What are the advantages and disadvantages of lithium-ion batteries?

Lithium ion battery has the following advantages:

1) high voltage, monomer battery working voltage is 3.6-3.9 V, is Ni - Cd, Ni - H battery 3 times 2) is greater than the energy, and can achieve the actual current than the energy of 100-100 wh/kg and wh/L, 240-300 (2 times the Ni - Cd, 1.5 times the Ni MH), in the future with the development of technology, the specific energy can be as high as 150 wh/kg and wh/L 400

3) long cycle life, generally all can reach more than 500 times, even more than 1000 times. For small discharge current of electric equipment, will double the competitiveness of the electric battery life.

4) good safety performance, pollution-free, no memory effect. As Li - ion predecessorThe lithium battery, for easy to form metallic lithium dendrite short circuit, reduced its areas of application: Li - ion in do not contain cadmium, lead, mercury and other elements of environmental pollution: some process (such as sintering type) of the one big drawback of Ni - Cd battery exist for "memory effect", it severely battery, but Li - ion this aspect of the problem doesn't exist.

Uniformity 5), a full charge of Li - ion storage at room temperature after 1 month of self-discharge rate was 10%, much lower than 25-30% of Ni - Cd, Ni and MH 30-35%.

6) can fast charge and discharge, is 1 c charging capacity can reach more than 80% of the nominal capacity.

7) operating temperature range, high working temperature is 25 ~ 45 ° C, as the electrolyte and the improvement of the anode, is expected to widen to - 40 ~ 70 ° C.

Lithium-ion batteries also exist some shortcomings

1) battery costs more.Mainly manifested in the price of the cathode material LiCoO2 high fewer resources (Co), electrolyte systems purification difficulties.

2) can't large current discharge.Due to reasons such as organic electrolyte system, battery internal resistance than other kind of battery.Therefore require smaller discharge current density, average discharge current under 0.5 C, only suitable for small and medium-sized electric current of electrical appliances.

3) the need to protect line control.

A, overcharge protection, battery overcharge will break the anode structure and affects the performance and life;At the same time of charging the electrolyte decomposition, such as high internal pressure caused by leakage problem;So it must be under constant voltage of 4.1 V to 4.1 V batteries;

B, discharge protection: discharge will lead to the recovery of active material is difficult, so it also needs to have protection line control.

4) rechargeable batteries

Rechargeable batteries, also known as: battery, secondary battery, the battery can be recharged use.Common are: lead-acid battery (used in automobile, commonly known as the "battery"), nickel cadmium batteries, nickel-metal hydride batteries, lithium ion batteries.

5) the capacity of the battery

The capacity of the battery to point to in a certain discharge conditions, the battery discharge to cut-off voltage out of battery.IEC standard nickel cadmium and nickel metal hydride batteries in 20 + / - 5 ℃ environment, with 0.1 C 16 hours after charging to 0.2 C discharge of energy that is released by 1.0 V battery for the capacity of the battery.Units have Ah, mAh

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