Keiji Saisho

Denis Yau Wai Yu

Takeshi Yoshida

Hirofusa Tanaka

Hikaru Yoshida

Daisuke Nishide

Tetsuji Omura

Hiroko Sanda

Tetsuo Kadohata

Naoki Terada

Katsuhiro Shibata

Provided is a technology capable of improving the impregnation efficiency of an electrolyte into an electrode body. In accordance with a preferable one embodiment of a method for manufacturing a secondary battery herein disclosed, a method for manufacturing a secondary battery including an electrode body, an electrolyte, and a battery case is provided. The manufacturing method includes a solution introducing step of introducing the electrolyte into the battery case, and a pressure reducing step of reducing the pressure in the battery case after the solution introducing step. After an elapse of 10 hours or more after the solution introducing step, the pressure reducing step is carried out.

Method for manufacturing secondary battery

A slurry is prepared by mixing active material particles, capsule-shaped particles, a binder, and an organic solvent. The slurry is applied to a surface of a substrate to form a coating film. The coating film is heated to dry to form an active material layer. The active material layer is compressed to produce an electrode. Each of the capsule-shaped particles includes a thermoplastic resin. The thermoplastic resin softens when heated in the presence of the organic solvent. When the thermoplastic resin softens, the capsule-shaped particles shrink to form voids in the active material layer.

Method of producing electrode, method of producing battery, electrode, and battery

A nonaqueous secondary battery includes a current cutoff mechanism that cuts off a current in a short period of time in response to a rise in pressure inside a battery outer body in at least one of a conductive path through which a current is taken out from a positive electrode plate to outside of the battery and a conductive path through which a current is taken out from a negative electrode plate to outside of the battery. At least one type selected from an oligomer containing a cyclohexyl group and a phenyl group, a modified product of the oligomer containing a cyclohexyl group and a phenyl group, a polymer containing a cyclohexyl group and a phenyl group, and a modified product of the polymer containing a cyclohexyl group and a phenyl group is present on the surface of the positive electrode plate.

Nonaqueous electrolyte secondary battery and method for manufacturing the same

A rechargeable lithium battery including a negative electrode made by depositing a noncrystalline thin film composed entirely or mainly of silicon on a current collector, a positive electrode and a nonaqueous electrolyte, characterized in that said nonaqueous electrolyte contains carbon dioxide dissolved therein.

Lithium secondary battery and method for producing same

A method for producing a non-aqueous electrolyte secondary cell by preparing a positive electrode by applying a positive electrode mixture onto a positive electrode core material, the mixture containing a positive electrode active material mainly made of a lithium nickel composite oxide and a binding agent containing polyvinylidene fluoride; measuring the amount of carbon dioxide gas generated when a layer of the positive electrode mixture is removed out of the positive electrode and the layer is heated to 200&#xb0; C. or higher and 400&#xb0; C. or lower in an inactive gas atmosphere; selecting a positive electrode satisfying the following formulas:(0.27&#x2212;51)/1000000(200&#x2266;&#x3c;400)&#x2003;&#x2003;formula 157/1000000(400&#x2266;&#x2266;1500)&#x2003;&#x2003;formula 2where x is a heating temperature (&#xb0; C.) and y is the amount of carbon dioxide gas (mole/g) per 1 g of the lithium nickel composite oxide measured; and preparing the non-aqueous electrolyte secondary cell by using the positive electrode selected.

Method for producing positive electrode for non-aqueous electrolyte secondary cell and method for producing non-aqueous electrolyte secondary cell

A method for producing a non-aqueous electrolyte secondary cell by preparing a positive electrode by applying a positive electrode mixture onto a positive electrode core material, the mixture containing a positive electrode active material mainly made of a lithium nickel composite oxide and a binding agent containing polyvinylidene fluoride; measuring the amount of carbon dioxide gas generated when a layer of the positive electrode mixture is removed out of the positive electrode and the layer is heated to 200&#xb0; C. or higher and 400&#xb0; C. or lower in an inactive gas atmosphere; selecting a positive electrode satisfying the following formulas:&#x3c;(1.31&#x2212;258)/1000000(200&#x2266;&#x3c;300)&#x2003;&#x2003;formula 3&#x3c;1.20&#x2212;225/1000000(300&#x2266;&#x2266;400)&#x2003;&#x2003;formula 4where x is a heating temperature (&#xb0; C.) and y is the amount of carbon dioxide gas (mole/g) per 1 g of the lithium nickel composite oxide measured; and preparing the non-aqueous electrolyte secondary cell by using the positive electrode selected.

