IMPROVED LAMINATED MULTILAYER MEMBRANE, SEPARATOR, BATTERY, AND METHOD

• Main Authors: XIAO KANG KAREN, KRISTOFFER K STOKES, ZHANG XIAOMIN, ERIC ROBERT WHITE, PAUL VIDO, ROBERT A NARK, JEON INSIK, ZHANG JIANMING
• Format: Patent
• Language: English; Japanese
• Published: 09.09.2021
• 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

To provide a microporous multilayer separator membrane which contains one or more polypropylene layers and polyethylene layers, which has sufficient tensile and/or mechanical strength and which has low pin removal force that may enable high production yield rates in a battery cell winding process.SOLUTION: A microporous polyolefin lithium battery separator includes a dry process microporous multilayer laminated separator membrane. The separator membrane includes: at least two outer layers, each of which contains a polyethylene, a polyethylene blend, a polyethylene copolymer, or mixtures thereof; and at least one inner layer which contains a polypropylene, a polypropylene blend, a polypropylene copolymer, or mixtures thereof.SELECTED DRAWING: Figure 1 【課題】１つ以上のポリプロピレン層及びポリエチレン層を含有し、十分な引張強さ及び／又は機械的強度を有し、蓄電池の巻回工程において高い製造歩留まりを可能にするようにピン除去力が低い微多孔質多層セパレータ膜を提供する。【解決手段】微多孔質ポリオレフィンリチウム電池セパレータにおいて、乾式微多孔質多層積層セパレータ膜を備え、前記セパレータ膜が、少なくとも２つの外側層であり、それぞれ、ポリエチレン、ポリエチレンブレンド、ポリエチレン共重合体、若しくはこれらの混合物を含む前記外側層と、ポリプロピレン、ポリプロピレンブレンド、ポリプロピレン共重合体、若しくはこれらの混合物を含む、少なくとも１つの内側層と、を備える前記セパレータである。【選択図】図１