Japan Storage Battery Co., Ltd.

Gs Yuasa Corporation

Hideo Yasuda

Khalil Amine

Yuko Fujita

Mikio Okada

Shuji Hitomi

Naohiro Tsumura

Atsushi Funabiki

Koji Yoshimura

Shunsuke Mizutani

Masanori Yamachi

Takeshi Hasumi

Kozi Yoshimura

Teruo Sonoda

A fuel cell includes plural gas flow channels, a switching device, and a variable gas flow channel with the function of switching the connection between one gas flow channel and another gas flow channel from series to parallel or from parallel to series.

Fuel cell

The positive active material for a secondary battery of the present invention is &#x3b2;-FeOOH containing at least one element selected from the group consisting of B, P, S, Li, Na, K, Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Zr, Pb and Sn which shows a diffraction peak from the () plane having a half width Y satisfying 0.3&#xb0;&#x3c;Y (2&#x3b8;) when subjected to the X-ray diffractometry with the CuK&#x3b1; ray. A non-aqueous electrolyte secondary battery comprising as a positive active material such low-crystalline &#x3b2;-FeOOH exhibits an excellent cycle life performance as compared with a non-aqueous electrolyte secondary battery comprising a high-crystalline &#x3b2;-FeOOH as a positive active material.

Positive electrode active material for secondary cell, method for producing the same and nonaqueous electrolyte secondary cell comprising the same

An electrode for a fuel cell of the invention comprises a cation-exchange resin, carbon particles and a catalyst metal which is amorphous. The electrode has high activity, a high catalyst utilization and high CO tolerance and is highly active in the electrochemical oxidation reaction of methanol. Furthermore these qualities of the electrode were extremely improved when the catalyst metal was loaded mainly on sites where the surface of the carbon particles contacts proton-conductive passages in the cation-exchange resin. Consequently, a fuel cell with the electrode of the invention has a high output current and a long life, and can be produced at low cost.

Electrodes for fuel cell and processes for producing the same

The non-aqueous electrolyte secondary battery of the present invention comprises, e.g., a positive electrode , a negative electrode , a polymer membrane containing carbon powder or the like, and a separating membrane layer for preventing shortcircuiting. A carbon powder, silicon powder, tin powder or aluminum powder contained in the polymer membrane containing carbon powder or the like absorbs as a lithium-absorbing material metallic lithium powders or metallic lithium dendrite which has been produced from the negative electrode due to charge or discharge and takes no part in charge or discharge. This lithium-absorbing material is less reactive than the metallic lithium powders or metallic lithium dendrite and thus enhances the safety of the battery and controls shortcircuiting between the positive electrode and the negative electrode due to metallic lithium dendrite, making it possible to drastically improve charge and discharge cycle life performance.

Nonaqueous electrolyte secondary cell

In a process for producing an electrode of a nonaqueous electrolyte battery, an electrode and a polymer paste are prepared. The electrode is made of a metal as a current collector and an active material layer thereon. The polymer paste has a polymer dissolved in a solvent soluble in water. The polymer paste is allowed to be held in the electrode. Thereafter, the solvent is extracted from the polymer paste with an aqueous solution containing an alcohol, phosphorous or phosphorous compound.

Process for producing electrode of nonaqueous electrolyte battery

The following aspects (1) to (4) of the present invention can provide an electrode for a nonaqueous electrolyte battery having excellent safety and charged storage properties and good high rate charge-discharge properties. (1) An electrode for nonaqueous electrolyte battery comprising a particulate active material having a porous film formed thereon. (2) An electrode for nonaqueous electrolyte battery comprising an active material having a filler held in pores. (3) An electrode for nonaqueous electrolyte battery comprising an active material which undergoes volumetric expansion and shrinkage during charge-discharge, having a filler held in pores. (4) The electrode for a nonaqueous electrolyte battery according to embodiment (1), wherein said porous film is an ionically-conductive film.

Electrode for nonaqueous electrolyte battery

A positive electrode active material for high voltage lithium battery which is represented by general formula Li Mn M O Li Mn M O (M: a 2-valency metal (Ni, Co, Fe, Mg, Zn), with 0.45&lE;y&lE;0.60, 0&lE;x&lE;1) having cubic spinel structure of lattice constant within 8.190 angstrom. Such an active material is manufactured by employing sol-gel process wherein one of inorganic salt, hydroxide and organic acid salt of lithium or a mixture of these for Li, one of inorganic salt and organic acid salt of manganese or a mixture of these for Mn, and one of inorganic salt and organic acid salt of the selected metal or a mixture of these for M are used as the starting materials for synthesis, ammonia water is added to the solutions of these starting materials in alcohol or water to obtain gelatinous material and the gelatinous material thus obtained is fired.

