The positive electrode of lithium-ion batteries is lithium iron phosphate material, which has great advantages in safety performance and cycle life. These are one of the most important technical indicators of power battery. Lifepo4 battery with 1C charging and discharging cycle life can be achieved 2000 times, the puncture does not explode, it is not easy to burn and explode when overcharged. Lithium iron phosphate cathode materials make large-capacity lithium-ion batteries easier to use in series.
Lithium iron phosphate as cathode material
Lifepo4 battery refers to a lithium-ion battery using lithium iron phosphate as a positive electrode material. The positive electrode materials of lithium-ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, and the like. Among them, lithium cobaltate is the positive electrode material used in most lithium-ion batteries. In principle, lithium iron phosphate is also an embedding and deintercalation process. This principle is identical to lithium cobaltate and lithium manganate.
lifepo4 battery advantages
1. High charging and discharging efficiency
Lifepo4 battery is a lithium-ion secondary battery. One main purpose is for power batteries. It has great advantages over NI-MH and Ni-Cd batteries. Lifepo4 battery has high charge and discharges efficiency, and the charge and discharge efficiency can reach over 90% under the condition of discharge, while the lead-acid battery is about 80%.
2. Lifepo4 battery high safety performance
The P-O bond in the lithium iron phosphate crystal is stable and difficult to decompose, and does not collapse or heat like a lithium cobaltate or form a strong oxidizing substance even at a high temperature or overcharge, and thus has good safety.
It has been reported that in the actual operation, a small part of the sample was found to have a burning phenomenon in the acupuncture or short-circuit test, but there was no explosion event. In the overcharge experiment, a high-voltage charge that was several times higher than the self-discharge voltage was used, and it was found that there was still an Explosion phenomenon. Nevertheless, its overcharge safety has been greatly improved compared to the ordinary liquid electrolyte lithium cobalt oxide battery.
3. Lifepo4 battery long cycle life
Lifepo4 battery refers to a lithium-ion battery using lithium iron phosphate as a positive electrode material.
The long-life lead-acid battery has a cycle life of about 300 times, and the highest is 500 times. The lithium iron phosphate power battery has a cycle life of more than 2000 times, and the standard charge (5-hour rate) can be used up to 2000 times.
The same quality lead-acid battery is “new half-year, old half-year, maintenance and maintenance for half a year”, up to 1~1.5 years, and the lifepo4 battery is used under the same conditions, the theoretical life will reach 7~8 years.
Considering comprehensively, the performance price ratio is theoretically more than four times that of lead-acid batteries. High-current discharge can be quickly charged and discharged with high current 2C. Under the special charger, the battery can be fully charged within 1.5 minutes of 1.5C charging, and the starting current can reach 2C, but the lead-acid battery has no such performance.
4. Good temperature performance
The peak temperature of lithium iron phosphate can reach 350 ° C -500 ° C while lithium manganate and lithium cobaltate are only around 200 ° C. Wide operating temperature range (-20C–+75C), with high-temperature resistance, lithium iron phosphate electric heating peak can reach 350 °C-500 °C, while lithium manganate and lithium cobalt oxide only at 200 °C.
5. Lifepo4 battery High capacity
It has a larger capacity than ordinary batteries (lead-acid, etc.). The monomer capacity is 5AH-1000AH.
6. No memory effect
Rechargeable batteries work under conditions that are often not fully discharged, and the capacity will quickly fall below the rated capacity. This phenomenon is called the memory effect. Memory like nickel-metal hydride and nickel-cadmium batteries, but the lifepo4 battery does not have this phenomenon, no matter what state the battery is in, it can be used with the charge, no need to discharge and recharge.
7. Lightweight of lifepo4 battery
The lifepo4 battery of the same specification capacity is 2/3 of the volume of the lead-acid battery, and the weight is 1/3 of the lead-acid battery.
8. Lifepo4 batteries are environmentally friendly
The battery is generally considered to be free of any heavy metals and rare metals (Ni-MH batteries require rare metals), non-toxic (SGS certified), non-polluting, in line with European RoHS regulations, is an absolute green battery certificate.
Therefore, the reason why lithium batteries are favored by the industry is mainly environmental considerations. Therefore, the battery has been included in the “863” national high-tech development plan during the “Tenth Five-Year Plan” period and has become national key support and encouragement development project.
With China’s accession to the WTO, the export volume of electric bicycles in China will increase rapidly, and electric bicycles entering Europe and the United States have been required to be equipped with non-polluting batteries.
The performance of the lithium-ion battery depends mainly on the positive and negative materials. Lithium iron phosphate is a lithium battery material that has only appeared in recent years. Its safety performance and cycle life are incomparable to other materials. The most important technical indicators of the battery.
Lifepo4 battery has the advantages of non-toxic, non-polluting, good safety performance, a wide range of raw materials, low prices, and long life. It is an ideal cathode material for a new generation of lithium-ion batteries.