What is the difference between lithium air battery and lithium ion battery?

What is the difference between lithium-air batteries and lithium-ion batteries? At present, the research focus of lithium-ion batteries is mainly concentrated on lithium-air batteries and lithium-sulfur batteries. Li-air batteries have a higher energy density than lithium-ion batteries because its negative electrode (mainly made of porous carbon) is very light, and oxygen is obtained from the environment rather than stored in the battery. This article talks about the difference between the two energy-saving appliances author. What is the difference between lithium air battery and lithium ion battery? Lithium ion battery. JPG Lithium-ion batteries In lithium-ion batteries, carbon is negative, while metal oxides, such as cobalt, manganese, and iron, are positive. Both are immersed in an electrolyte containing lithium salt. During the charging process, lithium ions move from the positive electrode (cathode) to the porous carbon (anode) and are embedded in the carbon material. The external current flows from the negative electrode to the positive electrode (electrons flow from the positive electrode to the negative electrode), forming a closed loop. During the discharge process, lithium ions are separated from the negative electrode and return to the positive electrode. The external current flows from the positive electrode to the negative electrode (electrons flow from the negative electrode to the positive electrode). The final size of the battery depends on how much material can hold lithium ions, which depends on the size and quality of the electrode. Principle of Lithium Ion Battery When the battery is charged, lithium ions are formed on the positive electrode of the battery, and the lithium ions reach the negative electrode through the electrolyte. Negative carbon has a layered structure with many micropores. Lithium ions reaching the negative electrode are inserted into the micropores of the carbon layer. The more lithium ions are inserted, the greater the charging capacity. In the same way, when the battery is discharged (the process we use the battery), the lithium ions embedded in the negative electrode carbon will come out and return to the positive electrode. The more lithium ions return to the positive electrode, the greater the discharge capacity. The battery capacity we usually call refers to the discharge capacity. It is not difficult to see that during the charging and discharging process of lithium-ion batteries, lithium ions are in a state of movement from the positive electrode to the negative electrode and then to the positive electrode. If we compare a lithium-ion battery to a rocking chair, the two ends of the rocking chair are the two poles of the battery, and the lithium ion is like an excellent athlete, moving back and forth on both ends of the rocking chair. Therefore, experts gave lithium-ion batteries a lovely name: rocking chair batteries. Lithium-air battery The lithium-air battery is a battery that uses lithium as the negative electrode and oxygen in the air as the positive electrode reactant. Li-air batteries have a higher energy density than lithium-ion batteries because its negative electrode (mainly made of porous carbon) is very light, and oxygen is obtained from the environment rather than stored in the battery. Lithium-ion batteries require lithium compounds and graphite as electrodes, while lithium-air batteries can directly use lithium metal (Li) and oxygen (O2) in the air as electrodes. In the most ideal case, when the battery is discharged, lithium peroxide (Li2O2) is produced by the lithium oxide element of oxygen, which causes current in the external circuit. When charging, lithium peroxide decomposes into lithium and oxygen. The whole process does not involve other heavy elements, even air can be used directly, and the weight and cost are negligible! Therefore, lithium-air batteries can obtain a higher energy density than lithium-ion batteries. In fact, because lithium is the metal element with the lightest relative atomic mass in the periodic table, and oxygen in the air, the energy density of lithium-air batteries is the highest. In other words, lithium-air batteries per unit mass can store and Release energy than all other electrochemical energy storage media. The theoretical energy density of non-liquid lithium-air batteries is as high as 12 kilowatt-hours per kilogram, which is 5 to 10 times that of existing lithium-ion batteries, and is almost as high as gasoline, about 13 kilowatt-hours per kilogram. If lithium-air batteries can finally enter the market, the range of electric vehicles will be equivalent to that of gasoline vehicles, which will completely break through the bottleneck caused by low energy density of lithium-ion batteries, which is of great significance to the development of clean energy in the future. Li-air battery work The concept of lithium-air battery was first proposed by Lockheed, and the electrolyte is an alkaline aqueous solution. Oxygen undergoes an oxygen reduction reaction on the air electrode to form hydroxide radicals. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.