Introduce the basic composition and key materials of lithium-ion batteries

The basic component and key material of lithium-ion batteries Li-ion batteries are a kind of chemical power source. We understand that the chemical power supply must meet the following conditions in the energy conversion process. The oxidation-reduction reaction of the two electrodes that make up the battery must be carried out in two different areas, which is different from the general oxidation-reduction reaction. In the oxidation-reduction reaction of the active materials of the two electrodes, the required electrons must be transferred through the external circuit, which is different from the microcellular reaction in the corrosion process. In order to meet the above conditions, no matter what series, shape, and size of the battery, it is composed of the following components: electrode (active material), electrolyte, membrane, binder, and casing; in addition, lithium ion batteries have positive and negative leads, Indispensable parts such as center terminal, insulating material, safety valve, PTC (positive temperature control terminal), etc. The following briefly introduces the important components of lithium-ion batteries, namely electrode materials, electrolytes, membranes and binders. That is, the electrode material electrode is the core of the battery, composed of active material and conductive skeleton. The positive and negative active materials are the source of electrical energy and an important part of determining the basic characteristics of the battery. For example, in lithium-ion batteries, the current cathode active material of commercial lithium-ion batteries is generally LiCoO2. At present, the focus of scientific research is to develop non-cobalt materials, and some cathode materials on the market also use LiMn2O4. The non-electrostatic force inside the source is the work done to move a unit of positive charge from the negative pole of the source to the positive pole through the internal circuit. The unit of electromotive force is volts. A power source is a device that converts other forms of energy into electrical energy. To maintain a constant current in the circuit, electrostatic force alone is not enough. The power supply supplies non-electrostatic force, which transfers the positive charge from a low potential to a high potential. The process by which non-electrostatic forces push charges to do work is the process by which other forms of energy are converted into electrical energy. The electromotive force is a physical quantity that represents the electrical energy appearing in the power source. Different power sources have different non-static power sources and different forms of energy conversion. For example, the non-electrostatic force of chemical electromotive force (dry cell, button battery, battery, lithium ion battery, etc.) is a chemical purpose, and its size has nothing to do with the size of the electromotive force and power supply; the non-electrostatic force of the generator is the use of magnetic field to move charge force. The non-electrostatic force of photoelectromotive force (photocell) comes from the internal photoelectric effect. The piezoelectric electromotive force (piezoelectric igniter, crystal microphone, etc.) comes from the polarization phenomenon caused by mechanical use. When the power supply of the external circuit is disconnected, the non-electrostatic power inside the power supply is balanced with the electrostatic field force, and the electromotive force of the positive and negative bipolar power supply is equal to the power supply. When the external circuit is turned on, the terminal voltage is less than the electromotive force. 7. Low dose, low price. Statement: 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: How to optimize the lithium-ion battery charging system?