Teijin Limited

Teijim Limited

Satoshi Igarashi

Satoshi Nishikawa

Takahiro Daido

Hiroyoshi Minematsu

Hiroyuki Honmoto

Hiroo Inata

Yuji Tamura

Tatsuichiro Kon

Kazuo Yahata

Kenji Nakatani

Hiroyuki Fujishima

Youji Yanagi

Horinori Matsuda

Yasushi Kitagishi

A separator, used for a lithium ion secondary battery that produces electromotive force by lithium doping/dedoping, which is composed of a porous film comprising an organic polymer (component A) which can swell in an electrolyte solution to retain it, surrounding a nonwoven fabric which cannot swell in the electrolyte solution, the porous film including an electrolyte solution non-swelling organic polymer with a melting point of 210&#xb0; C. or above (component B) and an electrolyte solution non-swelling organic polymer with a melting point of 180&#xb0; C. or below (component C), wherein component B is incorporated in the fiber composing the nonwoven fabric. The separator is highly safe and exhibits low reduction mechanical properties with respect to organic solvents.

Separator for lithium ion secondary battery

A process for production of a composite porous film wherein a porous support, of which both sides have been coated with a solution (dope) of an organic polymer compound in a water-soluble organic solvent to form a coated film, is passed through an air gap step and conveyed into a coagulating bath comprising water or a mixture of water with the same solvent as the organic solvent, and is then immersed in the coagulating bath so that the coated film on both surfaces of the porous support directly contact the coagulating bath for coagulation, and is then washed and dried. This production process is suitable for production of non-aqueous secondary battery separators, and yields non-aqueous secondary battery separators with good handling properties and at low cost, whereby the ion permeability, adhesion with electrodes and electrolyte solution retention can be strictly controlled.

Process for production of composite porous film

A lithium ion secondary battery including a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte, where the separator essentially includes a porous sheet. The positive electrode active material and the negative electrode active material can be reversibly doped and dedoped such that, where Qp (mAh) is an electric charge necessary for causing total lithium contained in the positive electrode to be dedoped and Qn (mAh) is an electric charge necessary for causing lithium to fully dope the negative electrode, Qp>Qn. Further, when the battery is charged at a charging current Ic (mA) in a range of 0.2 Qn/h<Ic<2 Qn/h, in a range of an electric charge for charging Qc (mAh) of 1<Qc/Qn<Qp/Qn, doping of the positive electrode by lithium is initiated by producing lithium particles on the negative electrode by charging of the battery until Qc<Qp.

Lithium secondary cell, separator, cell pack, and charging method

A transparent conductive sheet comprises a silicon oxide gas barrier layer, an organosilicon compound-containing solvent-resistant layer and a transparent conductive layer laminated in that order on one side of a transparent plastic substrate, or a polyvinyl alcohol-based resin gas barrier layer and a solvent-resistant layer laminated in that order, over an anchor coat layer.

Transparent conductive sheet

A liquid crystal film comprising a light-transmitting resin matrix and liquid crystal droplets dispersed therein, characterized in that

Liquid crystal film

Growing community of inventors

Iwakuni, Japan

Satoshi Igarashi