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Cross non woven fabric/ Cambrella Fabric
The main difference between non-woven diaphragm and current traditional diaphragm
by：Sunshine
2021-04-06
First of all, from the point of view of materials, PP/PE and non-woven fabrics (here refers to PET non-woven fabrics) use polymer materials with different glass transition temperatures. To put it simply, the glass transition temperature of PP/PE is below normal temperature. As the temperature rises, the film material will become softer and softer (strictly speaking, it is the temperature at which the molecules accelerate locally).
For example, when the internal temperature of the battery is charged and discharged at about 60℃, the electrode will expand and contract repeatedly, and the porosity of the PP/PE separator will gradually decrease under the influence of repeated contraction stress.
However, in the case of using PET non-woven fabric, its glass transition temperature is above 80 ℃. As the temperature rises, it will not become soft, but it can also maintain a stable porosity, so that the battery’s Longer cycle life.
In fact, the same phenomenon has been verified in the use of Ni-MH batteries.
When the high-rate Ni-MH battery is working, when the internal temperature of the battery exceeds 100℃, use a general diaphragm or a general nylon diaphragm. Under the condition of 200A discharge of the D-type battery, only charge and discharge several times Circulation, the diaphragm will quickly deteriorate.
If a special nylon separator with a high glass transition temperature is used, the battery life will be greatly improved. Sanyo Electric has published the results of this research.
In the future, many facts will continue to be verified in experiments. Just like the original non-woven membrane made of glass fiber, it can also be used in lithium-ion batteries, as well as PP/PE microporous membranes. At the beginning, it was considered that the pore size and porosity were large, but the lithium-ion batteries at that time were mainly used in cameras and mobile phones. The requirements for the diaphragm were thin thickness and closed pore function, which made the development of microporous membranes occupy certain advantages.
For example, when the internal temperature of the battery is charged and discharged at about 60℃, the electrode will expand and contract repeatedly, and the porosity of the PP/PE separator will gradually decrease under the influence of repeated contraction stress.
However, in the case of using PET non-woven fabric, its glass transition temperature is above 80 ℃. As the temperature rises, it will not become soft, but it can also maintain a stable porosity, so that the battery’s Longer cycle life.
In fact, the same phenomenon has been verified in the use of Ni-MH batteries.
When the high-rate Ni-MH battery is working, when the internal temperature of the battery exceeds 100℃, use a general diaphragm or a general nylon diaphragm. Under the condition of 200A discharge of the D-type battery, only charge and discharge several times Circulation, the diaphragm will quickly deteriorate.
If a special nylon separator with a high glass transition temperature is used, the battery life will be greatly improved. Sanyo Electric has published the results of this research.
In the future, many facts will continue to be verified in experiments. Just like the original non-woven membrane made of glass fiber, it can also be used in lithium-ion batteries, as well as PP/PE microporous membranes. At the beginning, it was considered that the pore size and porosity were large, but the lithium-ion batteries at that time were mainly used in cameras and mobile phones. The requirements for the diaphragm were thin thickness and closed pore function, which made the development of microporous membranes occupy certain advantages.
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