CR2025 battery

　　What is the charging and discharging process of CR2025 battery? What are its technological processes?

　　working principle

　　Charging process

　　A power source charges the battery. At this time, the electrons e on the positive electrode run to the negative electrode through the external circuit. The positive lithium ions Li+ jump from the positive electrode into the electrolyte, crawl through the small winding hole in the separator, swim to the negative electrode, and meet the early The electrons that came over are combined together. now:

　　battery discharge process

　　Discharge includes constant current discharge and constant resistance discharge. Constant current discharge actually involves adding a variable resistor in the external circuit that changes with the voltage. The essence of constant resistance discharge is to add a resistor to the positive and negative terminals of the battery to allow electrons to pass through. It can be seen that as long as the electrons on the negative electrode cannot run from the negative electrode to the positive electrode, the battery will not discharge. Both electrons and Li+ move together, in the same direction but in different paths. During discharge, the electrons run from the negative electrode through the electronic conductor to the positive electrode. The lithium ions Li+ jump from the negative electrode into the electrolyte and crawl through the winding holes in the separator. It swims to the positive pole and combines with the electrons that have run over long ago.

　　Charge and discharge characteristics

　　The positive electrode of the battery cell uses LiCoO2, LiNiO2, and LiMn2O2. LiCoO2 is a crystalline form with a very stable layer structure. However, when x Li ions are removed from LiCoO2, its structure may change, but whether it changes depends on x big and small.

　　Through research, it is found that when x>0.5, the structure of Li1-xCoO2 is extremely unstable, and crystalline collapse will occur. The external manifestation is the collapse of the battery core. Therefore, during use of the battery core, the x value in Li1-xCoO2 should be controlled by limiting the charging voltage. Generally, if the charging voltage is not greater than 4.2V, then x is less than 0.5. At this time, the crystal form of Li1-xCoO2 is still stable.

　　Lithium battery formula and process flow

　　1. Positive and negative electrode formulas

　　1.1 Positive electrode formula: LiCoO2 + conductive agent + adhesive + current collector (aluminum foil)

　　LiCoO2(10μm):96.0%

　　Conductive agent (CarbonECP) 2.0%

　　Adhesive (PVDF761) 2.0%

　　The weight ratio of NMP (increased adhesion): solid material is approximately 810:1496

　　a) Positive electrode viscosity control 6000cps (temperature 25 rotor 3);

　　b) The NMP component must be adjusted appropriately to meet the viscosity requirements;

　　c) Pay special attention to the effects of temperature and humidity on viscosity

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