A battery separator is a nonwoven fabric (or a membrane)
that acts as a barrier between the positive and
negative electrodes. Despite being an electrical insulator,
it has to be porous to allow ion mobility [1,2]. Depending
on the battery type and on the specific performance
required, it can be manufactured using different production
technologies and from a range of raw materials
(fibers, polymers, binders, inorganic particles). Components
are selected according to chemical properties,
physical properties and economic factors.