BU-306: What is the Function of the Separator? – Battery ...
Jan 08, 2019· In ca. 2008, further improvements were made by adding a ceramic-coated separator. Ceramic particles do not melt and this addition provides a further safety level. Ceramic coating is also used on lithium cobalt oxide (LCO) cells that charge up to 4.40V/cell instead of the traditional 4.20V/cell.