-Analysis of structure and working principle of lithium iron phosphate battery

Analysis of structure and working principle of lithium iron phosphate battery
author:enerbyte source:本站 click503 Release date: 2023-02-15 10:17:15
abstract:
Lithium iron phosphate battery Lithium iron phosphate battery refers to lithium ion battery with lithium iron phosphate as cathode material. The cathode materials of lithium ion batteries mainly include lithium cobalt, lithium manganese, lithium nickel, ternary materials, li...

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Lithium iron phosphate battery

Lithium iron phosphate battery refers to lithium ion battery with lithium iron phosphate as cathode material. The cathode materials of lithium ion batteries mainly include lithium cobalt, lithium manganese, lithium nickel, ternary materials, lithium iron phosphate, etc. Lithium cobaltate is the cathode material used by most lithium-ion batteries at present.

As a rechargeable battery, the requirements are: high capacity, high output voltage, good charge-discharge cycle performance, stable output voltage, large current charge-discharge, electrochemical stability, safety in use, wide working temperature range, non-toxic or less toxic, and no pollution to the environment. The lithium iron phosphate battery with LiFePO4 as the positive electrode is good in these performance requirements, especially in terms of high discharge rate, stable discharge voltage, safety, service life and no pollution to the environment. It is the best and the best lithium ion battery with high current output at present.

Structure and working principle of lithium iron phosphate battery

LiFePO4 is used as the positive pole of the battery, which is connected by aluminum foil and the positive pole of the battery. In the middle is a polymer diaphragm, which separates the positive pole from the negative pole. However, lithium ion Li can pass through and electronic e - cannot pass through. On the right is the negative pole of the battery composed of carbon (graphite), which is connected by copper foil and the negative pole of the battery. The electrolyte of the battery is between the upper and lower ends of the battery, and the battery is sealed by a metal shell.

When the LiFePO4 battery is charged, the lithium ion Li in the positive electrode migrates to the negative electrode through the polymer membrane; During the discharge process, lithium ion Li in the negative electrode migrates to the positive electrode through the diaphragm. Lithium-ion battery is named after the migration of lithium ions during charging and discharging.

It should be noted here that there are some differences in various performance parameters of lithium iron phosphate batteries processed by different factories; In addition, some battery performances are not included, such as battery internal resistance, self-discharge rate, charge and discharge temperature, etc.

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