Low electrical resistance microporous battery separator membranes, separators, cells, batteries, and related methods
US11075429B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2020 |
| Grant date | Jul 27, 2021 |
| Priority date | — |
| Expiry date | Jul 21, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.