Advantages and disadvantages of lithium-ion battery
Lithium-ion battery has the following advantages:
1) Voltage high, single battery Laptop Battery voltage of up to 3.6-3.9V, is a Ni-Cd, Ni-H batteries 3 times
2) than the energy larger than the present to achieve real energy 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 can be Up to 150Wh/kg and 400 Wh / L
3) The long cycle life in general 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) The safety performance is good, pollution-free, no memory effect. As the predecessor of Li-ion batteries, due to the formation of lithium dendrite easy to short-circuit, reducing its application areas: Li-ion does not contain cadmium, lead, mercury, etc. elements of the environment pollution: Some processes (such as sintered) and Ni-Cd batteries there is a major drawback for the "memory effect", seriously ThinkPad R60 hindered the use of batteries, but Li-ion does not exist at this problem.
5) The self-discharge is small, full of electricity at room temperature Li-ion storage a month after the self-discharge rate of about 10%, much lower than Ni-Cd of 25-30%, Ni, MH 30-35%.
6) can quickly charge and discharge, 1C charge is the capacity can reach more than 80% of the nominal capacity.
7) The operating temperature range and high operating temperature of -25 ~ 45 ° C, with the electrolyte and the positive improvements, hoping to broaden the -40 ~ 70 ° C.
Lithium-ion batteries also exist some disadvantages, such as:
1) The high cost of ThinkPad T60 batteries. Mainly reflected in the price of LiCoO2 cathode materials for high-(Co fewer resources), electrolyte purification system difficult.
2) can not be high-current discharge. As the organic electrolyte system, and other reasons, the battery internal resistance compared to other type of batteries big. 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) The need to protect the line control.
A, overcharge protection: Battery over charge would undermine the positive structure, 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;
B, over-discharge protection: over-discharge 40Y6797 recovery of active substances will lead to difficulties, they also need protection circuit control.
Abstract: The development trend of lithium ion batteries, lithium-ion battery outlined mechanism of charging and discharging situation of theoretical studies, summarized as the core technology of the lithium battery positive and negative electrode material prepared by the existing theory and recent developments, review of the cathode materials and anode materials for a variety of preparation methods and prospects for development, highlighting the 40Y6799 current problems and improvements in the field development.