The lithium-ion battery diaphragm has those roles?

An important function of the diaphragm of the lithium battery is to isolate the positive and negative poles and prevent electrons in the battery while allowing ions to pass, thereby completing the fast transmission between lithium ions between the positive and negative electrodes during electrochemical charge and discharge. The advantages and disadvantages of the diaphragm performance directly affect the discharge capacity of the battery, and therefore, it is necessary to give sufficient attention to the study and application of the diaphragm material, and can reduce the positive and negative electrode on the basis of effectively preventing the connection between the positive and negative poles. The distance between the distance is reduced. Lithium-ion batteries have a high requirements for diaphragm materials, first to meet the basic requirements of general chemical power supply, including: A, have a certain mechanical strength, ensuring that no rupture under battery deformation; B, good ion profile To reduce the internal resistance of the battery; C, excellent electron insulation, to ensure effective isolation between electrodes; D, the ability to resist chemistry and electrochemical corrosion, good stability in the electrolyte; E, the ability to absorb electrolyte Strong; f, low cost, suitable for large-scale industrial production; G, less impurity content, uniform performance, in addition to this, there are some special requirements: A, the thickness of the film must be thin to reduce the impedance of the battery; B, do not absorb moisture; C, there is a special hot melt, when the battery is abnormal, the diaphragm can be melt under the required temperature conditions, closing the micropores, turning into an ion insulator, making the battery. The diaphragm material of the lithium-ion battery is mainly a porous polyolefin such as the polypropylene separator produced by Celgard and the polyethylene film, and the copolymer of ethylene and propylene. These materials have higher porosity, lower resistance, high tear strength, preferably anti-acid base, good elasticity, and retention of apron solvent. There are two main methods for the preparation of lithium ion battery diaphragms, namely, melt stretching (MSCs) and thermal phase separation (TIPS). The MSCS process is relatively simple, and there is no pollution during the production process, which is the main method of producing separator materials in the world. The TIPS method needs to add and remove the diluent during the production process, and the production cost is high and accompanied by secondary pollution. Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery