Kuraray Co., Ltd.

Tokyo University of Science Educational Foundation Administrative Organization

Junji Fujioka

Hideharu Iwasaki

Jun-Sang Cho

Naoki Fujiwara

Yuki Ohta

Toshimitsu Tanaka

Shinichi Komaba

Taketoshi Okuno

Naoaki Yabuuchi

Kyomi Tajima

A hardly graphitizable carbonaceous material can be used in a negative electrode material for nonaqueous electrolyte secondary batteries (for example, a lithium ion battery) having not only high charge capacity but also high charge-discharge efficiency and being fully charged to be used and a method for producing the same. Such hardly graphitizable carbonaceous material may have an oxygen element content of 0.25% by mass or less.

Hardly graphitizable carbonaceous material for nonaqueous electrolyte secondary batteries fully charged to be used, method for producing same, negative electrode material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery fully charged to be used

The present invention pertains to: a non aqueous electrolyte battery binder composition containing a polyamine and a neutralized salt of an &#x3b1;-olefin-maleic acid copolymer obtained through copolymerization of an &#x3b1;-olefin and maleic acid; and a non aqueous electrolyte battery slurry composition, a non aqueous electrolyte battery negative electrode, and a non aqueous electrolyte battery, etc., using the non aqueous electrolyte battery binder composition.

Non aqueous electrolyte battery binder composition, and non aqueous electrolyte battery slurry composition, non aqueous electrolyte battery negative electrode, and non aqueous electrolyte battery using same

The present invention pertains to a slurry composition for non aqueous electrolyte battery electrodes that includes a binder composition, an active material, and a solvent, in which the active material is a lithium-containing metal oxide, the binder composition contains a neutralized salt of an &#x3b1;-olefin-maleic acid copolymer in which an &#x3b1;-olefin and a maleic acid are copolymerized, and the degree of neutralization for carboxylic acid generated from the maleic acid in the copolymer is from 0.3 to 1.0. The present invention further pertains to a non aqueous electrolyte battery positive electrode and a non aqueous electrolyte battery using the slurry composition for non aqueous electrolyte battery electrodes.

Slurry composition for non aqueous electrolyte battery electrode, and non aqueous electrolyte battery positive electrode and non aqueous electrolyte battery using same

An objective of the present invention is to provide a gel polymer electrolyte composition which exhibits excellent electrolyte retaining ability, excellent ion conductivity, higher mechanical strength and excellent shape preservation, which does not require an extra step for crosslinking, and which can provide a secondary battery with excellent cycle properties and a vinyl acetal polymer used for a gel polymer electrolyte composition. There are provided a vinyl acetal polymer for a gel polymer electrolyte composition, wherein the vinyl acetal polymer has a cationic functional group, as well as a gel polymer electrolyte composition comprising the vinyl acetal polymer and an electrolyte solution, wherein a weight ratio of the vinyl acetal polymer to the electrolyte solution is 0.5:99.5 to 9:91.

Gel polymer electrolyte composition

There are provided a battery electrode wherein an active material layer is formed on a collector surface, and the layer contains an active material and a block copolymer having a vinyl alcohol polymer block; and a lithium ion secondary battery having a laminate structure in which a pair of electrodes having an active material layer are disposed in such a manner that the active material layers face each other via a separator, and an electrolyte composition containing a lithium-containing electrolyte salt fills the gaps between the pair of electrodes and the separator, wherein at least one of the pair of electrodes is the above battery electrode. Thus, there can be provided a lithium ion secondary battery which can be easily produced and be less polarized, exhibiting excellent charge/discharge properties and cycle characteristics.

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Kurashiki, Japan

Junji Fujioka