Sanyo Electric Co., Ltd.

Other

Satoshi Narukawa

Hironosuke Ikeda

Yasuhiro Yamauchi

Hiroshi Watanabe

Ikuro Nakane

Naoki Imachi

Shiori Nakamizo

Toru Amazutsumi

Hiyoshi Tamaki

Tooru Amazutsumi

Mitsunori Hara

Tsutomu Sonozaki

Shigehiro Nakaido

Hideki Fukuda

Takanori Fujii

Yasunobu Kodama

Tsukasa Itou

Toyoji Machida

Kazuro Moriwaki

Kazuo Teraji

Masataka Takeuchi

Hiroyuki Ohno

Takashi Ohkubo

Shuichi Naijo

Takaaki Ikemachi

Shigeto Tamezane

Keiji Saisho

Seiji Morita

Takashi Yamaguchi

Keiichi Tsujioku

Kanji Urushihara

Nobuaki Masaki

Nobuhiro Nagao

Yoshihiro Tobita

Akiyoshi Sakai

Ichiro Yoshida

Syouzaburou Saji

Shiori Maeda

Hiroji Maeda

Ikurou Nakane

Hitoshi Nakashima, Deceased

Akira Kuroda

Atsushi Yamano

Norio Tsujioka

Yuichi Yokoyama

A nonaqueous electrolyte secondary battery according to the invention comprises a positive electrode containing a positive electrode active material including lithium containing composite oxide having a layer crystal structure represented by a general formula of LiMnCoMO(0.9&#x2266;X&#x2266;1.1, 0.45&#x2266;a&#x2266;0.55, 0.45&#x2266;b&#x2266;0.55, 0&#x3c;c&#x2266;0.05 and 0.9&#x3c;a+b+c&#x2266;1.1 are set and M is at least one kind selected from Al, Mg, Sn, Ti and Zr), a negative electrode containing a negative electrode active material capable of intercalating and deintercalating lithium ion, a separator for separating the positive electrode from the negative electrode, and a nonacqueous electrolyte.

Nonaqueous electrolyte secondary battery

In a non-aqueous secondary cell having a positive electrode, a negative electrode, a nonaqueous electrolyte, a separator interposed between the positive electrode and the negative electrode, the positive electrode having a positive electrode active material including a chemical compound capable of reversibly intercalating lithium and the negative electrode having a negative electrode active material including a material capable of reversibly intercalating lithium, the separator has through holes formed therein for passing lithium dendrites therethrough.

Nonaqueous electrolyte secondary cell

A lithium secondary battery comprises a negative electrode capable of intercalating/deintercalating lithium ion, a positive electrode made of a lithium-containing metal oxide as an active positive material, and a nonaqueous electrolyte, and a polyvinylidene fluoride resin is disposed between said negative electrode and positive electrode so that the battery voltage doesn't rise beyond a predetermined value even when said battery is overcharged.

Lithium secondary battery and battery device comprising same

The nonaqueous secondary battery according to the invention uses a separator which is a composite resin film with a reinforcing material layer integrally filled with polyvinylidene fluoride resin or a separator which is a composite resin film with a polyvinylidene fluoride resin layer and a reinforcing material layer stacked thereon. In this way, when the reinforcing material layer is integrally filled with the polyvinylidene fluoride (PVdF) resin , or the reinforcing material layer is stacked on the polyvinylidene fluoride (PVdF) resin layer , even if the polyvinylidene fluoride resin swells, its swelling is limited by the reinforcing material layer in the directions of width and length so that the separator or does not wrinkle.

Nonaqueous secondary battery

A nonaqueous secondary battery of the present invention comprises a polyvinylidene fluoride resin layer formed on either or both of the surface of the positive electrode and the negative electrode. This polyvinylidene fluoride resin layer exhibits excellent liquid retaining properties and thus can be formed on the surface of the electrodes to reduce the capacity drop during high temperature storage and hence improve the high temperature storage properties of the battery.

A positive electrode for a non-aqueous electrolyte cell containing spinel-type lithium manganese oxide as a main active material, wherein the positive electrode is comprised of a mixture of spinel-type lithium manganese oxide represented by a formula Li Mn O (provided that the atomic ratio of lithium and manganese is determined to be 0.56&lE;Li/Mn &lsqb;&equals;(1&plus;X)/(2&minus;Y)&rsqb;&lE;0.62, X is determined to be&minus;0.2&lE;X&lE;0.2, and Y is determined to be Y&lE;1.0) and at least either one of lithium cobalt oxide represented by a formula Li CoO (provided that Z is determined to be&minus;0.5&lE;Z&lE;0.5) or lithium nickel oxide represented by a formula Li NiO (provided that Z is determined to be&minus;0.5&lE;Z &lE;0.5), and wherein in the case that the weight of spinel-type manganese oxide is defined as A and that the weight of the lithium cobalt oxide or lithium nickel oxide is defined as B, the amount of lithium cobalt oxide or lithium nickel oxide is determined to be 0.5&lE;B/(A&plus;B)<0.2.

