Polyalcohol microporous barrier for high ratio polyalcohol lithium ion power cell

Abstract

The present invention relates to a polymer microporous membrane for high-rate polymer lithium-ion power battery. The polymer microporous membrane is mainly used in gel polymer lithium-ion power battery. The power battery can provide powered power supply for equipment of high energy consumption and large current discharge, such as an electric vehicle, an electric motorcycle, uninterruptible power supply and so on. The microporous membrane is made of polymer material, inorganic filler, plasticizer and organic solvent. The porosity rate is between 20 percent and 70 percent. After treatment, the microporous membrane can be transformed into electrolyte membrane; the high-rate gel polymer lithium-ion power battery can be made with a square-layered battery structure. The power battery has excellent high-rate charge and discharge performances and security performances.

Description

technical field [0001] The invention relates to a polymer microporous membrane for high-rate polymer lithium-ion power batteries, which is mainly used in gel polymer lithium-ion power batteries. The power batteries can be used for high energy consumption such as electric vehicles, electric motorcycles and uninterruptible power supplies , Provide power supply for equipment that requires high current discharge. Background technique [0002] As the world is facing increasingly serious environmental problems and future oil and other energy sources will be exhausted, seeking renewable energy has become an urgent task for mankind. Power battery, as one of the new green power sources that developed countries in the world focus on developing, has a good market application prospect in electric vehicles, electric motorcycles, electric tools, mobile electronic equipment, etc. The current power batteries mainly include lead-acid batteries, nickel-cadmium batteries and lithium-ion batte...

AI Technical Summary

Problems solved by technology

The polymer lithium-ion battery assembled with this polymer electrolyte membrane has excellent charge-discharge performance and cycle life, but it is not suitable for high-current charge-discharge, and cannot be used as a microporous membrane for high-rate lithium-ion power batteries.

[0004] The diaphragm is an important part of the lithium-ion battery. The PP / PE / PP film used in the liquid lithium-ion battery has high mechanical strength, but its own liquid absorption capacity is too poor to form a gel polymer electrolyte. It is easy to Leakage, poor safety

The PVDF-based gel polymer electrolyte has a good liquid absorption ability, which can prevent liquid leakage and other phenomena, and has better safety. However, its high rate performance cannot meet the needs of electric vehicles and needs to be further improved.