What is the difference between lithium battery and lithium ion battery

by:CTECHi     2021-07-13

Bluetooth generally does not use batteries! (refers to the batteries on the market) just charge! But there are some exceptions! Because there are too many brands on the market! Because Bluetooth is synonymous with wireless headsets! So it looks like An earplug that hangs on the ear! There are also earphones that look like a headset! (This kind of headset can listen to music in stereo)! For example, the headset in the Lenovo 807 Collector's Edition is stereo! 1, has a higher energy-to-weight ratio, energy Volume ratio; 2. The voltage is high, the voltage of a single lithium battery is 3.6V, which is equal to the series voltage of three nickel-cadmium or nickel-hydrogen rechargeable batteries; 3. The self-discharge is small and can be stored for a long time, which is the most prominent advantage of the battery 4. No memory effect. Lithium batteries do not have the so-called memory effect of nickel-cadmium batteries, so lithium batteries do not need to be discharged before charging; 5. Long life. Under normal working conditions, the number of charge/discharge cycles of lithium batteries is much greater than 500 times; 6 , Can be quickly charged. Lithium batteries can usually be charged with a current of 0.1 times the capacity, which shortens the charging time to 1 to 2 hours; 7. Can be used in parallel at will; 8. Because the battery does not contain heavy metal elements such as cadmium, lead, mercury, etc., It has no pollution to the environment and is the most advanced green battery in modern times; Li-ion battery has the following advantages: 1) High voltage, the working voltage of single battery is as high as 3.6-3.9V, which is 3 times that of Ni-Cd and Ni-H batteries 2) The specific energy is large, and the actual specific energy that can be reached at present is 100-125Wh/kg and 240-300Wh/L (2 times Ni-Cd, 1.5 times Ni-MH). With the development of technology in the future, the specific energy can be as high as 150Wh /kg and 400Wh/L3) Long cycle life, generally can reach more than 500 times, or even more than 1000 times. For small current discharge electrical appliances, the battery life will double the competitiveness of electrical appliances. 4) Good safety performance, no pollution , No memory effect. As the predecessor of Li-ion, the lithium battery is short-circuited due to the easy formation of dendrites due to metal lithium, which reduces its application fields: Li-ion does not contain cadmium, lead, mercury and other elements that pollute the environment: part The major drawback of Ni-Cd batteries with technology (such as sintered) is the 'memory effectThe self-discharge rate of Li-ion after 1 month storage is about 10%, which is much lower than 25-30% of Ni-Cd and 30-35% of Ni and MH. 6) It can be charged and discharged quickly, and 1C charge is the capacity It can reach more than 80% of the nominal capacity. 7) The working temperature range is high, and the working temperature is -25~45°C. With the improvement of electrolyte and positive electrode, it is expected to be expanded to -40~70°C. Lithium-ion battery There are also certain shortcomings, such as: 1) The cost of the battery is high. It is mainly manifested in the high price of the cathode material LiCoO2 (the resource of Co is less), and the purification of the electrolyte system is difficult. 2) High current discharge is not possible. Due to the organic electrolyte system, etc. The reason is that the internal resistance of the battery is larger than that of other types of batteries. Therefore, a smaller discharge current density is required, and the general discharge current is If the current is below 0.5C, it is only suitable for the use of small and medium current electrical appliances. 3) Protection circuit control is required. A. Overcharge protection: Overcharge of the battery will destroy the structure of the positive electrode and affect the performance and life; at the same time, overcharge will decompose the electrolyte. Excessive pressure leads to problems such as liquid leakage; therefore, it must be charged under a constant voltage of 4.1V-4.2V. B. Over-discharge protection: Over-discharge will cause difficulty in the recovery of active materials, so protection circuit control is also required.: Summary The development trend of lithium-ion batteries, the theoretical research status of the charging and discharging mechanism of lithium-ion batteries is briefly described, the existing preparation theories and recent developments of the positive and negative electrode materials of lithium batteries as the core technology are summarized, and the positive electrode materials and Various preparation methods and development prospects of anode materials, focusing on the current problems and improvements in this field. High cost. Compared with other rechargeable batteries, lithium batteries are more expensive

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