Potential uses of lithium-air batteries

Metal-air battery technology The development of metal-air batteries, especially lithium-air batteries, has attracted widespread attention and aroused widespread attention. The lithium-air battery uses metallic lithium as the negative electrode and oxygen in the air as the positive electrode active material. Through the electrochemical reaction of lithium and oxygen, the mutual conversion of electrical energy and chemical energy is completed. The theoretical energy density of the battery is about 3,500 watt-hours/kg, which is 10 times that of lithium batteries and close to gasoline. Focusing on the potential uses of lithium-air batteries, countries around the world have carried out relevant research work. IBM has been working on its Battery 500 project, which aims to end the policy of 500 miles for electric vehicles on a single charge. The participation of Japanese companies such as Asahi Glass will promote gap and electrolyte research. Lithium-air battery is not a new concept; it was first proposed by Lockheed researchers in 1976. In 1996, Abraham et al. proposed an organic electrolyte system, which created a new situation in the research of lithium-air batteries. At present, research on lithium-air batteries is mainly focused on the positive electrode, which directly chooses the purpose of the battery. In terms of energy density, graphene materials are the most representative. Researchers from the Pacific Northwest National Laboratory (Pacificnorthwestnationallaboratory) have produced a layered graphene material with a bubble-like structure. The final discharge capacity is about 15,000 mAh/g, which is much larger than the existing lithium. battery. However, the oxygen-containing products generated during the charging and discharging process of the lithium-air battery and the carbon material and the electrolyte react, resulting in the generation of many by-products (lithium carbonate, etc.), which will greatly affect the battery's cycle process and limit its opening Bottleneck problem. Bruce et al. applied porous gold and titanium carbide to the positive electrode, which can be used to inhibit side reactions, and the retention rate of 100 cycles is greater than 95%. High energy density is an important advantage of lithium-air batteries, and the stability of the cycle is the key technology and the problem it faces. On the other hand, the purification of metal lithium, the protection of lithium anodes and the charging and discharging of the dendrites, the development of components with high catalytic activity, positive electrodes, oxygen selective permeation membranes, and the battery structure design of integrated technology are all issues to be addressed. The actual process. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it. Previous post: Do you need to activate the new lithium battery?