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Impact of separator on lithium battery performance

From:CTECHI GROUP Limited     Release time:2020-01-02

Overview:The diaphragm itself is not only a poor conductor of electrons, but also has the characteristics of passing electrolyte ions. The separator material must have good chemical and electrochemical stability, good mechanical properties, and maintain high wettability to the electrolyte during repeated charge and discharge processes. The interfacial compatibility between the separator material and the electrode, and the electrolyte retention of the separator have important effects on the charge and discharge performance and cycle performance of the lithium battery.

Impact of separator on lithium battery performance

The diaphragm itself is not only a poor conductor of electrons, but also has the characteristics of passing electrolyte ions. The separator material must have good chemical and electrochemical stability, good mechanical properties, and maintain high wettability to the electrolyte during repeated charge and discharge processes. The interfacial compatibility between the separator material and the electrode, and the electrolyte retention of the separator have important effects on the charge and discharge performance and cycle performance of the lithium battery.

Separator materials commonly used in lithium batteries include fiber paper or non-woven fabrics, and porous membranes made of synthetic resin. Common separators include polypropylene and polyethylene porous membranes. The basic requirement for separators is high stability in electrolyte. Because polyethylene and polypropylene microporous membranes have higher porosity, lower electrical resistance, higher tear strength, better resistance to acids and alkalis, good elasticity and retention of aprotic solvents, The separator material of lithium battery is mainly polyethylene and polypropylene microporous membrane. Polyethylene and polypropylene separators have the disadvantage of poor affinity for electrolytes. To this end, they need to be modified, such as grafting hydrophilic monomers on the surface of polyethylene and polypropylene microporous membranes or changing the electrolyte Organic solvents. The polyolefin separators currently used are all thinner. Other materials are used as lithium battery separators. If anyone has found that cellulose composite film materials have good lithium ion conductivity and good mechanical strength, they are also used as lithium battery separator materials.


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