Battery Separator

A porous membrane placed between electrodes of opposite polarity, permeable to ionic flow but preventing electric contact of the electrodes.

The considerations that are important and influence the selection of the separator include the following:

In most batteries, the separators are either made of nonwoven fabrics or microporous polymeric films. Batteries that operate near ambient temperatures usually use organic materials such as cellulosic papers, polymers, and other fabrics, as well as inorganic materials such as asbestos, glass wool, and SiO2. In alkaline batteries, the separators used are either regenerated cellulose or microporous polymer films. Lithium batteries with organic electrolytes mostly use microporous films.

The type of separator can be divided into the following groups:


Pankaj Arora and Zhengming Zhang, "Battery Separators", Chem. Rev. 2004, 104, 4419-4462

See also: Battery, Lithium Ion Battery.

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Subjects: Electrochemistry