Structure and properties of ultra-fine glass fiber separators

This kind of separator is composed of ultra-fine glass fibers with a diameter of 0.5~4um without any organic binder. The non-compressed glass fiber paper is made by the papermaking method, and its structure is multi-layered mat-like, and relatively small and high labyrinth free channels are formed by disordered glass fibers. The separator has significantly better performance than ordinary battery separators in many aspects. 

    Overall, it has the following main features:     

1. High liquid absorption, fast liquid absorption, good hydrophilicity, absorbs and maintains the electrolyte required for the rated capacity of the battery, and maintains its high liquid absorption rate throughout its life;

2. Large surface area and high porosity. As long as the electro-liquid is poor, it can ensure that the oxygen generated by the positive electrode diffuses to the negative electrode through the separator and combines with the sponge lead on the negative electrode;

3. Small pore size, which can effectively prevent battery short circuit and dendrite penetration;

4. High chemical purity, less harmful impurities; 

5. Has very good acid resistance and oxidation resistance; 

6. Low resistivity.

    The main factors affecting the performance of ultra-fine and ultra-fine glass fiber separators:     

• Influence of chemical composition of ultrafine glass fiber The chemical composition of glass wool is a key factor affecting the performance of the separator, which directly affects the chemical performance of the separator. 

  
  

• Influence of the diameter and length of ultra-fine glass fiber cotton The smaller the diameter of the ultra-fine glass fiber, the larger the surface area and the higher the wettability, so the liquid absorption rate is large, the pore size of the separator is also small, and the resistance to dendrite penetration is strong, but its The resistance value will increase accordingly, so an optimal combination must be chosen. The length of the fiberglass wool also affects the performance of the separator. When the cotton is long, the fibers are not easily dispersed and flocculate, which makes the separator uneven; when the cotton is short, the uniform performance of the separator is improved, but the strength is low, so an optimal length range should be selected.

  
  

• Effects of Harmful Impurities in Ultrafine Glass Fiber Wool Impurities in glass fiber wool have a direct impact on the performance of the separator. The presence of iron, copper, nickel and other metals or metal ions in glass fiber wool will increase the self-discharge and gas evolution of the battery. Therefore, raw materials with less harmful impurities must be selected to ensure good performance of the separator.

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