What is the structure and working principle of lithium battery?

Lithium battery structure Lithium battery has five major parts in structure: positive electrode, negative electrode, electrolyte, separator, casing and electrode lead. Currently, the more commonly used lithium battery materials are lithium cobalt oxide, lithium nickel oxide, and lithium manganate. The most used material is lithium cobalt oxide, which has good cycle performance and is convenient to manufacture. The disadvantage is that the cobalt compound is more expensive. Lithium nickelate is difficult to manufacture because of its unstable nature. Generally, it is the compound of lithium cobaltate doped with nickel, also known as lithium nickel cobaltate. Lithium manganate is also a very good material. There are many reasons why lithium manganate decays faster at high temperatures. At present, most of it is still used in the laboratory stage. The structure of lithium batteries is mainly divided into two categories: winding type and stacked type. Liquid lithium batteries use a winding structure, while polymer lithium batteries have two types. In the winding type, the positive electrode membrane, the separator, and the negative electrode membrane are placed in sequence and wound into a cylindrical or flat cylindrical shape, mainly represented by SANYO, TOSHIBA, SONY, and ATL. In the stacked type, the positive electrode, the separator, the negative electrode, the separator, and the positive electrode are stacked in multiple layers. Weld all the positive poles together and lead them out, and the negative poles are also welded together and lead out. ATL is the representative. The working principle of lithium battery 1. Lithium ions are extracted from the positive electrode crystal lattice under the driving of the electric field during charging, and are inserted into the negative electrode crystal lattice through the electrolyte. At the beginning of charging, the voltage of the battery to be charged should be tested first. If the voltage is lower than 3V, pre-charge should be carried out first. The charging current is 1/10 of the set current, generally about 0.05C. After the voltage rises to 3V, it enters the standard charging process. The standard charging process is: constant current charging with the set current, when the battery voltage rises to 4.20V, change to constant voltage charging, and keep the charging voltage at 4.20V. At this time, the charging current gradually decreases, and when the current drops to 1/10 of the set charging current, charging ends. Generally, the charging current of lithium batteries is set between 0.2C and 1C. The larger the current, the faster the charging and the greater the battery heat. Moreover, charging with an excessive current will result in insufficient capacity because the electrochemical reaction inside the battery takes time. It's the same as pouring beer. If you pour it too fast, foam will appear, but you will be dissatisfied. Term explanation: The charging and discharging current is generally referred to by C, which is the value corresponding to the battery capacity. The battery capacity is generally expressed in Ah and mAh. For example, the battery capacity of M8 is 1200mAh, and the corresponding C is 1200mA. 0.2C is equal to 240mA. This article introduces the working principle and use of lithium batteries. 2. When discharging, the process is just the opposite. Lithium ions return to the positive electrode, and the electrons pass from the external circuit to the positive electrode to recombine with lithium ions. It can be seen from the typical discharge curve that the larger the battery discharge current, the smaller the discharge capacity and the faster the voltage drop. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement.