Three types of polymer lithium batteries

Polymer lithium batteries can be divided into three categories: 1. Solid electrolyte lithium batteries. The electrolyte is a mixture of polymer and salt. This battery has low ion conductivity at room temperature and is suitable for high temperature applications. 2. Gel polymer electrolyte lithium battery. That is, adding plasticizers and other additives to the solid polymer electrolyte, and then ionic conduction, so that the battery can be used at room temperature. 3. Polymer anode materials for lithium batteries. Using conductive polymer as the negative electrode material, its energy is three times that of existing lithium batteries, which is the latest generation of lithium batteries. By using solid electrolytes instead of liquid electrolytes, compared with liquid lithium batteries, lithium polymer batteries can have a thin shape, have any area of u200bu200bany shape and other benefits, and will not attack the safety problems of leakage and combustion explosion, so you can use Lushan Pingsu composite film makes the battery case, and then you can take the entire battery capacity; polymer lithium battery can also be used as a positive electrode polymer material, and its mass to energy ratio will be more than 50% higher than the current liquid lithium battery. In addition, polymer lithium batteries are more difficult than lithium batteries in terms of operating voltage and charge-discharge cycle life. The structure and principle of lithium batteries The important components of lithium batteries: (1) The positive active material mainly refers to lithium cobalt oxide, lithium manganate, lithium iron phosphate, lithium nickelate, lithium nickel manganate, etc. The conductive collector is generally used for The thickness of the aluminum foil is 10-20 microns; (2) The barrier is a special plastic film that allows lithium ions to pass through, but at the same time acts as an electronic insulator. There is also a type of inorganic solid gap, such as the gap of the alumina coating is an inorganic solid gap; (3) The negative electrode active material mainly refers to graphite, lithium titanate or carbon materials with a similar graphite structure. Conductive collecting liquid is generally used for copper foil thickness of 7-15 microns; (4) The electrolyte is usually an organic system, such as a carbonate solvent that dissolves lithium hexafluorophosphate, and some polymer batteries use gel-like electrolyte; (5) Batteries The shell is mainly divided into hard shell (steel shell, aluminum shell, nickel-plated iron shell, etc.) and soft shell (aluminum plastic film). When the battery is charged, lithium ions are separated from the positive electrode and inserted into the negative electrode, and vice versa. This involves inserting the electrode in lithium before assembly. Generally, a transition metal oxide with a potential greater than 3V and stable in the air is selected as the positive electrode, such as LiCoO2, LiNiO2, LiMn2O4. -Material, the potential of lithium compounds can be embedded as close as possible to the potential of lithium, such as various carbon materials including natural graphite, graphite composition, carbon fiber, central stage particulate carbon and metal oxides, including SnO, SnO2, tin composite oxide SnBxPyOz ( xu003d0.4~0.6, yu003d0.6~0.4, zu003dx+5y(2+3)/2). LiPF6 ethylene carbonate (EC), propylene carbonate (PC) and low-viscosity diethyl carbonate (DEC) are used as electrolytes. Polyene microporous membranes, such as polyethylene, polypropylene or composite membranes thereof, are used for separators. In particular, the PP/PE/PP three-layer separator not only has a low melting point, but also has high wear resistance and has a thermal safety effect. The shell is made of steel or aluminum, and the shell assembly has an explosion-proof power-off function. 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 lithium iron phosphate batteries and ternary lithium batteries