Introduction of polymer auxiliary materials for lithium batteries

Lithium battery is a commonly used secondary battery with the advantages of high energy density, long cycle life, low self-discharge rate and environmental protection, so it is widely used in electric vehicles, mobile devices and energy storage systems. In order to improve the performance and safety of lithium batteries, polymer auxiliary materials have been introduced into lithium batteries to play an important role.

Polymer auxiliary materials mainly include polymer electrolytes, diaphragm materials and conductive additives. Polymer electrolyte is the most commonly used polymer auxiliary material in lithium batteries, which is used to replace the traditional inorganic electrolyte. Polymer electrolytes have the advantages of high ionic conductivity, low crystallinity and good mechanical properties, which can improve the conductivity and safety of lithium batteries. Currently the more widely used polymer electrolytes mainly include polyacrylonitrile (PAN), polyethylene oxide (PEO) and polyacrylonitrile-lithium salt complex (PAN-LiX).

Diaphragm material is an important component used to isolate positive and negative electrodes in lithium batteries, which mainly plays a role in preventing direct short-circuit of electric charge. Traditional diaphragm materials are mainly polyolefin and polyimide materials, but with the development of battery technology, polymer composite materials are widely used in diaphragm materials. Polymer composites have excellent thermal stability, ionic conductivity and mechanical strength, which can improve the cycle life and safety of lithium batteries.

Conductive additive is a commonly used polymer auxiliary material, mainly used to improve the conductivity of lithium batteries. The conductive additives in lithium batteries are usually based on polymer carbon materials, such as graphene, carbon nanotubes and polyaniline. These polymer carbon materials have excellent conductivity and chemical stability, which can effectively improve the conductivity and cycle life of lithium batteries.

Overall, polymer auxiliary materials play an important role in lithium batteries, which can improve the conductivity, safety and cycle life of lithium batteries. With the continuous development and innovation of lithium battery technology, the research and application of polymer auxiliary materials will be further expanded to provide more room for improving the performance and reliability of lithium batteries.