Toyota Jidosha Kabushiki Kaisha

Hiroyuki Akita

Harunari Shimamura

Hiroki Nagai

Masato Kamiya

Hitoshi Sakai

Shinji Suzuki

Hiroaki Ikeda

Takumi Tamaki

Ryuta Morishima

Hidehito Matsuo

Katsushi Saito

A nonaqueous electrolyte secondary battery () includes a porous film () (heat resistance layer (HRL)) in, which particles (filler F) of an insulating ceramic are attached through a binder onto a surface of at least one of a negative electrode active material layer () and a separator (). In the nonaqueous electrolyte secondary battery, the insulating ceramic of the porous film () contains at least one of Fe and Ni.

Nonaqueous electrolyte secondary battery

Provided is a nonaqueous electrolyte secondary batterywhich, in cases where separatorseach having a heat-resistant layeron only one face thereof are used, has an excellent thermal stability and thus a higher safety and reliability when the batteryreaches a high temperature. Such a nonaqueous electrolyte secondary batteryincludes a positive electrodein which a positive electrode active material layeris provided on both faces of a positive electrode current collector, a negative electrodein which a negative electrode active material layeris provided on both faces of a negative electrode current collector, at least two separatorseach having a heat-resistant layeron one face of a base material, and an electrolyte. The nonaqueous electrolyte secondary battery has an electrode assemblyin which the positive electrodeand the negative electrodeare stacked on top of one another with the separatorsinterposed therebetween. The at least two separatorsare disposed in such a way that, for each separator, the heat-resistant layeris positioned on the same side with respect to the base materialin the stacking direction.

Nonaqueous electrolyte secondary battery having separators with base material and heat-resistant layer on coiling outer peripheral side

This separator is provided at least at one surface thereof with a heat-resistant layer containing inorganic oxide particles and a binder, and the inorganic oxide particles have a component containing gallium in the range of 5 to 200 weight ppm in an aluminum oxide. This lithium ion secondary battery has: an electrode body including a positive electrode plate and a negative electrode plate laminated by interposing the separator therebetween; and a non-aqueous electrolytic solution impregnated in the electrode body. A lithium ion secondary battery using the separator having the heat-resistant layer is therefore less likely to cause a rise in resistance even in use under high-rate conditions.

Lithium ion secondary battery, separator thereof, and method for producing each of same

A method is provided for manufacturing an electrode that has a porous inorganic layer on the surface of an active material layer and is suitable for constructing a nonaqueous secondary battery with excellent input-output performance. In this manufacturing method, an electrode perform, which has an active material layer () consisting primarily of active material particles () and supported on a collector (), is prepared. The water concentration of at least the surface () of the active material layer () is adjusted to 100 ppm to 500 ppm. A slurry (S) containing inorganic particles (), a binder and an organic solvent is coated on the surface () of the active material layer with the water concentration thus adjusted, to form a porous inorganic layer.

Method for manufacturing nonaqueous secondary battery electrode

Growing community of inventors

Seto, Japan

Hiroyuki Akita