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Can four new materials for lithium-ion battery pack separators meet the needs of technological development? As a key material for lithium-ion battery packs, the separator plays a role in electronic isolation. In the field of technological development, traditional polyolefin separators can no longer meet the current needs of lithium-ion battery packs. High porosity, high thermal resistance, high melting point, high strength, and good wettability of electrolyte are the future development directions of lithium-ion battery pack materials.

Below, the editor will talk about four new materials for lithium-ion battery pack separators, can they meet the needs of technological development?

1、 In order to improve the safety of lithium-ion batteries and ensure their safe and stable operation, the separator must meet the following conditions:

1. Chemical stability: does not react with electrolytes or electrode materials

2. Infiltrability: Easy to infiltrate with electrolytes without elongation or contraction

3. Thermal stability: It can withstand high temperatures and has a high degree of fuse isolation

4. Mechanical strength: Good tensile strength to ensure constant strength and width during automatic winding

5. Porosity: Higher porosity to meet the demand for ion conductivity

2、 In response to the development needs of lithium-ion battery pack material technology, researchers have developed four new types of lithium-ion battery pack separator materials on the basis of traditional polyolefin separators.

Material 1: meta aramid

PMIA is an aromatic polyamide with benzamide branched chains on its skeleton, which has a thermal resistance of up to 400 ℃. Due to its high flame retardant performance, the use of this material as a separator can improve the safety performance of batteries.

In addition, due to the relatively high polarity of carbonyl groups, the membrane has high wettability in the electrolyte, thereby improving the electrochemical properties of the membrane. Make it commercially viable.

Material 2: Polyethylene terephthalate

Polyethylene terephthalate (PET) is a material with excellent mechanical, thermodynamic, and electrical insulation properties. The most representative product of PET diaphragms is a composite film developed by Degussa Company in Germany, which is based on PET diaphragms and coated with ceramic particles. It exhibits excellent heat resistance and a closed cell temperature of up to 220 ℃.

The melting point of electrospun PET membrane is much higher than that of PE membrane, at 255 ℃, with a maximum tensile strength of 12Mpa, a porosity of 89%, a liquid absorption rate of 500%, which is much higher than the Celgard membrane on the market, and an ion conductivity of 2.27 × 10-3Scm-1, and its cycling performance is also better than that of Celgard membrane. After 50 cycles of battery cycling, the porous fiber structure of PET membrane still remains stable.

Material 3: Polyphenylene benzodiazole

The new polymer material PBO (poly (p-phenylenebenzodiazole) is an organic fiber with excellent mechanical properties, thermal stability, and flame retardancy. Its matrix is a linear chain structure polymer that does not decompose below 650 ℃, with ultra-high strength and modulus, making it an ideal heat-resistant and impact resistant fiber material.

Due to the extremely smooth surface and strong physical and chemical inertness of PBO fibers, their morphology is difficult to change. PBO fibers are only soluble in 100% concentrated sulfuric acid, methylsulfonic acid, fluorosulfonic acid, etc. After strong acid etching, the original fibers on PBO fibers will peel off from the main trunk, forming a segmented morphology, which improves the specific surface area and interfacial bonding strength.

Material 4: Polyimide

Polyimide (PI) is also one of the polymers with excellent comprehensive performance, with excellent thermal stability, high porosity, and good high-temperature resistance. It can be used for a long time at -200~300 ℃.

Due to the strong polarity of PI and good wettability of electrolyte, the diaphragm produced exhibits excellent liquid absorption rate. The PI diaphragm manufactured by electrospinning has lower impedance and higher rate performance compared to the Celgard diaphragm. After 100 cycles of charging and discharging at 0.2C, the capacity retention rate is still 100%.

Summary: The performance of lithium-ion battery pack separators determines the interface structure, internal resistance, and other characteristics of the battery, directly affecting its capacity, cycling, and safety performance. Excellent separators play an important role in improving the overall performance of the battery. The newly developed diaphragm materials mentioned above hope to meet the needs of technological development. Of course, the research and development of lithium-ion battery pack materials cannot stop here. The stable performance and excellent technology of lithium-ion battery packs have won unanimous praise from users in various industries, and the service is also excellent! If you need it, you can consult our customer service online.

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