The advantages and disadvantages of Lithium-ion battery

Feb 24
2010

Lithium-ion battery has the following advantages:

  1. High voltage, voltage of single battery go up to 3.6-3.9V,and it is 3 times than a Ni-Cd, Ni-H batteries ,such as Dell inspiron 6000 battery .
  2. Larger specific energy , at present real energy is 100-125Wh/kg and 240-300Wh / L (2 times higher than Ni-Cd, 1.5 times higher than Ni-MH), the future, as technological development, specific energy up to 150Wh/kg and 400 Wh / L
  3. Long cycle life, in general, Lithium-ion battery can reach more than 500 times, or even 1000 times or more. For a small electrical current discharge, the battery will double the lifespan of electrical appliances competitiveness.
  4. Safety performance is good, and pollution-free, no memory effect. like the Dell inspiron 6400 battery . As the predecessor of Li-ion batteries, the formation of lithium dendrite easy to short-circuit reduce its application areas: Li-ion does not contain cadmium, lead, mercury and other elements of the environment pollution: Some processes (such as sintered) and Ni-Cd batteries there is a major drawback for the “memory effect”, seriously hindered the use of batteries, but Li-ion does not exist at this problem.
  5. Self-discharge is small, after full of electricity at room temperature Lithium-ion battery is storaged for a month ,the self-discharging rate is about 10%, much lower than Ni-Cd of 25-30%, Ni, MH 30-35%.
  6. Can quickly charge and discharge,for one thing ,the Fujifilm np-40 . 1C charging capacity can reach more than 80% of the nominal capacity.
  7. Operating temperature range is high, operating temperature is -25 ~ 45 ° C, with the electrolyte and the positive improvements, it is hoped to broaden the -40 ~ 70 ° C.

Lithium-ion batteries also exist some disadvantages, such as:

  1. Battery costs are higher.take the Fujifilm np-100 battery for example. it mainly reflected in the price of LiCoO2 cathode materials for high-(Co resources to small), electrolyte purification system difficult.
  2. Not high-current discharge. As the organic electrolyte system, and other reasons, the battery internal resistance is big ,compared to other type of batteries. Therefore, I demand a smaller discharge current density, the discharge current at 0.5C below normal, only suitable for small and medium-current electrical use.
  3. Iit need to protect line control.
  • Overcharge protection: Battery over charging would undermine the positive structure, for one thing ,the Dell inspiron e1505 battery . which affects the performance and life; the same time, the overcharge to the electrolyte decomposition, excessive internal pressure caused by leakage and other problems; and therefore must be under constant pressure 4.1V-4.2V charge;
  • Over-discharge protection: over-discharge recovery of active substances will cause difficulties, they also need protection circuit control.

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