Advantages of Li-ion power lithium battery

1. High voltage: The working voltage of single cell is up to 3.7-3.8V (the voltage of the cell can be charged up to 4.2V), which is 3 times higher than that of Ni-Cd and Ni-H batteries.
2. Large specific energy: the actual specific energy that can be achieved is about 555Wh/kg, i.e. the material can reach a specific capacity of more than 150mAh/g (3-4 times that of Ni-Cd, 2-3 times that of Ni-MH), which is close to about 88% of its theoretical value.
3. long cycle life: generally can reach more than 500 times, or even more than 1000 times, lithium iron phosphate can reach more than 2000 times. On the small current discharge of the appliance, the battery life, will multiply the competitiveness of the appliance.
4.  Good safety performance: no pollution, no memory effect. As Li-ion predecessor of lithium-ion batteries, because of the easy formation of lithium metal dendrites short circuit, reducing its application areas: Li-ion does not contain cadmium, lead, mercury and other elements of environmental pollution: part of the process (such as sintered) of Ni-Cd batteries have a major drawback for the memory effect, a serious constraint on the use of batteries, but Li-ion does not exist in this regard.
5. Small self-discharge: The self-discharge rate of a fully charged Li-ion at room temperature is about 2% after 1 month of storage, which is much lower than 25-30% for Ni-Cd and 30-35% for Ni and MH.
6.  can be quickly charged and discharged: 30 minutes of charging capacity can reach more than 80% of the nominal capacity, and now phosphorus-iron batteries can reach 10 minutes of charging to 90% of the nominal capacity.
7. g, high operating temperature range: the operating temperature of -25 ~ 55C, with the electrolyte and cathode improvement, expect to expand to -40 ~ 70C.

Li-ion power lithium battery disadvantages.

Aging: Unlike other rechargeable batteries, the capacity of lithium-ion batteries will decline slowly, not related to the number of uses, but to the temperature. The possible mechanism is a gradual increase in internal resistance, so it is more likely to be reflected in electronic products with high operating current. Replacing graphite with lithium titanate seems to extend the life.

Relationship between storage temperature and the rate of permanent loss of capacity.

intolerant to overcharge: when overcharged, excessive embedded lithium ions will be permanently fixed in the lattice and cannot be released again, which can lead to short battery life and gas production resulting in gas bulge.

intolerant to over-discharge: over-discharge, electrode deembedding too much lithium ions, can lead to lattice collapse, thus shortening the life and gas production caused by gas drums.

to multiple protection mechanisms: Since the wrong use will reduce the life, and may even lead to an explosion, so the lithium-ion battery is designed with a variety of new protection mechanisms.

Protection circuit: to prevent overcharge, overdischarge, overload, overheating.

Venting hole: to prevent excessive pressure inside the battery.

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