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Introduction to the working principle of lithium iron phosphate batteries

2023/3/10     Viewed:    

Lithium iron phosphate battery refers to a lithium-ion battery that uses lithium iron phosphate as the positive electrode material. The cathode materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary materials, lithium iron phosphate, etc.
During charging of lithium iron phosphate batteries, the lithium ion Li+in the positive electrode migrates to the negative electrode through a polymer separator; During the discharge process, the lithium ion Li+in the negative electrode migrates to the positive electrode through a separator. Lithium ion batteries are named after the migration of lithium ions during charging and discharging.
When charging a lithium iron phosphate battery, Li+migrates from the 010 surface of the lithium iron phosphate crystal to the surface of the crystal. Under the use of electric field force, it enters the electrolyte, passes through the diaphragm, and then electrolytically migrates to the surface of graphene. It is then embedded in the graphene lattice. At the same time, electrons flow through the conductor to the aluminum foil electrode of the positive electrode, and through the electrode ear, battery pole, external circuit, negative pole, and negative ear to the copper foil collector of the negative electrode, After passing through the conductive material to the graphite negative electrode, the charge of the negative electrode reaches equilibrium. After lithium ions are removed from lithium iron phosphate, lithium iron phosphate is converted into iron phosphate.
When a lithium iron phosphate battery is discharged, Li+is detached from the graphite crystal, enters the electrolyte, passes through the separator, migrates to the surface of the lithium iron phosphate crystal through the electrolyte, and then re embedded into the lattice of the lithium iron phosphate crystal through the 010 surface. At the same time, the battery flows through the conductive body to the copper foil collector of the negative electrode, through the electrode ear, battery negative pole, external circuit, positive pole, and positive pole ear to the copper foil collector of the positive electrode, and then through the conductive body to the lithium iron phosphate positive electrode, so that the charge of the positive electrode reaches an equilibrium state.

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