Positive electrode for lithium battery

A positive electrode for a lithium battery wherein nickel oxyhydroxide is held in an electro-conductive three-dimensional porous material or a sintered nickel substrate and a lithium battery using it. When the three-dimensional porous material is used, the electric contact of the active material and the current collector is good, also the contact state of nickel oxyhydroxide particles, which are active materials, each other is good, further, the contact resistance among the particles is low, and also the diffusion of the lithium ion, which is the rate-determining step of the reaction, becomes easy among the particles. Furthermore, in a positive electrode for a lithium battery wherein lithium is intercalated into nickel oxyhydroxide by discharging and lithium is disintercalated from nickel oxyhydroxide by charging, the positive electrode contains at least one kind selected from the group of cobalt oxyhydroxide, metallic cobalt, cobalt oxide, tricobalt tetroxide, lithium cobaltate, and proton-containing cobalt dioxide.

Positive electrode for lithium battery and lithium battery

A positive active material contains lithium nickel-cobaltate, and its crystal structure is amorphous. The positive active material can further contain phosphorus. The cobalt in the positive active material can be present in a content in the range of 2 to 60 mol % (Co/(Ni+Co)). A lithium battery can contain the positive active material.

Lithium nickelate positive active material, producing method thereof and

A nonaqueous polymer cell according to the present invention contains a lithium ion conductive polymer having a porosity in the range of 10% to 80%. In the cell of the present invention, the electrolyte is held not only in the pores of the microporous polymer but also within the polymer itself. Consequently, lithium ions can move not only through the pores of the microporous polymer film but through the polymer itself. The cell of the present invention, which contains a microporous polymer having interconnected pores, shows greatly improved high-rate charge/discharge characteristics especially when the microporous polymer is used in combination with an electrode comprising an active material which expands and contracts upon charge and discharge, because volume changes of the active material cause flows of the electrolyte through the pores of the microporous polymer and the flows carry lithium ions.

Nonaqueous polymer cell

Lithium compound and nickel oxyhydroxide containing a transition metal (Me) such as V, Cr, Mn, Fe, Zn and Co are suspended in water or in an organic solvent, and the solution is reacted with each other in an autoclave by a hydrothermal method to thereby synthesize transition metal-containing lithium nickelate.

Method for producing positive active material of lithium secondary

A positive active material for lithium battery, includes a lithium-containing amorphous nickel oxide represented by a chemical composition formula of Li.sub.x NiO.sub.2 ; wherein x is from greater than 0.25 to 2. Preferably, x is from greater than 1 to 2. More preferably, x is from greater than 1.4 to 2. The positive active material may contains cobalt from 2 to 60 mol % {(Co/(Ni+Co)}.

Positive active material for lithium battery, lithium battery having the

An inexpensive positive electrode active material for lithium batteries which comprises lithium manganate having a hexagonal layered structure with space group of R3m and exhibits continuous discharge voltage characteristics between 4.5 V and 2 V for metallic lithium.

Positive electrode active material for lithium battery, method for

A positive active material for a non-aqueous cell comprising a lithium-manganese composite oxide having an oxygen-defect type spinel structure and its preparing process are disclosed. A cell comprising the positive active material for a non-aqueous cell has excellent properties with high discharge capacity, a monotonous variation of the potential without flection during both charging and discharging, and very limited loss of the electric capacity upon charging and discharging.

Positive electrode for non-aqueous cell

A nonaqueous polymer battery includes a lithium ion conductive polymer having pores, a positive active material, and a carbonaceous negative active material. In the nonaqueous polymer battery, the positive active material is represented by Li.sub.1-x CoO.sub.2 (0.ltoreq.x.ltoreq.1) wherein the molar ratio of the carbon atoms in the negative active material to the cobalt atoms in the positive active material is 7.5 or lower; the positive active material is represented by Li.sub.1-x NiO.sub.2 (0.ltoreq.x.ltoreq.1) wherein the molar ratio of the carbon atoms in the negative active material to the nickel atoms in the positive active material is less than 10; or the positive active material is represented by Li.sub.1-x Ni(Co)O.sub.2 (Li.sub.1-x NiO.sub.2 having not more than 20% of the nickel atoms thereof displaced with cobalt ions; 0.ltoreq.x.ltoreq.1) wherein the ratio of the number of the moles of the carbon atoms present in the negative active material to the total number of the moles of the cobalt atoms and the nickel atoms present in the positive active material is less than 10.

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Kyoto, Japan

Hideo Yasuda