Zeon Corporation

Atsuhiro Kanzaki

Takao Suzuki

Haruhisa Yamamoto

Kouichirou Maeda

Katsuya Nakamura

A slurry composition for a positive electrode for a lithium ion secondary battery, comprising a polymer A wherein a HOMO value by a semiempirical method molecular orbital calculation is &#x2212;13.5 eV to &#x2212;10 eV and a content of ethylene repeating units is 30 mol % to 95 mol %; a polymer B wherein a HOMO value by a semiempirical method molecular orbital calculation is &#x2212;13.5 eV to &#x2212;10 eV, a glass transition temperature is &#x2212;80&#xb0; C. to 0&#xb0; C., and a gel content is 50 wt % or more; an active material for a positive electrode; a conductivity adding agent; and a liquid medium C in which the polymer A dissolves but the polymer B does not dissolve. According to the composition, a lithium ion secondary battery having a large battery capacity, a good charge/discharge cycle characteristic and an improved rate characteristic can be realized.

Slurry composition for secondary cell positive electrode, secondary cell positive electrode and secondary cell

A binder for a lithium ion secondary battery characterized by comprising a polymer containing structural units derived from 1,3-butadiene, said polymer having a 1,2-vinyl structure content in the range of 2% to 25% by mole. A lithium ion secondary battery provided with an electrode made using this binder exhibits improved characteristics at repetition of charge-discharge cycle and improved storage stability.

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Tokyo, Japan

Atsuhiro Kanzaki