Hitachi, Ltd.

Hitachi Maxell, Limited

Nof Corporation

Norio Iwayasu

Shin Nishimura

Takefumi Okumura

Takeshi Yabe

Hidetoshi Honbo

Jinbao Zhao

Shoichi Yokoyama

Yuki Okuda

Tetsuya Itoh

Hidetoshi Honbou

Yuuki Okuda

A negative electrode material, for lithium ion secondary batteries, that has a high Li ion conductivity and improves the lithium ion secondary batteries in cycle characteristic. The negative electrode material includes: a negative electrode active material including silicon and/or a silicon compound; and a polymer represented by a chemical formula (1): wherein: A is a functional group having an amide group (&#x2014;CONH&#x2014;) and a sulfo group (&#x2dc;SO3X); X represents an alkali metal or hydrogen (H); B is a functional group having a polar functional group; R1 to R6 are each a hydrocarbon group having 1 to 10 carbon atoms or hydrogen (H); x and y are composition proportions, respectively, in the polymer that is a copolymer, and satisfies 0&#x3c;x(x+y)&#x2264;1.

Negative electrode material for lithium ion secondary batteries, negative electrode for lithium ion secondary batteries using same, lithium ion secondary battery and battery system

In the present invention, a compound represented by Formula (1) is used as an additive of electrolytic solution for a lithium secondary battery, 

Additive of electrolytic solution for lithium secondary battery, electrolytic solution for lithium secondary battery using the same and lithium secondary battery

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

Provided is a lithium ion rechargeable battery less suffering from swelling even when stored at high temperatures. Disclosed are a cathode active material, a cathode for a lithium ion rechargeable battery using the cathode active material, and a lithium ion rechargeable battery using the cathode. The cathode active material includes particles, each of the particles including a cathode material capable of intercalating and deintercalating lithium ions, and a film formed on at least part of surfaces of the particles. The film includes a compound represented by Chemical Formula (1). Examples of the compound represented by Chemical Formula (1) include lithium squarate and dilithium squarate. Preferably, the lithium ion rechargeable battery is a prismatic battery.

Cathode active material and lithium ion rechargeable battery using the material

There is provided a lithium ion secondary battery which suppresses overcharge while keeping battery characteristics. The lithium ion secondary, batter, has positive and negative electrodes facing each other via a separator and being filled with an electrolytic solution with a supporting electrolyte dissolved in a non-aqueous solvent, wherein the electrolytic solution contains overcharge inhibitor.

Lithium ion secondary battery and overcharge inhibitor for same

A polymerizable boric compound for electrochemical devices represented by the formula (1), wherein, B represents a boron atom, Z represents a polymerizable functional group, X represents a divalent Chydrocarbon group or in the absence of X, Z and B form a direct bond, AO represents a Coxyalkylene group, m and n are each the number of moles of the oxyalkylene group added and each independently stands for 2 or greater but less than 6, and Rand Reach represents a Chydrocarbon group. 

Polymerizable boric compounds, methods of producing the same, polymerizable compositions and ionic-conductive polymeric electrolytes

The object of the present invention is to provide a lithium secondary battery of high output. According to the present invention, there is provided a lithium secondary battery having a positive electrode and a negative electrode which reversibly intercalate and deintercalate lithium and an electrolyte containing an ion conductive material and an electrolytic salt, where said electrolyte contains an electrolytic salt and a boron-containing compound represented by the following formula (1) or a polymer thereof, or a copolymer of the compounds of the following formulas (2) and (3). 

An object of the present invention is to provide a boron-containing compound capable of forming an ion-conductive polyelectrolyte having high ion-conductive properties, and a polymer of said compound. According to the present invention, there are provided a polymerizable boron-containing compound of (formula 1), a polymer thereof, a polymer of a compound of (formula 2) and a compound of (formula 3), and a polyelectrolyte for electrochemical device comprising either of these polymers and at least one electrolyte salt: 

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Hitachinaka, Japan

Norio Iwayasu