A group of researchers at Stanford University in the United States claim to have built a stable lithium metal anode battery, which is a big step toward this goal. Researchers say the new research is expected to make ultra-light, ultra-small, ultra-large capacity batteries a reality, and wearables, mobile phones and electric vehicles will all benefit.
At present, at least two challenges are faced in the manufacture of lithium anodes: one is the expansion of lithium during charging. When charging, lithium ions will aggregate and expand. Second, the lithium anode has high activity after contact with the electrolyte. This consumes electrolytes and shortens battery life.
To solve these problems, the researchers used carbon as a lithium anode to create a nano-protective layer called "nanospheres." These nanosphere protective layers look like honeycombs in appearance, are flexible and chemically stable, and have a single thickness of only 20 nanometers. The nanosphere can greatly improve the coulombic efficiency (also called charge and discharge efficiency) of the battery, that is, the charge released during discharge and the percentage of charge charged during charging under a certain charge and discharge condition.
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