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The principle of lithium iron phosphate battery

2022-01-10

The principle of lithium iron phosphate battery


  The full name of lithium iron phosphate battery is lithium iron phosphate lithium ion battery. It is a lithium ion battery that uses lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material. The rated voltage of the monomer is 3.2V, and the charge cut-off voltage is 3.6V~3.65V. It is currently the most environmentally friendly, the longest life, the highest safety, and the highest discharge rate among all lithium battery packs.


When a lithium iron phosphate battery is charged, 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 after lithium ions move back and forth during charging and discharging.




1. When the lithium iron phosphate battery is charged, Li+ migrates from the 010 face of the lithium iron phosphate crystal to the crystal surface. Under the action of the electric field force, it enters the electrolyte, passes through the diaphragm, and then migrates to the surface of the graphene through electrolysis, and then is embedded In the graphene lattice, at the same time, electrons flow to the aluminum foil electrode of the positive electrode through the conductor, and flow to the copper foil collector of the negative electrode through the tab, battery pole, external circuit, negative pole, and negative pole. Graphite negative electrode is the negative electrode's charge balance. After the lithium ion is deintercalated from the lithium iron phosphate, the lithium iron phosphate is converted into iron phosphate.


2. When the lithium iron phosphate battery is discharged, Li+ is deintercalated 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 through the 010 surface. Within the lattice. At the same time, the battery flows to the copper foil collector of the negative electrode through the conductor, flows to the copper foil collector of the positive electrode through the tab, battery negative pole, external circuit, positive pole, and positive lug, and then flows to the lithium iron phosphate positive electrode through the conductor. The charge of the positive electrode reaches an equilibrium state.


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