High-Safety Battery Separator Equipment

High-Safety Battery Separator Equipment

The separator in lithium-ion batteries acts as a barrier between the positive and negative electrodes, permeable to ions and preventing electric contact between them.dry process battery separator equipment In the course of battery operation, the separator undergoes physical abuse and chemical abuse, such as mechanical puncture and damage and combustive interaction with flammable electrolyte. These events can trigger internal short circuits and thermal runaway in the battery. Therefore, a high-safety separator with good mechanical and thermal properties is of crucial importance to the long-term stable performance of lithium-ion batteries.

To ensure the safety of the battery, the current state-of-the-art separators are designed to be fireproof.dry process battery separator equipment To achieve this, they are typically layered with a thin ceramic membrane and/or a polymeric film. The ceramic membrane can effectively isolate the combustible electrode material and convert the violent oxidation reaction to a mild, gradual exothermic one. The polymeric film can further increase the flame retardancy of the separator.

However, the above approaches have some drawbacks.dry process battery separator equipment They are difficult to manufacture in large scale and often require complex production processes, resulting in high costs. Furthermore, they are not able to prevent metal dendrite penetration. Thus, a new type of separator with improved functionalities is needed to meet the requirements for the commercial application of LIBs in large scale.

The development of high-safety separators requires advanced preparation or modification methods, intelligent technology, and a new understanding of the function of the separator. Aiming at this, we should keep pace with The Times and actively embrace the development trend of science and technology to accelerate the research process and improve the separation capability in practical applications.

There are several ways to enhance the safety of separators, such as surface coating, grafting, inorganic particle fillers, and self-assembly. The most common method is surface coating, which consists of a layer of inorganic ceramic particles on a polymer film. The surface of the ceramic particles is modified with an inorganic compound to enhance its mechanical strength, wettability, and ionic conductivity.

Another method is to add inorganic ceramic particles directly as fillers to polymer separators to fabricate composite membranes. This strategy can significantly improve the ionic conductivity and electrical stability of the separators. The inorganic fillers also have a strong affinity for the electrolyte, which reduces the battery’s internal resistance and increases its power density.