Hitachi, Ltd.

Nof Corporation

Takeshi Yabe

Shin Nishimura

Takefumi Okumura

Norio Iwayasu

Shoichi Yokoyama

Tetsuya Itoh

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). 

Lithium secondary battery

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: 

Boron-containing compound, ion-conductive polymer and polyelectrolyte for electrochemical devices

A process for producing a boric acid ester compound which comprises esterifying a compound represented by the formula (1):X&#x2014;[O(AO)&#x2014;H]&#x2003;&#x2003;(1)wherein X represents a group independently selected from a residue of a compound having 1 to 6 hydroxyl groups, an acryloyl group and a methacryloyl group with a boron-containing compound represented by the formula (2):(RO)&#x2014;B&#x2003;&#x2003;(2)wherein R represents an alkyl group having 1 to 4 carbon atoms. The present invention can provide a boric acid ester compound which has a high ion conductivity, which is useful as a material for an electrochemical device, such as a secondary battery or a capacitor, having excellent safety and which is low in water and impurity contents, a polymer electrolyte containing the boric acid ester compound, and a secondary battery using the polymer electrolyte.

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Kawasaki, Japan

Takeshi Yabe