What are the advantages and disadvantages of lithium-iron phosphate batteries

The advantages of lithium iron phosphate batteries are:

Lithium iron phosphate batteries have a long life and a cycle life of more than 2,000 times. Under the same conditions, lithium iron phosphate batteries can be used for 7 to 8 years.

Use safe. Lithium iron phosphate batteries undergo rigorous safety tests and do not explode even in traffic accidents.

Charge fast. Use a dedicated charger, 1.5 C charging 40 minutes can make the battery full.

Lithium iron phosphate batteries are resistant to high temperatures, and the thermal wind value of lithium iron phosphate batteries can reach 350 to 500 degrees Celsius.

Lithium iron phosphate batteries have a large capacity.

Lithium iron phosphate batteries have no memory effect.

Lithium iron phosphate batteries are green, non-toxic, non-polluting, and have a wide range of raw materials and cheap prices.

The disadvantages of lithium iron phosphate batteries are:

Lithium-iron phosphate batteries have a small vibration density and a density of about 0.8 to 1.3. Large size.

The electrical conductivity is poor, the diffusion speed of lithium ions is slow, and the actual specific capacity is low when the charge and discharge is high.

The low temperature performance of lithium iron phosphate battery is poor.

Lithium-iron phosphate cells have a long life span of about 2,000 times, but lithium iron phosphate batteries have a short life span of about 500 times.

LiFePO4 as a lithium-ion battery positive material has the advantages of cheap, non-toxic, good environmental compatibility, higher specific capacity(170mAh/g) and higher working voltage, long cycle life, high temperature performance and good safety performance.

The main problems are: low electron conductivity, poor performance of high-power discharge.

Main Advantages and Disadvantages of Lithium-ion Battery

advantage

Sealed batteries; No maintenance required

Long cycle life

Greater than 1,000 times(lithium iron phosphate battery cycle life greater than 2000 times, 1C charge and discharge 100 % DOD)

Wide operating temperature range

Charging at -20 ~ 60 °C, discharge at -40 ~ 65 °C(lithium iron phosphate battery has excellent high temperature performance and is very suitable for solar energy products. It requires the use of cylindrical 18650 or 26650 steel shells. Soft packaging is easy to excrete gas in a high temperature environment, resulting in a sudden drop in battery life.)

Long storage life

Low self-discharge rate: 2 ~ 8 % / month(annual self-discharge is about 15 %)

Fast charging capability(volumetric core can be charged at 1-2C charging current, which is much more efficient than 0.1-0 .2 C charging of lead-acid batteries, and has many benefits in power and energy storage applications)

High discharge rate and high power discharge capability(the battery has no significant decrease in discharge capacity under the double discharge of 1C-3C, compared to acid battery series and nickel battery)

High capacity and energy efficiency

High quality ratio and high volume ratio

About 159W · h/kg, about 400W · h/L

No memory effect

disadvantage

Moderate initial price

Decay at high temperatures

We need to protect the circuits.

When the discharge is below 2V, the battery performance will decay

Over discharge, there will be capacity loss or possible thermal runaway

Battery exhaust occurs when overcharging

When the battery hits and breaks, it will exhaust and may lose heat.

The general output power of cylindrical battery structure is lower than cadmium / nickel or metal hydride / nickel battery

If the lithium-ferric phosphate battery and the ternary lithium-ion battery are compared on power and energy storage and lighting. We take the cylindrical 26650 model as an example. The first is the ability to adapt to high and low temperatures. Lithium iron phosphate has excellent high temperature performance, especially in summer outdoor adaptation. At low latitudes, the temperature at noon will be relatively high. If used outdoors, there is no doubt that lithium iron batteries dominate; However, few products can be eaten at high and low temperatures. The low-temperature performance of iron lithium batteries needs to be improved. The low-temperature performance of three-way lithium ion batteries is much better than that of iron lithium batteries. Look at the drawings.

Then look at the cycle life of the battery, with Hite's iron lithium 26650 model 3200mAh core and ternary 26650 model 4500mAh core under laboratory conditions, 1C charge and discharge, 100 % DOD, iron lithium battery life > 2000 times, 3-yuan battery > 1000 times. Of course, if the battery is 80 % DOD, 60 % DOD, and 40 % DOD, the life span will increase exponentially. See attached figure.

Other features, such as security, stability, price, combination, and ease of acquisition, all require consultation with specialized manufacturers who will provide appropriate advice. Thank you.

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