Difference between lithium-iron phosphate and ternary lithium

Difference between lithium-iron phosphate and ternary lithium

Lithium battery and lithium-iron phosphate battery have their own advantages

Lithium-iron phosphate monomer typical voltage 3.2V, lithium ion 3.7V

Lithium-iron phosphate is resistant to overcharge and over discharge, and can be restored to more than 80% in a short time. Irreversible damage occurs when lithium ions over-discharged to 2.6V.

Lithium-iron phosphate does not catch fire when it overcharged to 100%. When the lithium ion exceeds 4.35V, the gassing will swell.

Lithium-iron phosphate puncture does not fire and does not explode. Lithium ions will. (Now it is relatively safe)

Lithium-iron phosphate is resistant to high temperatures and can used after more than 200 degrees of recovery. Lithium ions are not working.

Lithium-iron phosphate can discharge at a large current, can be above 10C20C, lithium ion can only discharge 3~5C

In the above, lithium-iron phosphate is the safest among lithium batteries.

However, the energy density of lithium-iron phosphate is not as great as that of lithium ion batteries. The voltage is also relatively low. Due to its large discharge characteristics, it mainly uses power sources such as electric vehicles and aircraft models. The lithium ion capacity is large, and it mainly used in the field of civilian consumption. So look at the different batteries you choose to use.

After 30 years of development, lithium-ion batteries have improved in terms of specific energy and specific power, and have successfully applied to automobiles. Limited by the specific energy of the battery, the limited range of pure electric vehicles is a bottleneck restricting development. The foreign automobile factory plans to develop hybrid vehicles in the near future. At present, the positive electrode materials used in lithium ion batteries mainly include lithium manganite, lithium-iron phosphate, lithium cobalt oxide, ternary materials and the like. Currently, the positive electrode of the power battery mainly uses lithium-iron phosphate and ternary materials.

The discharge comparison of different temperature batteries shown in Figure 4. Discharge at 55 ° C, ternary material battery and lithium-iron phosphate at room temperature, there is no difference in discharge capacity, discharge at -20 ° C, ternary material-battery discharge capacity / room temperature capacity ratio is higher than lithium-iron phosphate battery 15 %, as shown in Table 3.

In this paper, by making batteries of the same structure, the advantages and disadvantages of ternary materials and lithium-iron phosphate materials in HEV battery obtained. The ternary materials have advantages in battery specific energy, specific power, large rate charging, low temperature performance, etc. The lithium-iron phosphate material has obvious advantages, and the lithium-iron phosphate battery is superior to the ternary material in terms of safety. When selecting the battery, it can selected according to different purposes. For example, the bus has a large space, and the battery has relatively low specific energy and specific power. The lithium-iron phosphate battery can selected to exert its good cycle performance, and the space of the car is limited. If the dosage is small, it is more suitable to use a high specific energy and a high specific power ternary material battery.

At present, the energy density of lithium-iron phosphate battery has reached the theoretical limit, and the energy density of the ternary battery has much room for improvement. Comprehensive performance density, power density, cycle life, low temperature performance, etc., the overall performance of the ternary battery is better than lithium-iron phosphate battery.

1. Lithium-iron phosphate 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.

2. Ternary polymer lithium battery: refers to the lithium battery of lithium nickel cobalt manganese ternary positive electrode material for the positive electrode material. There are many kinds of positive electrode materials for lithium ion battery, mainly lithium cobaltate, lithium manganate, lithium nickelate, Ternary materials, lithium-iron phosphate, etc.

3. Reflect the difference in materials, uses and processes.

A battery is a device for energy conversion and storage that converts chemical or physical energy into electrical energy through a reaction.

A battery is a chemical power source consisting of two different compositions of electrochemically active electrodes that make up the positive and negative electrodes. The two electrodes immersed in an electrolyte that provides media conduction. When connected to an external carrier, it converted by internal chemical energy provides energy.

Lithium-iron phosphate battery and ternary battery material system is different, lithium-iron phosphate is 3.2V voltage platform, cycle life is more than 2000 times, ternary battery is 3.6V voltage platform, cycle life depends on manufacturers, different models and process, some 500 cycles, and some could more than 1000 cycles. The high temperature performance of iron lithium battery is good, and low temperature performance of ternary battery is good. Iron lithium is more safety. Some discharge data could refer to this issue.

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