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The cathode material of lithium ion batteries is lithium cobalt oxide, and the anode is carbon. The working principle of a lithium-ion battery refers to its charging and discharging principle. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon as the negative electrode has a layered structure. It has many micropores. The lithium ions that reach the negative electrode are embedded in the micropores of the carbon layer. The more lithium ions are inserted, the higher the charging capacity. In the same way, when the battery is discharged (that is, the process when we use the battery), the lithium ions embedded in the carbon layer of the negative electrode are released and move back to the positive electrode. The more lithium ions returned to the positive electrode, the higher the discharge capacity. What we usually call battery capacity refers to the discharge capacity. So what are the advantages and disadvantages of lithium-ion batteries?
What are the advantages and disadvantages of lithium-ion batteries?
What are the advantages and disadvantages of lithium-ion batteries? Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources, although their prices are relatively expensive. What are the advantages and disadvantages of lithium-ion batteries?
Lithium-ion battery has a high energy density, its capacity is 1.5 to 2 times that of a nickel-hydrogen battery of the same weight, and it has a very low self-discharge rate.
In addition, lithium-ion batteries have almost no "memory effect", which is very convenient for mobile phone users. Users do not need to discharge and then charge each time they charge, but can charge the phone at any time.
Li-ion batteries do not contain toxic substances and other advantages are also important reasons for its widespread use.
Lithium batteries are generally marked with English lithium ion battery, lithium secondary battery or lithium-ion rechargeable battery. When purchasing batteries, users must read the signs on the exterior of the battery block to avoid mistaken cadmium-nickel and nickel-hydrogen batteries for lithium batteries because they fail to see the battery type.
What are the disadvantages of lithium-ion batteries?
1. High cost. The main reason is the high price of the cathode material LiCo02. With the continuous development of cathode technology, LiMn204, LiFeP04, etc. can be used as the anode, which is expected to greatly reduce the cost of lithium-ion batteries.
2. There must be a special protection circuit to prevent overcharging or overdischarging.
3. Compatibility with ordinary batteries is poor, because generally three ordinary batteries (3.6V) can be used to replace lithium-ion batteries.