Matsushita Electric Industrial Co., Ltd.

Yoshinori Toyoguchi

Yasuhiko Bito

Hiromu Matsuda

Shuji Ito

Masaki Hasegawa

Toshihide Murata

Kazuhiro Ohta

Yukihiro Okada

Osamu Yamamoto

Hiroyuki Murai

Munehisa Ikoma

Toshitada Sato

Takashi Iijima

Yoichiro Tsuji

Katsunori Komori

Hideharu Takezawa

Nobuyasu Morishita

Tooru Matsui

Hajime Seri

Junichi Yamaura

Tadao Kimura

Kohei Suzuki

Seiji Yamaguchi

Yasushi Nakagiri

Nobuo Eda

Shiro Nankai

Isao Matsumoto

Yoshio Moriwaki

Tsutomu Iwaki

Tadashi Sotomura

Yoichi Izumi

Kiyoshi Hayashi

Yasuharu Yamamura

Hiromi Kajiya

Masataro Fukuda

Kanji Takata

Chiaki Iwakura

Akemi Shintani

Toshihiro Yamada

Naoji Furukawa

Yoshinori Yamada

Shigeko Takahashi

Ayako Tanaka

An alkaline zinc secondary battery in accordance with the present invention comprises a separator layer comprising a gel electrolyte comprising a water absorbent polymer and an alkaline aqueous solution, disposed between a negative electrode comprising at least one selected from the group consisting of zinc and zinc oxide and a positive electrode. Because the separator layer is in a gel form, transfer of zinc ions is limited. Thereby, deformation of the negative electrode and generation of dendrite due to charge and discharge of the battery are substantially inhibited. Moreover, since impurity ions such as nitrate ions become less prone to move, self-discharge of the battery is also inhibited.

Alkaline zinc secondary cell and method for preparation thereof

In a non-aqueous electrolyte secondary battery, the reaction between the non-aqueous electrolyte and the electrode is suppressed to reduce a decrease in the discharge capacity with the charge/discharge cycle progress and the deterioration of battery characteristics during high-temperature storage. At least one of a chargeable and dischargeable positive electrode, a non-aqueous electrolyte containing a lithium salt, and a chargeable and dischargeable negative electrode in a non-aqueous electrolyte secondary battery contains at least one selected from the group consisting of a phosphate having three aliphatic hydrocarbon groups having 7 to 12 carbon atoms, a phosphate having two aliphatic hydrocarbon groups having 1 to 12 carbon atoms or an aromatic hydrocarbon group, and a phosphate having an aliphatic hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group.

Non-aqueous electrolyte secondary battery and method for manufacturing the same

The present invention provides a positive electrode, which contains at least one organic sulfide compound selected from the group consisting of a thiolato compound and a thiol compound, and at least one selected from the group consisting of sulfur and a lithium sulfide represented by Formula (1): (Li S) , where 0<x&lE;2 and n>0, a method of manufacturing the positive electrode, and a lithium battery using the positive electrode. Compared with the prior art lithium battery, the lithium battery using the positive electrode of the present invention has a greater capacity and a higher voltage. The positive electrode of the present invention effectively suppresses escape of the positive electrode active material from the positive electrode during charge and discharge operations and thus actualizes a secondary battery of high energy density having a less decrease in service capacity.

Positive electrode and lithium battery using the same

Disclosed is a nickel positive electrode for alkaline storage batteries with superb utilization of nickel hydroxide in an atmosphere from room temperature to high temperature. The positive electrode comprises a nickel hydroxide particle or a nickel hydroxide particle with one or more elements other than Ni incorporated therein, a coating layer which comprises a compound of cobalt having a mean valence over 2 and which coats the nickel hydroxide particle, and a compound of at least one element selected from the group consisting of Ca, Sr, Ba, Cu, Ag, Cd, Y, Yb, Ce, Sm, Gd and Er.

Nickel positive electrode for alkaline storage batteries

A solid solution represented by the formula (1): Li M M is used as a negative electrode active material for a non-aqueous electrolyte secondary battery comprising a chargeable and dischargeable positive electrode, a non-aqueous electrolyte and a chargeable and dischargeable negative electrode. In the formula (1), M represents at least one element selected from the group consisting of Ti, Zr, Mn, Co, Ni, Cu and Fe, and M represents at least one element selected from the group consisting of Si and Sn, and 0&lE;x<10, 0.1&lE;y&lE;10 and z&equals;1.

Non-aqueous electrolyte secondary battery

Disclosed is an active material for a hydrogen storage alloy electrode which can provide a nickel-metal hydride storage battery having a longer cycle life than any conventional battery. The active material has a core alloy of a hydrogen storage alloy and a surface layer comprising iron compound formed on the surface of the core alloy.

