Analyze the structure and working principle of lithium batteries

The structure of the lithium battery The first five lithium batteries in the structure: positive electrode, negative electrode, electrolyte, barrier layer, shell and electrode lead. At present, lithium cobalt acid, lithium nickel acid and lithium manganese acid are commonly used in lithium batteries. The most commonly used material is lithium cobalt oxide, which has a good circulation function and is convenient to manufacture, but the disadvantage is that cobalt compounds are relatively expensive. Due to the unstable nature of lithium nickelate, it is difficult to prepare. It is usually used for lithium-cobalt-doped nickel compounds, also known as lithium nickel ore. Lithium manganate is also a good data. Lithium manganate decays faster at high temperatures and many other reasons, most of the current use is still in the laboratory stage. The structure of lithium battery is divided into winding type and cascade type. Liquid lithium batteries use a winding structure, while polymer lithium batteries have both. The positive diaphragm, the gap, and the negative diaphragm are placed in the winding type in sequence to form a cylinder or flat column, which is mainly represented by Sanyo, Toshiba, Sony, and ATL. Cascading is to superimpose the positive electrode, gap, negative electrode, gap, and positive electrode. All the positive electrodes are welded together and lead out, and the negative electrodes are also welded together and lead out. ATL is the most important representative. The working principle of lithium battery 1. When charging is driven by an electric field, lithium ions escape from the positive electrode lattice, pass through the electrolyte, and are embedded in the negative electrode lattice. At the beginning of charging, the voltage of the battery to be charged should be tested first. If the voltage is lower than 3V, the battery should be precharged first. The charging current is 1/10 of the set current, generally around 0.05c. After the voltage rises to 3V, it enters the standard charging process. The standard charging process is as follows: constant current charging, set current. When the battery voltage rises to 4.20v, it changes to constant voltage charging, and the charging voltage remains at 4.20v. At this time, the charging current gradually decreases. When the current drops to 1/10 of the set charging current, the charging ends. The charging current of lithium batteries is generally set between 0.2c and 1C. The higher the current, the faster the charging, and the greater the heating of the battery. In addition, excessive current charging will not have enough capacity because the electrochemical reaction inside the battery takes time. Just like pouring beer, pouring too quickly will cause foam, but you are dissatisfied. Terminology: The charge and discharge current is generally called C, which is the value corresponding to the battery capacity. The battery capacity is generally expressed in Ah and mAh. For example, the M8 battery capacity is 1200mAh, and the corresponding C is 1200mA. 0. 2c is equal to 240mA. 2. When discharging, the process is just the opposite. Lithium ions return to the positive electrode, and electrons reach the positive electrode through an external circuit and recombine with lithium ions. It can be seen from the typical discharge curve that the larger the 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. If there is any infringement, please contact to delete. Previous post: What are the types of lithium batteries?