Back to results
US 12,603,321 B2Granted
Battery separators, electrodes, cells, lithium batteries and related methods
AssigneeCelgard, LLC
InventorsZhengming Zhang, Weifeng Fang
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeCelgard, LLC
InventorsZhengming Zhang, Weifeng Fang
Estimating the term…
An improved battery separator and an energy cell comprising the improved battery separator are provided. The improved battery separator comprises a porous membrane having at least one of the following properties when wet with electrolyte: has no or low volume; has no or low mass; soaks as much liquid electrolyte as possible; blocks or removes any harmful substances in the electrolyte; never melts at any high temperature; does not react with the cathode or the anode under any conditions; has a mechanical strength equal to or greater than steel; is an electronic insulator under any conditions; and blocks metal dendrite growth.
A battery separator comprising a dry process porous membrane comprising polyethylene and having pores having an average pore size of less than 1 micron, wherein the dry-process porous membrane comprises multiple layers which are co-extruded wherein each layer has a thickness from 0.1 to 0.9 microns, wherein the pores are formed via this dry process and are subsequently filled with an ionic conductive medium, wherein the ionic conductive medium comprises gel electrolyte, and wherein the separator has a JIS Gurley of 75 to 300, wherein the dry process porous membrane contains no residual solvent or processing oil, and wherein the separator conducts lithium ions when dry (no electrolyte).
Dependencies are inferred from the claim text.