US researchers have devised a new material that can be expected to be used to make large-capacity lithium-ion batteries with stable performance, extending the life of smart phones, electric vehicles, etc., to more than double the current lifespan.
The Northwestern University issued a press release a few days ago, saying that the new material is lithium magnesium oxide doped with chromium and vanadium. The use of lithium-magnesium oxide as a positive electrode of a lithium-ion battery can greatly increase the capacity of the battery and provide stable performance without rapid degradation.
Lithium-ion batteries generally use lithium, oxygen, and a transition metal compound as the positive electrode, in which the transition metal is responsible for the storage and release of electrical energy, the nature of which determines the capacity of the battery. Currently cobalt is commonly used. Previous studies have found that replacing cobalt with magnesium The capacity can be increased and the cost can be reduced, but the battery performance is degraded too quickly, and it drops sharply after two rounds of charge and discharge.
The research team of Northwest University published a paper in the United States "Scientific Progress" magazine. They established a detailed model of a single atom for a lithium magnesium oxide material, analyzed the charge-discharge process, and found that oxygen also participates in the storage of electrical energy. Larger.
The researchers then tried a scheme to incorporate different elements into lithium magnesium oxide and calculated the energy storage effect of various mixtures. It was found that the incorporation of chromium and vanadium can achieve the stability performance while maintaining the large capacity of the battery. Next they will be in the experiment. Room to test the actual performance of new materials.
