Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Hidetoshi Honbo

Tatsuo Horiba

Katsunori Nishimura

Mamoru Mizumoto

Yasushi Muranaka

Seiji Takeuchi

Akihiro Gotoh

Yoshito Ishii

Hideto Momose

Norio Iwayasu

Jinbao Zhao

Juichi Arai

Kouichi Takei

Manabu Kobayashi

Hiroshi Kimura

Shuichi Suzuki

Masahiko Ogino

Akihiro Miyauchi

Takashi Ando

Kenichi Souma

Yoshiyuki Takamori

Satoru Funaki

Shuko Yamauchi

Masanori Yoshikawa

Noriaki Arakawa

Takeo Yamagata

Yuki Okuda

Yuuki Okuda

An electrolyte includes a mixture of polymerizable compounds, or a polymer, in which the mixture includes a polymerizable compound having an aromatic functional group and a polymerizable functional group, and a polymerizable compound having a phosphorus-containing functional group that contains phosphorus, and having a polymerizable functional group, and in which the polymer has residues of each of the phosphorus-containing functional group, the aromatic functional group and the polymerizable functional group.

Lithium secondary battery

A nonaqueous electrolytic solution which may suppress the overcharge of a battery and a nonaqueous electrolyte secondary battery using the solution are provided. The overcharge of the battery is suppressed by undergoing the electrolytic polymerization in the solution when the battery is overcharged, and simultaneously more effectively suppressed by increasing the internal resistance of the battery. The nonaqueous electrolytic solution comprises a polymer which undergoes the electrolytic polymerization in the range of 4.3V or more to 5.5V or less at the lithium metal standard voltage, having a repeating unit represented by the formula (1), an electrolytic salt and a nonaqueous solvent. 

Nonaqueous electrolytic solution and nonaqueous electrolyte secondary battery using the same

An overcharge inhibitor is provided which increases an internal resistance of a battery, being electropolymerized by reaction with a positive electrode at a high potential in overcharging. The overcharge inhibitor is produced by using a polymer containing a polymerizable monomer as a repeating unit. The polymerizable monomer has a functional group that is electropolymerized at a potential of 4.3 to 5.5 V based on a lithium metal reference.

Overcharge inhibitor, and nonaqueous electrolyte solution and secondary battery using the same

The present invention provides an electrolyte membrane for a fuel cell that has a minute projection cluster on one side or both sides of a polymer electrolyte membrane. Further, the present invention provides a production method of an electrolyte membrane for a fuel cell, wherein a mold comprising convex portions having a fixed planar pattern is pressed on one side or both sides of a polymer electrolyte membrane, then while concave portions of the polymer electrolyte membrane formed in the concave portions are being stretched, the mold is removed from the polymer electrolyte membrane for forming a minute projection cluster.

Electrolyte membrane for fuel cells, its production and fuel cell using the same

Artificial graphite particles, having a secondary particle structure in which a plurality of primary particles composed of graphite are clustered or bonded together, and having a layer structure in which the edge portion of the primary particles is bent in a polyhedral shape.

Artificial graphite particles and method for manufacturing same, nonaqueous electrolyte secondary cell negative electrode and method for manufacturing same, and lithium secondary cell

Artificial graphite particles and method for manufacturing same, nonaqueous electrolyte secondary cell, negative electrode and method for manufacturing same, and lithium secondary cell

Objects of the present invention is to provide a carbon material having a superior reversibility in lithium intercalation-deintercalation reaction, and a non-aqueous secondary battery using the carbon material as an active material for a negative electrode, which has a high energy density and an excellent rapid charging and discharging characteristics. Graphite powder having a maximum particle diameter of less than 100 &#x3bc;m and an existing fraction of rhombohedral structure in the crystalline structure of less than 20% is used as an active material for the negative electrode of the non-aqueous secondary battery. The graphite powder can be obtained by pulverizing raw graphite with a jet mill, and subsequently treating the powder at a temperature equal to or higher than 900&#xb0; C.

Non-aqueous secondary battery having negative electrode including graphite powder

Provided is a carbon material having a superior reversibility in lithium intercalation-deintercalation reaction, and a non-aqueous secondary battery using the carbon material as an active material for a negative electrode, which has a high energy density and an excellent rapid charging and discharging characteristics. Graphite powder having a maximum particle diameter of less than 100 &mgr;m and an existing reaction of rhombohedral structure in the crystalline structure of less than 20% is used as an active material for the negative electrode of the non-aqueous secondary battery. The graphite powder can be obtained by pulverizing raw graphite with a jet mill, and subsequently treating the powder at a temperature equal to or higher than 900&deg;C.

Non-aqueous secondary battery and a method of manufacturing graphite powder

A carbon material is provided having a superior reversibility in lithium intercalation-deintercalation reaction, and a non-aqueous secondary battery is provided which uses the carbon material as an active material for a negative electrode, which has a high energy density and an excellent rapid charging and discharging characteristics. Graphite powder having a maximum particle diameter of less than 100 &mgr;m and an existing fraction of rhombohedral structure in the crystalline structure of less than 20% is used as an active material for the negative electrode of the non-aqueous secondary battery. The graphite powder can be obtained by pulverizing raw graphite with a jet mill, and subsequently treating the powder at a temperature equal to or higher than 900&deg; C.

A lithium secondary battery suitable for use as a power source for a secondary battery using system such as an electric automobile, motor bicycle or portable equipment includes a negative electrode (17) composed of a carbon material including carbon particles carrying fine particles of a metal which forms an alloy with lithium. The carbon particles have a face-to-face dimension which is 3.354 to 3.369 .ANG. and a crystal grain size in a C-axis direction which is equal to or greater than 300 .ANG.. The metal forming an alloy with lithium has a particle size which is equal to or smaller than 1000 .ANG.. With the use of the charge/discharge capacity of an alloy of the metal and lithium, a value exceeding the theoretical capacity 372 mAh/g of graphite can be obtained. The lithium secondary battery is capable of discharge with an output energy density equal to or higher than 350 W/kg.

Secondary battery using system and material for negative electrode of

A lithium secondary battery having a high energy density, a long life, a low cost, an improved safety and a high output density uses a high crystalline carbon or an amorphous carbon bearing fine particles of a metal which forms an alloy with lithium, and a metal which does not form any alloy with lithium, in the range of 5-10% by weight, as a material for the negative electrode thereof.

Lithium secondary battery having negative electrode of carbon material

A high-efficiency, compact and low-cost electric power storage air-conditioning system incorporates inside its air-conditioner an electric power storage unit including a battery which is electrically interconnected to a d.c. system of the air-conditioner. Charging of the battery is controlled to be executed only during a steady operation of the air-conditioner when its load is light. Since a d.c. voltage of the battery is used directly as a d.c. voltage to drive the air-conditioner, a high efficiency, minimized loss and economical operation conditioning system is achieved.

Electric power storage air-conditioning system

A treating fluid is in contact with a negative electrode containing lithium of a lithium cell under a first condition to react a surface portion of the negative electrode, and a treating fluid is in contact with lithium existing inside an article formed on the surface of the above-described negative electrode under a second condition. The cells can be effectively treated under safety condition to collect either the valuable substances, or the cell constructive components.

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Hitachinaka, Japan

Hidetoshi Honbo