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The important battery cells for assembling lithium-ion battery packs include 18650 cells, lithium polymer cells, and lithium iron phosphate square cells, which are also common materials for lithium-ion battery pack cells.

1) 18650 battery cells

The positive electrode materials for 18650 battery cells are generally lithium iron phosphate, lithium manganese oxide, and ternary materials on the market.

Lithium manganese oxide

Lithium manganese oxide is a battery cell material with a long history of use in lithium-ion batteries. Its safety is relatively high, especially its strong ability to resist overcharging. In addition, its material prices are also relatively cheap, and the production process requirements are relatively low. But it also has obvious defects, such as poor high-temperature performance of lithium manganese oxide.

2) Lithium iron phosphate

The advantages of lithium iron phosphate lie in its safety and service life, but the disadvantages are also quite obvious. The lifespan of a single lithium iron phosphate battery is long, around 2000 cycles, but the lifespan of the battery pack is short, generally around 500 cycles, and the low-temperature performance is poor.

Ternary lithium

The advantage of ternary lithium cathode materials is that they can form synergistic effects within the same battery cell, and all meet the three requirements of material structure stability, activity, and low cost. The disadvantage of ternary materials, which have been mentioned frequently, is their safety. During the process of thermal runaway, the substances they produce contain a large amount of toxic gases, making them more dangerous.

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