Toray Industries, Inc.

National University Corporation Kagawa Univesity

Yasuo Kubota

Eiichiro Tamaki

Hiroaki Kawamura

Peiyu Sun

Gang Wu

Zhenqi Wu

Gangqiao Liu

Koki Miyazono

Hanxiao Yang

Miyuki Tabayashi

Jian Wang

Masaaki Tokuda

Tomoyuki Yuba

Tetsuo Yamashita

Ryoji Konishi

Natsuko Chayama

Mayumi Hara

Toshiyuki Nonaka

Ning Du

Miyuki Matsushita

Yusuke Kawabata

Yutaka Katayama

Hironobu Tsuji

Junsuke Igarashi

Tokumi Maruyama

Hiroaki Kosaka

Ikuko Tsukamoto

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

A method is provided for producing polyanionic positive electrode active material composite particles, which comprises: a step 1 wherein precursor composite granulated bodies, each of which contains a polyanionic positive electrode active material precursor particle in graphite oxide, are formed by mixing a polyanionic positive electrode active material precursor and graphite oxide; and a step 2 wherein the precursor composite granulated bodies obtained in step 1 are heated at 500&#xb0; C. or higher in an inert atmosphere or in a reducing atmosphere. The maximum intensity of the X-ray diffraction peak based on the positive electrode active material is less than 50% of the maximum intensity of the X-ray diffraction peak based on the materials other than the positive electrode active material. The maximum intensity of the X-ray diffraction peak based on the positive electrode active material is 50% or more of the maximum intensity of the X-ray diffraction peak based on the materials other than the positive electrode active material.

Method for producing polyanionic positive electrode active material composite particles, and polyanionic positive electrode active material precursor-graphite oxide composite granulated bodies

A method for producing an active material particle for a lithium ion battery, the method including steps of: flowing a plurality of raw material solutions into respective raw material-feeding channels under a pressure of 0.3 to 500 MPa, the solutions being capable of inducing a chemical reaction when mixed, thereby producing an active material particle for a lithium ion battery or an active material precursor particle for a lithium ion battery; and mixing the plurality of raw material solutions at a junction of the raw material-feeding channels to induce the chemical reaction, thereby continuously producing an active material particle for a lithium ion battery or producing an active material precursor particle for a lithium ion battery.

Method for producing lithium ion cell active material particles

A conventional positive electrode material for lithium ion batteries that is made of positive electrode active material/graphene composite particles has low graphene material ion conductivity and is incapable of providing favorable battery performance. In the present invention, positive electrode active material/graphene composite particles are conferred with high electron conductivity and ion conductivity by formation of an appropriately functionalized graphene/positive electrode active material composite, and are capable of yielding a high-capacity/high-output lithium ion secondary battery when used as a positive electrode active material for a lithium ion battery.

Positive electrode active material/graphene composite particles, positive electrode material for lithium ion cell, and method for manufacturing positive electrode active material/graphene composite particles

In order to prepare a highly conductive and highly dispersible graphene powder and to obtain an electrode for a lithium ion battery with excellent performance utilizing the highly conductive and highly dispersible graphene, a graphene powder and a preparation method thereof is provided. The graphene powder comprises a compound having a catechol group adsorbing on the surface of graphene in a weight ratio of 5-50% relative to the grapheme and the element ratio of oxygen to carbon in the graphene powder measured by X-ray photoelectron spectroscopy is 0.06 or more and 0.20 or less. The method for producing a graphene powder comprise the step of reducing a graphite oxide with a reducing agent having no catechol group in the presence of a compound having a catechol group.

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

The present invention relates to preparation of a highly dispersible graphene powder. Further, the present invention includes providing an electrode for a lithium ion battery having good output characteristics and cycle characteristics by utilizing a highly dispersible graphene powder. The present invention also includes providing a graphene powder having a specific surface area of 80 m/g or more to 250 m/g or less as measured by BET measurement, and an oxygen-to-carbon element ratio of 0.09 or more to 0.30 or less as measured by X-ray photoelectron spectroscopy.

Graphene powder, electrode paste for lithium ion battery and electrode for lithium ion battery

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

The present invention makes a lithium ion secondary cell exhibit high capacity when lithium manganese phosphate is used as the active material of the lithium ion secondary cell. The present invention is directed to lithium manganese phosphate nanoparticles having a ratio I/Iof the peak intensity at 20&#xb0; to the peak intensity at 29&#xb0; obtained by X-ray diffraction of greater than or equal to 0.88 and less than or equal to 1.05, and a crystallite size determined by X-ray diffraction of greater than or equal to 10 nm and less than or equal to 50 nm.

Lithium manganese phosphate nanoparticles and method for manufacturing same, carbon-coated lithium manganese phosphate nanoparticles, carbon-coated lithium manganese phosphate nanoparticle granulated body, and lithium ion cell

The present invention provides a negative electrode material for a lithium ion secondary battery, a composite negative electrode material for a lithium ion secondary battery, a resin composition for a lithium ion secondary battery negative electrode, and a negative electrode for a lithium ion secondary electrode, which may provide high charge/discharge capacity, and excellent initial charge-discharge characteristics and capacity retention. The surfaces of core particles of silicon of 5 nm or more and 100 nm or less in average particle size are coated with a coating layer to use a negative electrode material containing substantially no silicon oxide in the coating layer, or a composite negative electrode material for a lithium ion secondary battery, which includes the negative electrode material and a matrix material, further with the use of a polyimide resin or a precursor thereof as a bonding resin, thereby making it possible to achieve high charge/discharge capacity and excellent capacity retention, as well as high initial efficiency.

Negative electrode material for lithium ion secondary battery, composite negative electrode material for lithium ion secondary battery, resin composition for lithium ion secondary battery, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

In order to prepare highly conductive and highly dispersible graphene and obtain an electrode for a lithium ion battery with good output characteristics and cycle characteristics, there is provided a graphene composition containing thiourea, the element ratio of sulfur to carbon being 0.04 or more and 0.12 or less in X-ray photoelectron spectroscopy measurement.

Highly dispersible graphene composition, preparation method thereof, and electrode for lithium ion secondary battery containing highly dispersible graphene composition

Provided are a graphene powder, a production method thereof, and an electrochemical device comprising the same. The graphene powder has an elemental ratio of oxygen atoms to carbon atoms of not less than 0.07 and not more than 0.13 and an elemental ratio of nitrogen atoms to carbon atoms of not more than 0.01. In the production method, the graphene powder is produced by using a dithionous acid salt as a reducing agent. Since the graphene has a low content of nitrogen atoms and a proper amount of oxygen atoms and a proper defect, the graphene is provided with good performance of both dispersibility and conductive property, and is usable as a good conductive additive, such as the one for a lithium ion battery electrode. The production method has the advantages of low cost, high efficiency and low toxicity.

Growing community of inventors

Otsu, Japan

Yasuo Kubota