Lifepo4 Lithium Iron Phosphate Battery Packs which use lithium iron phosphate (LiFePO4) as the positive material and carbon as the negative material. The rated voltage of the single unit is 3.2V, and the charge cut-off voltage is 3.6V~3.65V. Lithium iron phosphate battery has the advantages of high working voltage, high energy density, long cycle life, good safety performance, low self-discharge rate and no memory effect.

When Lifepo4 Lithium Iron Phosphate Battery Packs on charging, the lithium ion Li in the positive electrode migrates to the negative electrode through the polymer separator; During the discharge process, the lithium ion Li in the negative electrode migrates to the positive electrode through the separator. Lithium-ion batteries are named by lithium ions move back and forth during charging and discharging.

When Lifepo4 Lithium Iron Phosphate Battery Packs is charged, Li migrates from the 010 face 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 diaphragm, and then migrates to the surface of the graphite crystal through the electrolyte, and then is embedded in the graphite crystal lattice. . At the same time, electrons flow to the aluminum foil collector of the positive electrode through the conductor, flow to the copper foil collector of the negative electrode through the tab, battery pole, external circuit, negative pole, and negative lug, and then flow to the graphite negative electrode through the conductor. The charge on the negative electrode is balanced. After the lithium ion is de-embedded from the lithium iron phosphate, the lithium iron phosphate is converted into iron phosphate.

When the battery is discharged, Li is released from the graphite crystal, enters the electrolyte, passes through the diaphragm, and then migrates to the surface of the lithium iron phosphate crystal through the electrolyte, and then re-embeds into the lithium iron phosphate crystal lattice through the 010 plane. At the same time, the battery flows to the copper foil collector of the negative electrode through the conductor, flows to the aluminum foil collector of the battery positive electrode through the tab, battery negative pole, external circuit, positive pole, and positive tab, and then flows to the iron phosphate through the conductor. Lithium positive electrode balances the charge of the positive electrode.

From the working principle of the lithium iron phosphate battery, it can be known that the charging and discharging process of the 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 must be balanced. This requires that the positive and negative electrodes of lithium-ion batteries must be a mixed conductor of ions and electrons, and their ionic conductivity and electronic conductivity must be consistent. However, the conductivity of lithium iron phosphate is very poor. Although the conductivity of the graphite negative electrode is better, it is still necessary to improve the conductivity of the negative electrode to achieve a high-rate discharge, so that its electronic conductivity and the ability of lithium ions to be deintercalated from the graphite are balanced.

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