The meaning and use analysis of lithium battery separator

The separator, as the name implies, plays the function of separating the positive and negative plates, guards against the direct contact and short circuit of the positive and negative plates of the lithium battery, and also plays the function of ion conduction and insulation. Different types of batteries have different separators. Regarding the lithium battery series, since the electrolyte is an organic solvent system (organic solvents are a large class of organic compounds that are widely used in life and processing, and have a small molecular weight. They are often found in coatings, adhesives, lacquers and detergents. Organic solvents are used), so organic solvent-resistant membrane materials are required, so high-strength thin-film polyolefin porous membranes are generally used. With the current development of power lithium battery technology, the requirements for diaphragms are getting higher and higher. As a separator, the basic functions to be satisfied have the following points: (1) It has electronic insulation and ensures the mechanical separation of positive and negative electrodes. (2) It has a certain pore size and porosity to ensure low resistance and high ionic conductivity, and has good permeability to lithium ions. (3) It is resistant to electrolyte corrosion and has sufficient chemical and electrochemical stability. This is because the solvent of the electrolyte is a strong polar organic compound. (4) It has good electrolyte wettability and strong liquid absorption and moisturizing ability. (5) High mechanical stability, including puncture strength, tensile strength, etc., but the thickness is as small as possible. The diaphragm is an important part of the lithium battery, and it is an important component that supports the battery pack to complete the charging and discharging process and the electrochemical process. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.