In the previous article, we briefly introduced the properties of PVDF and its traditional application field - coatings. Today we will introduce its new application areas: lithium battery and photovoltaic backsheet protection film.
1. PVDF in lithium battery applications
PVDF is widely used in lithium batteries, it can be used as binder, dispersant, electrolyte, diaphragm coating, diaphragm, etc. At present, it is mainly used as binder for positive electrode. PVDF binder has good thermodynamic, electrochemical and mechanical properties, it is the most commonly used and mainstream binder for lithium batteries at present. Suspension polymerization of PVDF has better swelling characteristics and higher melting point, which is more suitable for use as cathode binder. In the short term, it is difficult to shake the status of PVDF as the mainstream cathode binder, and there is still a long way to go for the commercialization of other binders. In addition, PVDF can also be used as excellent diaphragm material, both for diaphragm coating and as diaphragm material.
2. PVDF in the field of photovoltaic applications
PVDF in the field of photovoltaic is mainly used for photovoltaic backsheet. Photovoltaic backsheets are in the outermost layer of photovoltaic modules and are used to protect crystalline silicon wafers from water vapor and oxygen erosion. PV power stations are exposed to wind and sand, ultraviolet rays, high temperature and water vapor for a long time, the protective material is easy to aging and cracking, and after cracking, it will lose its protective ability, resulting in the shortening of PV life. And PV power stations usually need to be used for 25 years, so the performance of the protective film after long-term use is particularly important. In this way, PVDF naturally enters people's vision. On the one hand, PVDF's UV resistance and chemical resistance are inherently stronger, while PVDF's better densification and strong resistance to wind and sand make it more suitable for harsh outdoor environments; on the other hand, PVDF's strong flame-retardant ability reduces the probability of fires. In 2019, PVDF's market share in the field of photovoltaic backsheets reached 54%.
In 2022, as PVDF becomes more and more important in emerging applications, the proportion of PVDF consumed in the traditional coating field is decreasing to only 30%. In the same year, the proportion of PVDF consumed by lithium batteries rose to 39% from 8% in 2017; and the proportion of PVDF consumed by photovoltaic backsheet membranes rose from 3% to 6%. This all shows that the PVDF industry is undergoing great changes, and we believe that in the future, PVDF can also shine in more applications.
Fluoroplastics Series:
Fluoroplastics Series (1) - Yize Mould had successfully design and manufacture PFA tube fittings
Fluoroplastics Series (2) - What are the Applications of PFA?
Fluoroplastics Series (3) - What are the similarities and differences between PFA and PTFE?
Fluoroplastics Series (4) - What are the applications of PTFE?
Fluoroplastics Series (5) - What is PVDF?
Fluoroplastics Series (6)--New Applications of PVDF
Fluoroplastics Series (7) - FEP performance
