What Are The Advantages of Lithium Iron Phosphate Batteries? Introduction To The Seven Major Advantages of Lithium Iron Phosphate Batteries

Lithium iron phosphate battery refers to a lithium-ion battery using lithium iron phosphate as the positive electrode material. The cathode materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium manganate, lithium nickel oxide, ternary materials, lithium iron phosphate, etc. Among them, lithium cobalt oxide is the cathode material currently used in most lithium-ion batteries. In terms of material principles, lithium iron phosphate is also an intercalation and deintercalation process. This principle is exactly the same as that of lithium cobalt oxide and lithium manganate.

Lithium iron phosphate batteries are lithium-ion secondary batteries. One of their main uses is for power batteries. They have great advantages over NI-MH and Ni-Cd batteries. The charge and discharge efficiency of lithium iron phosphate batteries is high, and the charge and discharge efficiency can reach more than 90% under rate discharge conditions, while lead-acid batteries are about 80%. The following is a brief introduction to the seven major advantages of lithium iron phosphate batteries.

1. Improvement of safety performance

The P-O bond in the lithium iron phosphate crystal is stable and difficult to decompose. Even at high temperatures or overcharge, it will not collapse and generate heat or form strong oxidizing substances like lithium cobalt oxide, so it has good safety. Some reports pointed out that in actual operations, a small number of samples were found to be burning during acupuncture or short-circuit experiments, but no explosion occurred. In overcharge experiments, high-voltage charging that was many times higher than the discharge voltage was used, and it was found that there were still explosion phenomenon. Even so, its overcharge safety has been greatly improved compared to ordinary liquid electrolyte lithium cobalt oxide batteries.

2. Improvement of life span

Lithium iron phosphate battery refers to a lithium-ion battery using lithium iron phosphate as the positive electrode material.

The cycle life of long-life lead-acid batteries is about 300 times, and the maximum is 500 times, while the cycle life of lithium iron phosphate power batteries reaches more than 2,000 times, and can reach 2,000 times with standard charging (5 hours rate). Lead-acid batteries of the same quality last "half a year for new ones, half a year for old ones, and another half year for maintenance", which is 1 to 1.5 years at most. However, when used under the same conditions, the theoretical life of lithium iron phosphate batteries will reach 7 to 8 years. Comprehensive consideration, the performance-price ratio is theoretically more than 4 times that of lead-acid batteries. High-current discharge can quickly charge and discharge at a high current of 2C. Under a special charger, the battery can be fully charged within 40 minutes at 1.5C, and the starting current can reach 2C. Lead-acid batteries do not have this performance.

3. Good high temperature performance

The electric heating peak of lithium iron phosphate can reach 350℃-500℃, while the peak value of lithium manganate and lithium cobalt oxide is only about 200℃. The operating temperature range is wide (-20C--+75C), and the lithium iron phosphate electric heating peak value can reach 350℃-500℃, while the lithium manganate and lithium cobalt oxide are only around 200℃.

4. Large capacity

Has a larger capacity than ordinary batteries (lead-acid, etc.). The monomer capacity is 5AH-1000AH.

5. No memory effect

When a rechargeable battery is constantly working under the condition of being fully charged and not fully discharged, the capacity will quickly fall below the rated capacity value. This phenomenon is called the memory effect. Nickel metal hydride and nickel cadmium batteries have memory, but lithium iron phosphate batteries do not have this phenomenon. No matter what state the battery is in, it can be charged and used at any time, and there is no need to discharge it first and then charge it.

6. Light weight

The volume of a lithium iron phosphate battery with the same specification and capacity is 2/3 that of a lead-acid battery, and its weight is 1/3 that of a lead-acid battery.

7. Environmental protection

Lithium iron phosphate batteries are generally considered to be free of any heavy metals and rare metals (nickel metal hydride batteries require rare metals), non-toxic (SGS certified), non-polluting, compliant with European RoHS regulations, and an absolute green battery certificate. Therefore, the reason why lithium batteries are favored by the industry is mainly due to environmental protection 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 a key national support and encouragement development project.

Of course, lithium iron phosphate batteries also have shortcomings, such as poor low-temperature performance, low tap density of the cathode material, and the volume of lithium iron phosphate batteries of the same capacity is larger than that of lithium-ion batteries such as lithium cobalt oxide, so they do not have advantages in micro batteries. When used in power batteries, lithium iron phosphate batteries, like other batteries, need to face battery consistency issues.