How to solve the conductivity problem of the positive and negative electrodes of lithium iron phosphate batteries?

Lithium iron phosphate battery 1. Lithium ions migrate from the 010 side of the lithium iron phosphate crystal to the crystal surface during charging. Under the use of electric field force, it enters the electrolyte, passes through the diaphragm, and then migrates to the surface of the graphite crystal through the electrolyte, and then inserts into the graphite crystal lattice. At the same time, electrons flow through the positive electrode of the aluminum foil collector of the conductor, through the tab, battery pole, external circuit, negative pole, and negative pole of the copper foil collector, and then through the graphite negative conductor, so the negative electrode charge balances. After the lithium ions are separated from the lithium iron phosphate, the lithium iron phosphate is transformed into iron phosphate, and the lattice structure change is shown in Figure-2. 2. When the battery is discharged, lithium ions are extruded from the graphite crystal, enter the electrolyte through the membrane, and then transfer to the surface of the lithium iron phosphate crystal through the electrolyte, and then insert into the lithium iron phosphate lattice through 010. At the same time, the battery flows through the negative electrode of the copper foil collector of the conductor, through the ear of the electrode, the negative pole of the battery, the external circuit, the positive pole and the positive pole of the ear of the anode aluminum foil collector, and then the positive electrode of the lithium iron phosphate through the conductor, So the positive charge reaches a balance. According to the working principle of lithium iron phosphate battery, the charging and discharging process of lithium iron phosphate battery requires the participation of lithium ions and electrons, and the migration speed of lithium ions and electrons must reach a balance. This requires that the positive and negative electrodes of lithium-ion batteries must be a mixed conductor of ions and electrons, and the ionic conductivity must be the same as the electronic conductivity. However, the conductivity of lithium iron phosphate is very poor. Although the conductivity of the graphite anode is better, it still needs to improve the conductivity of the anode to achieve a large-rate discharge, so that the electronic conductivity and the ability of lithium ions not to be inserted from the graphite are balanced. In order to solve the problem of positive electrode conductivity and negative electrode conductivity of lithium iron phosphate batteries, 1. It is necessary to add conductive agents on the positive and negative electrodes of the battery to make the active material of the battery form an effective conductive network, as shown in the model shown in Figure 3 and the electron micrograph shown in Figure 4. 2. Suppose the ion conductivity of the battery is I and the electron conductivity is E, then theoretically Iu003dE; 3. In order to ensure the dynamic balance of charge during the charging and discharging of the battery: I positive electrode u003d I electrolyte u003d I diaphragm u003d I electrolyte u003d I negative electrode; E positive electrodeu003dE positive electrode collection solutionu003dE positive pole columnu003dE external circuitu003dE negative electrode collection solutionu003dE negative electrode. These three equations (in fact, the important principle is the design of lithium-ion power lithium batteries, but in the actual design process and actual production process, how to realize the above three equations, but also design a series of experiments to verify and establish Mathematical models or relevant empirical formulas, and then used models or formulas for the design of lithium-ion batteries) lithium-ion batteries, polymer lithium-ion batteries, 18650 lithium-ion batteries, 24V lithium-ion batteries, high- and low-temperature lithium-ion batteries, lithium-ion batteries Manufacturers, lithium iron phosphate lithium ion batteries, 12V lithium ion batteries, medical equipment lithium ion batteries, industrial energy storage lithium ion batteries Statement: Some pictures and content of articles published on this site are from the Internet, if there is any infringement, please contact to delete the previous one : How to effectively prevent lithium-ion batteries from exploding?