Introduction to the working principle of lithium iron phosphate battery

　　When the LiFeP04 battery is being charged, the lithium ion Li+ in the positive electrode migrates toward the negative electrode through the polymer separator; during the discharge, the lithium ion Li+ in the negative electrode migrates toward the positive electrode through the separator. Lithium-ion batteries are named for the migration of lithium ions back and forth during charge and discharge.
　　1. When the battery is charging
　　Li+ migrates from the 010 plane of the lithium iron phosphate crystal to the surface of the crystal. Under the action of the electric field force, it enters the electrolyte, passes through the separator, and then migrates to the surface of the graphite crystal through the electrolyte, and then is embedded in the graphite lattice. At the same time, the electrons flow through the conductor to the aluminum foil collector of the positive electrode, and flow through the copper foil of the negative electrode through the ear, the battery pole, the external circuit, the negative pole, and the negative electrode, and then flow to the graphite negative through the electric conductor. The charge of the negative electrode reaches equilibrium. After lithium ions are deintercalated from lithium iron phosphate, lithium iron phosphate is converted into iron phosphate, and its lattice structure changes as shown in Figure-2 above.
　　2. When the battery is discharged
　　Li+ is deintercalated from the graphite crystal, enters the electrolyte, passes through the membrane, and then migrates to the surface of the lithium iron phosphate crystal through the electrolyte, and then re-inserted into the crystal lattice of lithium iron phosphate via the 010 plane. At the same time, the battery flows through the conductor to the copper foil collector of the negative electrode, and flows through the ear, the battery negative column, the external circuit, the positive pole, and the positive electrode to the aluminum foil current collector of the battery positive electrode, and then flows to the iron phosphate through the electric conductor. The lithium positive electrode makes the charge of the positive electrode reach equilibrium.
　　From 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 the migration speed of electrons should be balanced. This requires that the positive and negative electrodes of the lithium ion battery must be a mixed conductor of ions and electrons, and the ion conductivity and electronic conductivity must be the same. However, it is well known that lithium iron phosphate has poor electrical conductivity. While the conductivity of the graphite negative electrode is better, in order to achieve large-rate discharge, it is still necessary to improve the conductivity of the negative electrode, so that the electronic conductivity of the negative electrode and the ability of lithium ions to be deintercalated from the graphite are balanced.
　　Structural characteristics of lithium iron phosphate battery
　　Positive electrode
　　Lifepo4 of the olivine structure acts as the positive electrode of the battery; it is connected to the positive electrode of the battery by aluminum foil.
　　2. Negative electrode
　　A battery negative electrode is composed of carbon (graphite graphite); a copper foil (copperfoil) is connected to the negative electrode of the battery.
　　3. Diaphragm
　　It is a polymer material.
　　4. Electrolyte (electrolyte)
　　Such as lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate and the like.
　　5. Electrolyte
　　Including: ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl butyrate, fluoroethylene carbonate, lithium bis(oxalate) borate, lithium hexafluorophosphate.
　　6. There are also insulation materials, safety valves, seals, housings, etc.