Separators Using High Temperature Polymer Reinforcements and Ceramic Particles for Improved Safety and Robustness under Extreme Temperature Use and Abuse Conditions

摘要

Porous Power Technologies (PPT) has developed and is commercializing several versions of a unique, high performance lithium battery separator with higher porosity (60-80%), higher power (2-4 times higher discharge rates) and reduced capacity fade (up to 100% higher cycle life) compared to conventional lithium ion battery separators. In addition to these benefits from lower impedance and improved energy efficiency, PPT's baseline SYMMETRIX~R separators have also shown remarkable safety characteristics, comparable to or better than the current commercial polyolefin separators. In some cases the need for further improvements in performance, cost and durability (especially for larger capacity cells typical to electric drive vehicles, aerospace applications and grid power storage systems) may still be required. To this end, PPT has engineered a new 3rd generation of separator technology that employs both a high temperature (>220°C) non-woven polymer web reinforcement as well as a ceramic filler additive. Together these insure excellent resistance to temperature and overcharge abuse, along with dimensional stability and electrolyte resistance to over 100°C. These microporous membrane designs also retain good physical properties even after 180°C temperatures.