Toray Industries, Inc.

Koki Miyazono

Eiichiro Tamaki

Yasuo Kubota

Manabu Kawasaki

Jian Wang

Peiyu Sun

Hanxiao Yang

Yoshihide Hirai

Takashi Konishi

Yusuke Kawabata

Ning Du

Yutaka Katayama

An object of the present invention is to improve the electron conductivity and ion conductivity of the surface of a positive electrode active material to provide a lithium ion battery having high capacity and high output. The present invention relates to a positive electrode for a lithium ion secondary battery, including a mixture layer containing a positive electrode active material for a lithium ion secondary battery and graphene, wherein the mixture layer has a percentage of abundance of silicon composing a siloxane bond in total elements of 0.4 atomic % or more as measured by X-ray photoelectron spectroscopy.

Positive electrode for lithium ion secondary battery, graphene/positive electrode active material composite particles, manufacturing methods for same, and positive electrode paste for lithium ion secondary battery

A graphene/organic solvent dispersion liquid is in a stably dispersed state and also unlikely to cause electrolysis of water. A graphene/organic solvent dispersion liquid is also provided including graphene dispersed in an organic solvent and having a value of (W2&#x2212;W1)/G in the range of 0.005 or more and 0.05 or less, wherein W1 and W2 are the water fractions measured at 130&#xb0; C. and 250&#xb0; C., respectively, by the Karl Fischer's method and G is the solid fraction of the graphene.

Graphene/organic solvent dispersion and method for producing same, and method for producing lithium-ion battery electrode

Provided are a laminate that has high smoothness, planar homogeneity, and substrate adhesion and undergoes little change in physical properties even if degradation of surface quality due to physical contact in use has occurred, and a method for producing the homogeneous laminate in a convenient manner in a small number of steps. A laminate includes a substrate made of a polymer material and a partially oxidized thin layer graphite piece layer including partially oxidized thin layer graphite pieces and having an average thickness to of 3.0 nm to 10,000 nm, the layer being formed on the substrate and bonded to the substrate via a chemical bond.

Layered product and process for producing same

Provided is a graphene composite primarily used as a conductive additive for forming an electrode for lithium ion batteries, which has performance equal to or higher than conventional dispersants and is deceased in cost by using an inexpensive and easily available dispersant. The graphene composite includes a graphene powder and a compound having a structure of pyrazolone.

Graphene composite, method for producing graphene composite and electrode for lithium ion battery containing graphene composite

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Otsu, Japan

Koki Miyazono