A positive electrode active material quality judgment method that can easily and accurately judge the quality of a positive electrode active material used in a non-aqueous electrolyte secondary cell without having to complete the positive electrode. The positive electrode active material quality judgment method includes: heating a positive electrode active material mainly made of a lithium nickel composite oxide to a temperature x (&#xb0; C.) of 200&#xb0; C. or higher and 400&#xb0; C. or lower; measuring the amount of carbon dioxide gas generated from the heating; and the positive electrode active material as a suitable positive electrode active material when the positive electrode active material satisfies formulas 3 and 4:&#x3c;(1.31&#x2212;258)/1000000(200&#x2266;&#x3c;300)&#x2003;&#x2003;formula 3&#x3c;1.20&#x2212;225/1000000(300&#x2266;&#x2266;400)&#x2003;&#x2003;formula 4where x is the heating temperature x (&#xb0; C.) and y is the amount of carbon dioxide gas (mole/g) generated per 1 g of the positive electrode active material in the heating to the heating temperature x (&#xb0; C.).

Method for judging quality of lithium nickel composite oxide and positive electrode using lithium nickel composite oxide

A method of producing an active material for a lithium secondary battery, by which impurities causing problems in synthesizing an active material for a lithium secondary battery, including a lithium transition metal oxyanion compound are removed efficiently and enhancement of an energy density is realized, is provided. By cleaning the active material for a lithium secondary battery, including a lithium transition metal oxyanion compound, with a pH buffer solution, for example, it is possible to efficiently remove just only impurities such as LiPOor LiCO, or a substance, other than LiFePO, in which the valence of Fe is bivalent such as FeSO, FeO or Fe(PO)without dissolving Fe of LiFePO.

Method of producing active material for lithium secondary battery, method of producing electrode for lithium secondary battery, method of producing lithium secondary battery, and method of monitoring quality of active material for lithium secondary battery

Disclosed is a nonaqueous electrolyte secondary battery which has a negative electrode containing silicon as a negative active material, a positive electrode containing a positive active material, a nonaqueous electrolyte and a separator. Characteristically, an additive which retards oxidation of silicon during operation of the battery is contained either in an interior or surface portion of the positive electrode, or in an interior or surface portion of the negative electrode, or in an interior or surface portion of the separator.

Nonaqueous electrolyte secondary battery including a negative electrode containing silicon and an additive which retards oxidation of silicon during battery operation

An electrode for a lithium battery having a thin film composed of active material capable of lithium storage and release, e.g., a microcrystalline or amorphous silicon thin film, provided on a current collector, the electrode being characterized in that a constituent of the current collector is diffused into the thin film.

Electrode for lithium batteries and rechargeable lithium battery

An electrode for a lithium secondary battery includes a thin film of an active material having a first phase that reacts with Li dominantly and a second phase that reacts less readily with Li than the first phase and exists at least before initial-cycle charging and after discharging in each cycle following the initial cycle. A surface of the current collector has an arithmetical mean roughness Ra of 0.1 &#x3bc;m or greater. A surface of the thin film has irregularities formed corresponding to the irregularities of the current collector surface. By the charging and discharging in the initial cycle and thereafter, gaps form along the thin-film thickness on lines connecting valleys in the thin-film surface irregularities and valleys in the current-collector surface irregularities, and the thin film is divided into columnar or insular structures by the gaps.

Electrode for a lithium secondary battery having a thin film active material with columnar or insular structures and lithium secondary battery

An electrode for lithium batteries, in which a thin film of active material capable of storage and release of lithium, such as a microcrystalline or amorphous silicon thin film, is provided, through an interlayer, on a current collector, the electrode being characterized in that the interlayer comprises a material alloyable with the thin film of active material.

An electrode for a rechargeable lithium battery characterized in that thin films of active material capable of lithium storage and release, i.e., microcrystalline or amorphous silicone thin films are deposited on opposite faces of a plate-form current collector.

Electrode for rechargeable lithium battery and rechargeable lithium battery

An electrode for a lithium battery having a thin film composed of active material capable of lithium storage and release, e.g., a microcrystalline or amorphous silicon thin film, provided on a current collector, the electrode being characterized in that the current collector has a surface roughness Ra of 0.01 &#x3bc;m or greater.

Electrode for use in lithium battery and rechargeable lithium battery

In an electrode for a lithium battery having a lithium storing and releasing active thin film provided on a current collector, such as a microcrystalline or amorphous silicon thin film, the electrode is characterized in that the thin film is divided into columns by gaps formed therein in a manner to extend in its thickness direction and that the columnar portions are at their bottoms adhered to the current collector.

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Kobe, Japan

Shigeki Matsuta