Low electrical resistance microporous battery separator membranes, separators, cells, batteries, and related methods

• Main Authors: Zhang, Xiaomin, Shi, Lie
• Format: Patent
• Language: English
• Published: 27.07.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TRANSPORTING

Improved microporous battery separator membranes, separators, cells, batteries including such membranes, separators, cells, and/or methods of making such membranes and/or separators, and/or methods of using such membranes and/or separators are provided. In accordance with at least certain embodiments, an improved battery separator for a secondary or rechargeable lithium battery may have low electrical resistance of less than 0.95 ohm-cm2, or less than 0.8 ohm-cm2. The inventive battery separator membrane may provide a means to achieve an improved level of battery performance in a rechargeable or secondary lithium battery based on a possibly synergistic combination of low electrical resistance, low Gurley, low tortuosity, and/or a unique trapezoid shaped pore. In accordance with at least certain multilayer embodiments (for example, a trilayer membrane made of two polypropylene layers with a polyethylene layer in between), the inventive microporous membrane or battery separator has excellent onset and rate of thermal shutdown performance.