Positive electrode for non-aqueous electrolyte cell and manufacturing method of the same

A non-aqueous secondary battery comprising a negative electrode made of an active negative electrode material capable of intercalating/deintercalating lithium ion, a positive electrode made of spinnel type lithium manganese oxide as a main active positive electrode material and an electrolyte containing a non-aqueous solvent is characterized in that said positive electrode comprises lithium cobalt oxide in admixture with spinnel type lithium manganese oxide having crystal lattices partially substituted by magnesium or aluminum and said non-aqueous solvent comprises vinylene carbonate incorporated therein.

Non-aqueous secondary battery

The invention provides a non-aqueous electrolyte cell having a high working voltage in a low temperature range of 0&deg; C. or below and thereby attaining excellent low temperature discharge characteristics, a reduced internally-generated gas, and an excellent safety against heat. This is achieved by a cell comprising a non-aqueous electrolyte containing propylene carbonate and LiN(SO C F ) as an electrolyte salt, a graphite negative electrode, and a positive electrode having a positive electrode active material comprising a Ti-attached LiCoO in which a particle of titanium and/or titanium compound is attached on a surface of a particle of lithium cobalt oxide and a mole ratio of titanium and/or titanium compound in the Ti-attached LiCoO is within the range of from 0.00001 to 0.02.

Non-aqueous electrolyte cell having a positive electrode with Ti-attached LiCoO2

The discharge method discharges a plurality of serially connected rechargeable batteries, wherein the remaining charge in each discharging rechargeable battery is detected, and a battery with the lowest remaining charge is designated a low charge rechargeable battery. The plurality of serially connected rechargeable batteries are discharged while supplying battery voltage stepped down from the output voltage of the serially connected rechargeable batteries to the low capacity rechargeable battery.

Method of controlling discharge of a plurality of rechargeable batteries, and battery assembly

Sealed non-aqueous electrolyte cell having a casing of a sheet of laminated material

A cylindrical alkaline storage battery including a spiraled electrode body composed of a pair of opposed electrodes spirally rolled up through a separator and coupled within a cylindrical casing, at least one of the electrodes being in the form of a non-sintered type electrode composed of an active material retention substrate of three dimensionally meshed structure impregnated with paste of an active material, and a current collector formed with a disc portion for connection to one end portion of the non-sintered type electrode and a lead portion for connection to a terminal, wherein the one end portion of the non-sintered type electrode is formed without impregnation of the paste of the active material, and wherein a perforated sheet metal welded to the one end portion of the non-sintered type electrode is welded at its side edge to the disc portion of the current collector.

Cylindrical alkaline storage battery and manufacturing method of the same

A thin type battery having a electricity generating element disposed in a sealed chamber formed by a laminated sheathing. The laminated sheathing forms the sealed chamber by overlapping and airtightly adhering opposing surfaces of the laminated films at a primary sealing area and at a secondary sealing area which is perpendicular to the direction of the primary sealing area. Collector terminals are connected to a positive electrode and to a negative electrode of the electricity generating element. The collector terminal are airtightly crimped in the secondary sealing area of the laminated sheathing. Also, the collector terminals extend outwardly of the laminated sheathing. The primary sealing part of the laminated sheathing is located over a surface of the electricity generating element.

Thin type battery with laminated sheathing

In a thin type sealed cell utilizing a cell case made of a laminated material, a storage life and reliability of the cell is increased by preventing a sectional surface at an end of the laminated material from being exposed in the cell case, and thereby a leakage of an electrolyte out of the cell and a short circuit in the cell are avoided. This is achieved by disposing a resin layer on the inner surface of the cell case composed of a sheet type laminated material, and covering the sectional surface existing inside the cell case with resin.

Thin type sealed cell and producing method thereof

The charge-discharge control circuit prevents over-charge and over-discharge of a plurality of series connected batteries. It is provided with a detection circuit to determine the state of charge and discharge of the batteries, at least one bypass circuit connected in parallel with one of the batteries, and a connection circuit which, in response to results from the detection circuit, selectively connects the bypass circuit to a battery determined to be in an approximately fully charged state or approximately fully discharged state.

Charge-discharge control circuit, over-charge prevention circuit, and

A battery is provided which includes: an electrode roll having a positive-electrode plate, a negative-electrode plate and a separator interposed therebetween; a battery casing accommodating the electrode roll; and a sealing plate laser-welded to an open end of the battery casing. On the outermost periphery of the electrode roll is located an electrode-base-exposed portion of either one of the positive-electrode plate and the negative-electrode plate. The sealing plate is laser-welded to the battery casing in a state that a collector tab formed by incising the electrode-base-exposed portion and folding the incised portion is held between the periphery of the open end of the battery casing and the sealing plate. With this construction, the electrical connection between the collector tab and the battery casing is assuredly achieved simultaneously with the sealing of the battery to suppress a reduction in the closed-circuit voltage and an increase in the internal resistance. In addition, the battery of this construction can be fabricated by a simplified battery fabrication process.

Laser-sealed battery

Growing community of inventors

Sumoto, Japan

Satoshi Narukawa