What's a lithium air battery?

At present, lithium batteries used in electric vehicles are also a major problem in addition to the large size of space. This may change in the future, however, because researchers at the University of Cambridge in the United Kingdom have recently successfully developed a lithium air battery that, in addition to being lighter, is said to have more than 2,000 recycling charges and more than 90 % energy performance.

Since the introduction of lithium-ion batteries 25 years ago, it has been widely used by many electronic products in recent years. Although it is lighter than traditional batteries regardless of its size and weight, electric vehicles have become more common in recent years. Now scientists are focusing on developing lithium-air batteries that are more energy-dense and lighter in order to reduce the burden of weight on cars, which can increase the overall distance.

In fact, scientists have previously successfully produced lithium air batteries. The principle is mainly to produce lithium oxide(Li2O2) through the positive and negative poles and the chemical reactions between lithium ions and oxygen, and infiltrate the carbon electrode to generate electricity.; Conversely, when charging, the entire process will be reversed. However, it is a pity that due to the extremely high activity of lithium oxide and the decomposition of the electrolyte in the battery, when used for a period of time, the power will soon drop, which greatly affects the performance of the battery. Due to this unstable disadvantage, even if R&D is successful, it has not yet been formally used for commercial purposes.

However, after many attempts and improvements, researchers at the University of Cambridge recently discovered that as long as graphene is used as the positive electrode, the substance produced in the chemical reaction will become a more stable lithium hydroxide. Reduce the impact on the electrolyte, directly improve the battery life, the maximum cycle charge and discharge more than 2,000 times. In addition, the researchers also pointed out that the energy density of this new battery can theoretically reach 3,350Wh/kg, which is more than ten times higher than the current 140-250Wh/kg of lithium-ion batteries, which means that it can be designed. A smaller battery can save more space by being installed in various devices and electric vehicles.

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