Application Characteristics Of Silicon Dioxide For Battery Separator

Silica features high content, uniform particle size and good activity. Adding a certain proportion of battery specific silicon dioxide to the battery can greatly improve the electrochemical performance of the battery, such as mechanical performance, conductivity, elongation at break, cycle performance, life, etc., so silicon dioxide has high application value in the battery field.

Application characteristics of Silica special for battery separator:

1. The colloidal electrolyte prepared with silica has strong gel capacity, suitable viscosity, soft gel electrolyte, good thixotropy, moderate three-dimensional network structure of colloid, low resistance, large discharge current, high capacitance, no hydration stratification, and can greatly increase the cycle life of colloid.

2. Adding silica in the separator can increase the pore size and the total amount of colloidal electrolyte. Effectively prevent electrolyte delamination, reduce corrosion rate and improve service life. Adding silica can improve the tensile strength of the separator and reduce the pore diameter of the separator; When the pressure on the partition is greater than 30kPa, the liquid absorption of the partition added with silica exceeds that of the pure glass wool partition;

3. The secondary lithium battery separator made by adding silicon dioxide into the composite polymer has high liquid absorption, conductivity and toughness. The electrolyte absorption rate is 184.4%, the room temperature conductivity is 1.20mS/cm, and the elongation at break is 163%. The specific capacity of the secondary lithium battery assembled by composite polymer membrane containing silica is 834.8 mAh/g for the first discharge, 400 mAh/g for the 40th discharge, and the cycle efficiency is above 99.8%, showing good electrochemical performance.

4. Silica can reduce the crystallization rate of polymer system and keep it in amorphous state for a longer time.

5. The granular silicon dioxide between the positive and negative plates can maintain the consistency of electrolyte in the battery and the holes that can pass through oxygen, significantly reducing the dry water fault.

6. The conductivity of P (VDF-HFP) - based microporous polymer electrolytes can be improved by adding silica in situ.

7. Silica particles can absorb the water in the liquid electrolyte and reduce the interface reaction.

8. By adding silica powder into polymer lithium battery, the microstructure, mechanical and electrical properties of electrolyte membrane can be greatly improved, so that the electrolyte membrane has good conductivity and mechanical strength.

Recommended dosage: 0.2-2%. The customer department will select the dosage according to the actual situation.

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