Why choose lithium iron phosphate for lithium batteries

by:CTECHi     2021-07-19

Lithium batteries are divided into three main categories from the cathode material: lithium manganate, lithium iron phosphate and ternary materials. In determining the maximum capacity of lithium batteries and other performance, the most important thing is the choice of cathode material. Lithium iron phosphate occupies 'half of the world' in the lithium battery industry. Next, let's briefly analyze the advantages and disadvantages of lithium iron phosphate!

Advantages of lithium iron phosphate battery

1. Higher safety

Lithium iron phosphate has good safety performance. According to the investigation, in the actual operation of acupuncture or short circuit experiments, it was found that a small part of the samples burned, 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. There was an explosion. In fact, after the overcharge reaction of lithium iron phosphate, its safety has been greatly improved compared with other lithium batteries.

2. Long cycle life

We all know that the so-called long-life lead-acid battery has a cycle life only It can reach about 300 times, up to 500 times. The lithium iron phosphate battery has a cycle life of more than 2000 times. The lifespan of lead-acid batteries of the same quality is generally about 2-3 years, while the theoretical life of lithium iron phosphate batteries will reach 7 to 8 years when used under the same conditions.

3. Large capacity without memory effect

The battery works under the condition of being fully charged and not discharged. The capacity Will quickly fall below the rated capacity value, this phenomenon is called the memory effect. Like nickel-metal hydride, nickel-cadmium batteries, there is memory, but lithium iron phosphate batteries do not have this phenomenon, and the battery capacity will not decrease. No matter what state the battery is in, it can be charged and used at any time without having to discharge it before charging. The volume of the lithium iron phosphate battery of the same specification and capacity is 2/3 of the volume of the lead-acid battery, and the weight is 1/3 of the lead-acid battery.

4. Green and environmental protection

Lithium iron phosphate battery is generally considered to be free of any heavy metals and rare metals, non-toxic , No pollution. The reason why lithium batteries are favored by the industry is mainly due to environmental considerations. As an important branch of lithium batteries, lithium iron phosphate is self-evident for its environmental performance.

5. Good high temperature performance

It is understood that the peak of lithium iron phosphate electric heating can reach 350℃-500℃, and The thermal peak of some lithium batteries is only around 200°C. Therefore, lithium iron phosphate occupies a certain advantage in high temperature performance!

It is inevitable that lithium iron phosphate battery has its own shortcomings: its low temperature performance is poor, and the preparation cost of lithium iron phosphate material is relatively compared with the manufacturing cost of the battery high.

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