SECONDARY BATTERY SEPARATOR AND SECONDARY BATTERY

• Main Authors: SUMIDA KATSUHIKO, YAMATO HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 23.05.2016
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

PROBLEM TO BE SOLVED: To provide: a secondary battery separator which enables the exhibition of superior battery characteristics as a secondary battery separator, which never shrinks or melts even when a battery suffers a high temperature, which has adequate heat resistance and enables the improvement of safety, and which has a shutdown function for safety measure at a high temperature of 270°C or higher; a method for manufacturing such a secondary battery separator; and a secondary battery arranged by use thereof.SOLUTION: A secondary battery separator comprises: a porous film laminate arranged by integration of a porous film or porous film and a support body. The porous film includes, as a primary component, a thermoplastic resin having a glass transition temperature of 190-250°C. The porous film has many pores communicating to each other. The pores have an average pore size of 0.01-10 μm. In the porous film, the average opening ratio is 30-80%. The separator has the value of an air permeability of 0.5-100 seconds, and a thickness of 10-50 μm.SELECTED DRAWING: Figure 1 【課題】二次電池用セパレータとして優れた電池特性を発揮し、電池の高温時にセパレータがシュリンクや溶融することなく、耐熱性が良く、安全性を改善することができ、２７０℃以上の高温となった際には安全対策のためのシャットダウン機能も有している二次電池用セパレータ及びその製造方法、そして、それを用いた二次電池の提供。【解決手段】多孔膜又は多孔膜と支持体を一体化した多孔膜積層体で構成された二次電池用セパレータであって、前記多孔膜は、主成分がガラス転移温度１９０〜２５０℃の熱可塑性樹脂であり、前記多孔膜は、連通性を有する多数の微小孔を有し、該微小孔の平均孔径が０．０１〜１０μｍであり、前記多孔膜の内部の平均開孔率が３０〜８０％であり、前記セパレータの透気度の値が０．５〜１００秒であり、前記セパレータの厚みが１０〜５０μｍである二次電池用セパレータ。【選択図】図１