Active material for hydrogen storage alloy electrode and method for producing the same

Disclosed is a negative electrode active material offering a long life non-aqueous electrolyte secondary battery with high energy density that shows excellent cycle life characteristics. The negative electrode active material comprises a compound represented by the formula DSnO wherein D represents at least one selected from the group consisting of alkaline earth metals.

A hydrogen storage alloy electrode having a high capacity and excellent cycle characteristics is provided. The electrode is made from particulate active material comprising a hydrogen storage alloy of body-centered cubic crystal structure or body-centered tetragonal crystal structure, said hydrogen storage alloy being represented by the general formula Ti,M,Cr,M,L,, wherein M,is at least one element selected from the group consisting of Nb and Mo; M,is at least one element selected from the group consisting of Mn, Fe, Co, Cu, V, Zn, Zr, Ag, Hf, Ta, W, Al, Si, C, N, P and B; L is at least one element selected from the group consisting of rare-earth elements and Y; 0.2&lE;a&lE;0.7; 0.01&lE;b&lE;0.4; 0.1&lE;c&lE;0.7; 0&lE;d&lE;0.3; 0&lE;e&lE;0.03; and a&plus;b&plus;c&plus;d&plus;e&equals;1.0, and said particulate active material having a Ti&mdash;Ni system alloy phase in the surface portion thereof.

Hydrogen storage alloy electrode and method for manufacturing the same

Method for producing nickel positive electrode for alkaline storage batteries

The disclosure is a non-aqueous electrolyte secondary battery of high energy density and long life exhibiting an excellent charge and discharge cycle life. The battery comprises a rechargeable positive electrode, a rechargeable negative electrode, and a non-aqueous electrolyte, the negative electrode including a compound represented by the formula Li,MX,, where X represents at least one selected from the group consisting of fluorine, chlorine, bromine and iodine and M represents at least one selected from the group consisting of Sn, Si, Ge, Pb, Bi, P, B, Ga, In, Al, As, Sb, Zn, Ir, Mg, Ca, Sr, and Ba and where 0&lE;&kgr;<10 and 2<&agr;<12.

A non-aqueous electrolyte secondary battery is disclosed, which hardly causes deterioration of its properties at high temperatures. The battery has a chargeable and dischargeable cathode, a chargeable and dischargeable anode, and a non-aqueous electrolyte and includes a substance which produces water with an increase in temperature in any one of the cathode, the anode, the non-aqueous electrolyte, other elements, and voids in the battery. Examples of the substance which produces water include hydroxides and compounds having water of crystallization.

The present invention provides a method for detecting a fully charged condition of a secondary battery by which the fully charged condition of a secondary battery can be detected accurately and deterioration in battery characteristic due to overcharging can be restrained irrespective of the charging mode and the surroundings, without the need for a special battery structure. In the method, pulse vibrations generated inside a secondary battery being charged are detected, and when the obtained characteristic value of the pulse vibrations, for example, incidence of generation of the vibrations reaches a predetermined value, the secondary battery is determined to be in fully charged condition.

Method for detecting fully charged condition of secondary battery and

The present invention provides a non-aqueous electrolyte secondary battery having an anode active material with a high capacity and excellent cycle characteristics. The active material comprises a salt of a metal or a semi-metal and a compound selected from the group consisting of oxo-acids, thiocyanic acid, cyanogen, and cyanic acid, wherein each said oxo-acid comprises an element selected from the group consisting of nitrogen, sulfur, carbon, boron, phosphorus, selenium, tellurium, tungsten, molybdenum, titanium, chromium, zirconium, niobium, tantalum, manganese, and vanadium, salts of said oxo-acids of phosphorus and boron being restricted to hydrogenphosphates and hydrogenborates.

A positive electrode active material and a positive electrode for an alkaline storage battery are disclosed which exhibit high charge efficiency at a high temperature. The positive electrode active material comprises particles formed by agglomeration of crystals of nickel hydroxide active material, at least the surface layer of the particles containing a solid solution nickel hydroxide with manganese incorporated therein. The solid solution is present as crystals growing on the crystal surface of said nickel hydroxide active material and/or crystals independent of crystals of the nickel hydroxide active material. The content of manganese in the solid solution is at least one mole percent on the whole metal ions in the solid solution and not higher than 10 mole percent on the combined total amount of the metal ions in the nickel hydroxide active material and the solid solution. The positive electrode for an alkaline storage battery contains the above-mentioned active material and a compound of at least one element selected from the group consisting of Ca, Sr, Ba, Cu, Ag, Cd, Y and Yb.

Nickel hydroxide positive electrode active material having a surface

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Yao, Japan

Yoshinori Toyoguchi