Introduction to lithium ion battery separators and types

What is a lithium-ion battery separator? In the structure of a lithium-ion battery, the separator is one of the key internal components. The performance of the diaphragm determines the interface structure and internal resistance of the lithium-ion battery, and directly affects the battery's capacity, cycle, and safety performance. A diaphragm with excellent performance has an important purpose to improve the overall performance of the battery. The important purpose of the separator is to separate the positive and negative electrodes of a lithium-ion battery to prevent short-circuiting due to contact between the two electrodes. In addition, it also has the function of allowing electrolyte ions to pass through. The diaphragm material is non-conductive, and its physical and chemical properties have a great influence on the performance of the battery. Different types of batteries have different separators. Regarding the lithium-ion battery series, since the electrolyte is an organic solvent system, a separator material resistant to organic solvents is required. Generally, high-strength thin-film polyolefin porous membranes are used. According to different physical and chemical characteristics, lithium-ion battery separator materials can be divided into woven membranes, non-woven membranes (non-woven fabrics), microporous membranes, composite membranes, membrane paper, and laminated membranes. Types of Lithium-ion battery separators Lithium-ion battery separators can be divided into different types according to their structure and composition. There are currently three important and common types in the market, namely porous polymer membranes, non-woven membranes and inorganic composite membranes. 1. Porous polymer membrane refers to a lithium ion battery separator with uniform pore distribution prepared by mechanical methods, thermally induced phase separation methods, immersion precipitation methods and other methods. 2. The non-woven diaphragm is composed of oriented or random fibers, and is usually combined with organic matter or ceramic gel to obtain a lithium-ion battery diaphragm with better chemical and physical properties. 3. Inorganic composite membranes are mostly lithium ion battery separators obtained by combining inorganic nanoparticles and high polymers. 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. Previous post: What is the status quo of the recycling of used batteries in my country