The Working Principle Of LiFePO4 Battery

The full name of LiFePO4 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 single unit is 3.2V, and the charge cut-off voltage is 3.6V~3.65V.

It is the most environmentally friendly, the longest lifespan, the safest and the highest discharge rate among all lithium battery packs.

The working principle of LiFePO4 battery

When the LiFePO4 battery is charged, the lithium ions Li+ in the positive electrode migrate to the negative electrode through the polymer separator; during the discharge process, the lithium ions Li+ in the negative electrode migrate to the positive electrode through the separator. Lithium-ion batteries are named after lithium ions migrate back and forth during charging and discharging.

• When the LiFePO4 battery is charged, Li+ migrates from the 010 surface 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 separator, migrates to the surface of graphene through electrolysis, and then embeds 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 current collector of the negative electrode through the tab, battery pole, external circuit, negative pole, and negative ear. Then through the conductor to the graphite negative electrode, the charge of the negative electrode is balanced, and after the lithium ions are deintercalated from the lithium iron phosphate, the lithium iron phosphate is converted into iron phosphate.
• When the LiFePO4 batteryis discharged, Li+ is deintercalated from the graphite crystal, enters the electrolyte, and passes through the separator. Then it migrates to the surface of the lithium iron phosphate crystal through the electrolyte, and then re-embeds into the lattice of lithium iron phosphate through the 010 surface. At the same time, the battery flows to the copper foil collector of the negative electrode through the conductor, and flows to the copper foil current collector of the positive electrode through the tab, the negative pole of the battery, the external circuit, the positive pole and the positive ear. Then through the conductor to the positive electrode of lithium iron phosphate, the charge of the positive electrode reaches a balanced state.