Nanoporous ultra-high molecular weight polyethylene membrane

Abstract

The application provides methods for producing a biaxially oriented nanoporous UHMWPE membrane. The method can include combining a petroleum jelly, an ultra-high-molecular- weight polyethylene (UHMWPE), and an antioxidant, forming a suspension, feeding the suspension into an extruder to produce a gel filament, pressing the gel filament to form a gel film, subjecting the gel film to an annealing temperature, and extracting the petroleum jelly from the gel film.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application Serial No. 62 / 423,764, filed November 17, 2016, and U.S. Provisional Patent Application Serial No. 62 / 529,334, filed July 6, 2017, each of which The entire contents of , including any figures, tables or drawings, are incorporated herein by reference. Background technique [0003] Lithium-ion batteries (LIBs) have many advantages and are crucial to address the energy shortage and environmental issues caused by the use of fossil fuels. However, LIBs still have hazards including fire and explosion. These problems can be caused by thermal runaway, where an increase in temperature triggers a further increase in temperature, mainly due to runaway exothermic reactions. Various types of safety devices, such as rupture valves, safety vents, hot-melt pressure-temperature coordination devices, and other circuit breakers are designed to enhance the reliabil...

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