About the decomposition of lithium battery separator

In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the battery's interface structure, internal resistance, etc., and directly affects the battery's capacity, cycle, and safety performance. A separator with excellent performance has an important purpose for improving the overall performance of the battery. The important purpose of the separator is to separate the positive and negative electrodes of the battery to prevent short-circuiting of the two poles in contact, and also has the function of allowing electrolyte ions to pass through. The material of the diaphragm is non-conductive, and its physical and chemical properties have a great influence on the performance of the battery. Since the performance of the lithium battery separator determines the key characteristics of the lithium battery, such as the capacity, cycle performance, charge and discharge current density, etc., the separator is required to have an appropriate thickness, ion permeability, pore size and porosity, and sufficient chemical stability. Performance such as thermal stability and mechanical stability. According to different physical and chemical characteristics, lithium battery separator materials can be divided into woven membranes, non-woven membranes (non-woven fabrics), microporous membranes, composite membranes, membrane paper, and laminated membranes. Polyolefin materials have excellent mechanical properties, chemical stability and relatively inexpensive characteristics. Therefore, polyolefin microporous membranes such as polyethylene and polypropylene have been used as lithium battery separators in the early stage of power lithium battery research and development. Although other materials are used to prepare lithium battery separators, it is still important to use polyethylene and polypropylene microporous membranes as materials for commercial lithium battery separators. Solid and gel electrolytes began to be used as a special component, and at the same time play the role of electrolyte and battery separator, it is an emerging technical means. Lithium battery separators are battery supporting materials encouraged by the state to develop. They are in line with the National Guidelines for Priority Development of High-Tech Industrialization and are also included in the frontiers listed in the National Medium and Long-term Science and Technology Development Plan (2006-2020) Technical items: High-efficiency secondary battery materials and key technology topics in high-efficiency energy material technology. The 2008 National 863 Program listed the key technology research of low-cost lithium battery separators as a key industrialization-oriented project. 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 are the differences between the composition of lithium battery electrolyte and battery electrolyte?