Lithium-ion battery advantages and applications
Lithium-ion batteries have the following significant advantages over other types of batteries.
1 working voltage is high. The working voltage of lithium cobalt oxide lithium ion battery is 3.6V, the working voltage of lithium manganese oxide lithium ion battery is 3.7V, the working voltage of lithium iron phosphate lithium ion battery is 3.2V, and the nickel hydrogen and nickel cadmium battery The operating voltage is only 1.2V.
2 high energy density. The theoretical energy density of lithium ion battery cathode material can reach more than 200W·h/kg. In practical applications, due to irreversible capacity loss, the energy density is usually lower than this value, but it can also reach 140W·h/kg, which is still nickel cadmium. 3 times the battery and 1.5 times the nickel-hydrogen battery.
3 cycle life is long. At present, in the case of deep discharge, the number of cycles of lithium-ion batteries can reach more than 1000 times; under the condition of low discharge depth, the number of cycles can reach tens of thousands of times, and its performance is far superior to other similar batteries.
4 self-discharge is small. The monthly self-discharge rate of lithium-ion batteries is only 5% to 9% of the total capacity, which greatly alleviates the problem of power loss caused by self-discharge when the conventional secondary battery is placed.
5 no memory effect.
6 high environmental protection. Compared with the traditional environmental problems caused by the waste of traditional lead-acid batteries, nickel-cadmium batteries and even nickel-hydrogen batteries, lithium-ion batteries do not contain harmful elements such as mercury, lead and cadmium, and are truly green batteries. Sixth, the application status of lithium-ion batteries With the rapid development of mobile electronic equipment and increasing energy demand, people's demand for lithium-ion batteries is also growing. Lithium-ion battery's high capacity, moderate voltage, wide source and long cycle life, low cost, good performance, no pollution to the environment, etc., determine that it can not only be applied to mobile communication tools, but also may be rapidly The power supply for the development of electric vehicles.
Lithium-ion battery usage category
(1) Applications in portable electrical appliances Currently, mobile phones, notebook computers, and miniature video cameras that require portable power supplies have become an indispensable part of people's lives. In terms of power supply, lithium-ion batteries are selected as the market without exception. Mainstream. According to statistics, the global mobile phone production is nearly 2.1 billion units per year, and the annual production of notebook computers is about 150 million units worldwide, forming a huge market for lithium-ion battery applications. In this field, lithium cobalt oxide and lithium manganese oxide lithium batteries dominate.
(2) Application in the transportation industry With the progress of social civilization, people's awareness of environmental protection has increased and the environmental requirements have become increasingly high. Environmentally-friendly vehicles have entered people's field of vision. At present, electric light-duty vehicles based on electric bicycles in China are showing a booming trend. Lithium-ion batteries have begun to be used in some high-end models. In the development of electric vehicles, lithium-ion batteries have become mainstream. In China, more than half of the electric vehicles developed by many automobile development and production companies have adopted lithium-ion batteries, and they are gradually expanding. Internationally, pure electric vehicles and plug-in hybrid vehicles that have been announced for sale, such as Nissan's Leaf, Mitsubishi's i-MiEV, and General Motors' Volt, all use lithium-ion battery systems.
(3) Application in military equipment and aerospace industry In military equipment, lithium-ion batteries are mainly used as power starting power, wireless communication radio power, micro-unmanned reconnaissance aircraft power supply, etc. In addition, such as laser sights, Lithium-ion batteries are now commonly used in night vision devices, pilot life-saving radio power supplies, and the like. In the aerospace industry, lithium-ion batteries have been used in geosynchronous orbit satellites and low-orbit communication satellites as a means of launch and in-flight correction, ground operations.
(4) The structural characteristics and special working principle of other lithium-ion batteries determine the characteristics of rich raw materials, environmental protection, high specific capacity, good cycle performance and good safety performance in the medical industry (for example, hearing aids, pacemakers). Etc.), petrochemical industry (for example, oil production power load adjustment), power industry (for example, energy storage power), etc. have broad application prospects. In today's pursuit of green energy, it has more important significance.