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Analysis of the main difference between non woven membrane and traditional diaphragm

  • Author:Junqian Nonwoven
  • Source:Junqian Nonwoven
  • Release on :2018-11-28
Analysis of the main difference between nonwoven membrane and traditional diaphragm

First, in terms of materials, PP / PE andnonwoven fabric(China Spun Bonded Non Woven Supplier) (in this case, PET nonwoven fabric) use polymer materialshaving different glass transition temperatures. Simply put, the glasstransition temperature of PP / PE is lower than room temperature, and as thetemperature increases, the film material becomes softer (strictly, themolecules are locally accelerated).

For example, the internal temperature ofthe battery is about 60 °C during charging and discharging, the electrode will repeatedlyexpand and contract, and the PP / PE film will gradually become smaller againand again under the action of shrinkage stress.

China Spun Bonded Non Woven Supplier, Non Woven Polyester Fabric Wholesale, Non Woven Polyester Material Factory

However, with PET nonwoven fabric(Non Woven Polyester Fabric Wholesale), theglass transition temperature is above 80 ° C, which not only softens with increasing temperature, but alsostabilizes the porosity well and makes the battery cycle life longer.

In fact, the same phenomenon has beenconfirmed when using nickel-hydrogen batteries.

China Spun Bonded Non Woven Supplier, Non Woven Polyester Fabric Wholesale, Non Woven Polyester Material Factory

High-rate nickel-metal hydride batteries,the internal temperature of the battery will exceed 100 °C, using a general diaphragm,or a nylon material of a general diaphragm, under the conditions of D-type 200battery discharge, only a few charge and discharge cycles, the diaphragm willquickly degenerate.

If you use a special nylon diaphragm with ahigh glass transition temperature, battery life can be leaps and bounds.

In the future, many facts will be continuously verified in experiments. For example, a non-woven membrane(Non Woven Polyester Material Factory) made ofglass fiber can also be used for lithium ion batteries, as well as PP / PEmicroporous membranes. Large, but the time of lithium-ion battery is mainlyused for cameras and mobile phones. The thickness of the diaphragm is thin andhas a closed-cell function, which leads to the development of microporousmembranes.