Diaphragms required for lithium-ion batteries
The diaphragm’s performance determines the interface structure and internal resistance of the battery. This determines its capacity, safety performance, charge density, and performance during a cycle.
These characteristics must be fulfilled:
Chemical stability is excellent: Resistance to organic solvents.
Excellent mechanical properties, high tensile strengths and high puncture resistance.
Excellent thermal stability. Low thermal shrinkage. High film breaking temperature.
The electrolyte’s wettability is good for compatibility and low liquid absorption.
aluminium oxide, a type of inorganic material, is good for ceramic coatings on battery diaphragms.
Ceramic diaphragms used for alumina:
1. Particle size is consistent, so they can be glued well to the diaphragm.
2. Alumina’s purity is high and it can be used without introducing impurities that could affect the internal environment of the batteries.
3. It is necessary for alumina crystal to be compatible with an electrolyte.
Benefits of coating aluminum diaphragms:
Resilience to extreme temperatures
It is resistant to extreme high temperatures, and retains its original shape above 180 degrees Celsius.
An alumina-coated battery can reduce the acidity and safety by neutralizing the HF present in the electrolyte.
A solid solution of nano-alumina is possible in lithium battery. This can enhance the cycle efficiency and magnification.
Nanometer-sized alumina powder is very liquid absorbent and retains liquid well.
Unique self-turn-off characteristics:
Polyolefin diaphragms have a closed cell design to prevent thermal runaway.
Low self-discharge rate:
Because of its curvature, micropores are more curvy with alumina than they would be without the coating. Also, self-discharge rates of alumina coated diaphragms are lower than those of common diaphragms.
Increase the lifespan of the cycles by increasing the number of cycle lives.
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