| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe battery with a high shorting temperature by using a separator containing a base material made of fabric, nonwoven fabric, paper or porous film, heat resistant nitrogen-containing aromatic polymer, and ceramic powder. SOLUTION: A base material contains organic fiber and/or inorganic fiber and is 40 g/m2 or less in weight per a unit area and 70μm or less in thickness. Organic fiber is formed of thermoplastic polymer, while inorganic fiber is made of glass fiber. A separator contains 10 weight % or more of thermoplastic polymer melting at 260 deg.C or less, and the thermoplastic polymer is melted according to the increase of temperature so as to close cavities in the separator. Heat resistant nitrogen-containing aromatic polymer is aromatic polyimide or aromatic polyamide, while ceramic powder is metal oxide metal nitride, or metal carbide with a primary mean grain size of 1.0μm or less. A slurry solution, in which ceramic powder is dispersed in a polar organic solvent solution containing heat resistant nitrogen-containing aromatic polymer, is prepared so as to be applied to the base material and dried then. |
