Analyze the characteristics and important parameters of lithium batteries

How do lithium batteries work? Portable electronic devices are powered by batteries. With the rapid development of portable products, the use of various batteries, and the development of many new types of batteries. In addition to the familiar high-performance alkaline batteries, rechargeable nickel-cadmium batteries, and nickel-hydrogen batteries, there are also lithium batteries that have been developed in recent years. This article mainly analyzes the basic knowledge of lithium batteries. Including its characteristics, important parameters, meaning of the model, scope of application and precautions for the use of large-capacity lithium batteries. Energy density of various battery types Lithium is a metal element, and its chemical symbol is Li (lithium). In addition to applications in the nuclear energy industry, it can also manufacture special alloys, special glass (glass for TV screens) and lithium batteries. In lithium batteries, lithium is used as the anode of the battery. Lithium batteries are also divided into two categories: non-rechargeable batteries and rechargeable batteries. Non-rechargeable batteries are called disposable batteries. Chemical energy can only be converted into electrical energy at a time, and electrical energy cannot be reduced to chemical energy (or the reduction performance is very poor). Rechargeable batteries are called secondary batteries. It can convert electrical energy into chemical energy for storage. When used, the conversion of chemical energy into electrical energy is reversible, which is an important feature of electrochemical lithium batteries. The positive electrode of a lithium battery is usually composed of the active compound lithium, while the negative electrode is carbon with a special molecular structure. The important component of commonly used anode materials is LiCoO2. When charging, the potential on the electrode forces the anode compound to release lithium ions and insert them into the carbon. The anode molecules are arranged in a laminar flow structure. Lithium ions are separated from the layered structure of carbon during discharge and recombine with the positive electrode compound. The movement of lithium ions appears as a large-capacity lithium battery. Although the principle of chemical reaction is very simple, there are still many practical problems to be considered in actual industrial processing. The positive electrode material needs to add additives to maintain the repetitive charge activity, while the negative electrode material needs to be designed at the molecular structure level to accommodate more lithium ions. In addition to maintaining stability, the electrolyte between the positive and negative electrodes must also have good conductivity to reduce the internal resistance of the battery. Although lithium batteries rarely have the memory effect of nickel-cadmium batteries, the memory effect is based on crystallization, and there is almost no such reaction in lithium batteries. However, the capacity of a lithium battery will still decrease after multiple charges, and the reasons are complex and diverse. The important reason is the changes in the anode and cathode materials themselves. From a molecular level, the positive and negative hole structures containing lithium ions will gradually collapse and block. From a chemical point of view, it is the active passivation of anode and cathode materials, and side reactions occur to other stable compounds. There are also some practical situations where the anode material gradually falls off, ultimately reducing the number of lithium ions that can move freely during the charge and discharge process in the battery. 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 article: Summary of common problems in the use of lithium batteries