Study on the conductivity and stability of PET nickel plated film in battery separators

With the development of new energy technologies, lithium-ion batteries have been widely used in electric vehicles and energy storage systems due to their high energy density and long cycle life. As one of the key components of lithium-ion batteries, the battery separator plays a crucial role in the safety and performance of the battery. Although traditional polyolefin membranes have good mechanical properties and chemical stability, they are prone to melting and shrinkage at high temperatures, leading to the risk of short circuits. in recent years,PET nickel plated filmAs a new type of diaphragm material, it has attracted the attention of researchers due to its excellent conductivity and stability. This article aims to explore the application of PET nickel plating film in battery separators and its impact on battery performance, and analyze it through experimental data.

Experimental Materials and Methods

The PET nickel plated film used in this study is composed ofAdvanced Institute (Shenzhen) Technology Co., LtdProvided, its main feature is a layer of nickel plating on the surface to enhance conductivity. In the experiment, PET nickel plated film was used as the separator material for lithium-ion batteries and compared with traditional polyethylene (PE) separators. The test content includes the cycling performance, rate performance, and thermal stability of the battery.

Experimental results and analysis

Comparison of conductivity performance

Through resistance measurement testing, we found that the surface resistance of PET nickel plated film is significantly lower than that of traditional PE diaphragm. Specific data shows that at room temperature, the surface resistance of PET nickel plated film is about 0.5 Ω/sq, while the surface resistance of PE separator is as high as 20 Ω/sq. This result indicates that,PET nickel plated filmIt can effectively reduce battery internal resistance and improve energy output efficiency.

Cycle performance testing

After 100 cycles of charging and discharging at 1C rate, the capacity retention rate of the battery using PET nickel plated film was 85%, while the capacity retention rate of the battery using PE separator was 75%. This indicates that PET nickel plating film helps to improve the cycling stability of batteries and extend their lifespan.

Amplification performance test

Charging and discharging tests were conducted under different rate conditions, and the results showed that when the charging rate increased from 0.5C to 2C, the discharge capacity of PET nickel plated film batteries only decreased by 10%, while the discharge capacity of PE diaphragm batteries decreased by 20%. This indicates that the performance of PET nickel plated film batteries is superior at high ratesPE diaphragm battery.

Thermal Stability Test

Through thermogravimetric analysis (TGA) testing, we observed that the PET nickel plated film maintained good structural stability below 200 ° C, while the PE membrane began to show significant quality loss at 120 ° C. In addition, in the thermal shock test, the PET nickel plated film did not show significant shrinkage, while the PE membrane exhibited significant shrinkage.

discuss

From the above experimental data, it can be seen that PET nickel plated film has significant advantages in conductivity and thermal stability, mainly because the presence of the nickel layer not only enhances the conductivity of the membrane, but also improves its structural stability in high temperature environments. This is of great significance for improving the safety and performance of lithium-ion batteries.

conclusion

This study shows that PET nickel plated film, as a new type of battery separator material, has excellent conductivity and thermal stability, and can improve the cycling and rate performance of lithium-ion batteries to a certain extent. Future research can further explore the potential application of PET nickel plating film in other types of batteries, as well as develop more efficient nickel plating processes to promote its widespread application in the field of batteries.

The above data is for reference only, and specific performance may vary due to production processes and product specifications.