Toyota Jidosha Kabushiki Kaisha

Kansai Paint Company, Ltd.

Machiko Abe

Koji Takahata

Hideki Hagiwara

Koji Endo

Kosuke Iwase

Atsuya Kato

Atsushi Tsukamoto

Junji Akahane

Takeshi Abe

Akira Tsujiko

Akihiro Ochiai

Akira Saito

Yohei Shindo

Takanori Ito

Sachio Takeda

Keiko Wasada

Kazuyuki Kuwano

Masahiro Yoshioka

Yuichi Ito

Kentaro Komabayashi

Atsunao Hiwara

Yoshinori Tochino

Yuta Sarukawa

You Kato

A method of producing a lithium ion secondary battery includes preparing an alkaline negative electrode composite material including a negative electrode active material, a binder, an alkaline component, and an aqueous solvent; adding an oxalate complex lithium salt that is acidic in the aqueous solvent to the alkaline negative electrode composite material; and applying the negative electrode composite material to which the oxalate complex lithium salt is added to a surface of a negative electrode current collector and drying the negative electrode composite material to form a negative electrode active material layer.

Method of producing lithium ion secondary battery

The present invention provides a conductive paste for positive electrodes of lithium-ion batteries and a mixture paste for positive electrodes of lithium-ion batteries that are inhibited from increasing in viscosity and gelling, and that have an easy-to-apply viscosity. The conductive paste of the present invention contains a dispersion resin (A), polyvinylidene fluoride (B), conductive carbon (C), a solvent (D), and a dehydrating agent (E).

Conductive paste and mixture paste for lithium ion battery positive electrode

This invention relates to a conductive paste for lithium-ion battery positive electrodes and a mixture paste for a lithium ion battery positive electrode that have an easy-to-apply viscosity, even when a relatively small amount of a dispersion resin is incorporated. More specifically, the invention provides a conductive paste for lithium-ion battery positive electrodes, the conductive paste comprising a dispersion resin (A), conductive carbon (B), and a solvent (C), the dispersion resin (A) containing a resin (A1), the resin (A1) containing, as one constituent component, a polymerizable unsaturated group-containing monomer (A1-1) represented by a specific formula.

Conductive paste for lithium-ion battery positive electrodes and mixture paste for lithium-ion battery positive electrodes

The present invention provides a conductive paste for positive electrodes of lithium-ion batteries and mixture paste for positive electrodes of lithium-ion batteries that have an easy-to-apply viscosity, even when a relatively small amount of a dispersant is incorporated. More specifically, the present invention provides a conductive paste for positive electrodes of lithium-ion batteries containing a dispersion resin (A), conductive carbon (B), and a solvent (C), the dispersion resin (A) being a copolymer of a monomer mixture comprising a polycyclic aromatic hydrocarbon-containing monomer (A-1) in an amount of 1 to 70 mass %, based on the total solids content.

A nonaqueous secondary batteryA has a negative electrode sheetA in which a negative electrode active material layerA is held by a negative electrode current collectorA. Contained within the negative electrode active material layerA is a binderwhich includes a rubber-based binder or a resin having a binder function. The rubber-based binder or the resin having a binder function is abundantly present, within the negative electrode active material layerA, in a surface vicinity Aof the negative electrode active material layerA.

Nonaqueous secondary battery

Provided is a non-aqueous electrolyte secondary battery in which the effect achieved by adding an oxalate complex compound is suitably exhibited and which can achieve battery characteristics during normal usage and resistance to overcharging at high levels. This battery is provided with an electrode body obtained by laminating a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer. A coating film which is derived substantially from an oxalate complex compound and which contains boron atoms and/or phosphorus atoms is formed on the negative electrode active material layer. In addition, in the negative electrode active material layer that constitutes the electrode body, the standard deviation (&#x3c3;) of resistance values, which are measured at a plurality of points at equal intervals in a line direction extending linearly from one prescribed layering surface to the layering surface on the opposite side, is 3.0 to 7.2.

Non-aqueous electrolyte secondary battery and method for producing same

A lithium ion secondary batteryA has negative electrode active material particlesA which include graphite particles that are at least partially covered by an amorphous carbon film. The negative electrode, active material particlesA have a TG weight-loss-on-heating onset temperature Twhich satisfies the condition 500&#xb0; C.&#x2266;T&#x2266;615&#xb0; C. and a micro-Raman G-band half-width Gh which satisfies the condition 20&#x2266;Gh&#x2266;28. This configuration makes it possible to obtain a lithium ion secondary batteryA in which the reaction resistance in a low-temperature environment can be kept low.

Lithium ion secondary battery

Provided is a lithium-ion secondary battery having an excellent initial capacity as well as a good capacity retention rate. The battery comprises a positive electrode comprising a positive electrode active material, a negative electrode comprising a negative electrode active material, and a non-aqueous liquid electrolyte. The negative electrode active material comprises a graphitic material that satisfies each of the following properties: (a) in its Raman spectrum obtained by Raman scattering analysis using an exciting light at a wavelength of 532 nm, having a ratio of its D-peak intensity Ito its G-peak intensity I, an R value (I/I), of 0.15 or smaller; and (b) having a full width at half maximum of the G peak, &#x394;v, of 23 cmor smaller. The secondary battery has a capacity retention rate of 70% or greater when subjected to 500 cycles of charging and discharging at a constant current rate of 2 C at 60&#xb0; C.

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Okazaki, Japan

Machiko Abe