Ternary lithium battery - iron phosphate

NegotiableUpdate on 05/14

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Overview

Ternary lithium battery - iron phosphate 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 a single cell is 3.2V, and the charging cut-off voltage is 3.6V~3.65V.

Product Details

Ternary lithium battery - iron phosphate
Lithium iron phosphate battery 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 a single cell is 3.2V, and the charging cut-off voltage is 3.6V~3.65V.
During the charging process, some lithium ions in lithium iron phosphate are released and transferred to the negative electrode through the electrolyte, where they are embedded in the negative electrode carbon material; At the same time, electrons are released from the positive electrode to reach the negative electrode from the external circuit, maintaining the balance of the chemical reaction. During the discharge process, lithium ions are released from the cathode and reach the positive electrode through the electrolyte. At the same time, electrons are released from the negative electrode and reach the positive electrode from the external circuit, providing energy to the outside world. [1]
Lithium iron phosphate batteries have the advantages of high operating voltage, high energy density, long cycle life, good safety performance, low self discharge rate, and no memory effect

Ternary lithium battery - iron phosphate

Characteristics of battery structure

On the left side of the lithium iron phosphate battery is a positive electrode made of LiFePO4 material with an olivine structure, which is connected to the battery positive electrode by aluminum foil. On the right is the negative electrode of the battery made of carbon (graphite), connected to the negative electrode of the battery by copper foil. In the middle is a polymer separator, which separates the positive and negative electrodes. Lithium ions can pass through the separator while electrons cannot. The battery is internally charged with electrolyte and sealed with a metal casing

Principle of battery charging and discharging

The charging and discharging reactions of lithium iron phosphate batteries occur in LiFePO4And FePO4Between the two phases. During the charging process, LiFePO4Gradually detach from lithium ions to form FePO4During the discharge process, lithium ions embed into FePO4Forming LiFePO4.[2]

When charging a battery, lithium ions migrate from the lithium iron phosphate crystal to the crystal surface, enter the electrolyte under the action of electric field force, pass through the separator, migrate to the surface of the graphite crystal through the electrolyte, and then embed into the graphite lattice.[2]

At the same time, electrons flow through the conductive material to the aluminum foil collector of the positive electrode, through the electrode ear, battery positive pole, external circuit, negative electrode pole, and negative electrode ear to the copper foil collector of the negative electrode of the battery, and then through the conductive material to the graphite negative electrode, so that 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.[2]

When the battery is discharged, lithium ions are deintercalated from the graphite crystal, enter the electrolyte, then pass through the separator, migrate to the surface of the lithium iron phosphate crystal through the electrolyte, and then re intercalate into the lattice of lithium iron phosphate.[2]

At the same time, electrons flow through the conductive material to the copper foil collector of the negative electrode, through the electrode ear, the negative electrode column of the battery, the external circuit, the positive electrode column, and the positive electrode ear to the aluminum foil current collector of the positive electrode of the battery, and then through the conductive material to the lithium iron phosphate positive electrode, so that the charge of the positive electrode reaches equilibrium. After lithium ions are embedded into iron phosphate crystals, iron phosphate is converted into lithium iron phosphate.[