According to foreign media reports, although lithium metal anodes can promote the development of next-generation high-energy-density battery systems, the metal lithium reacts to liquid electrolytes, has low efficiency in practical applications, and has potential safety hazards, which hinders the material. Practical application. To address this contradiction, a team of researchers at Stanford University demonstrated the use of nanodiamond films to protect the surface of lithium metal, which can be plated underneath the film and prevent parasitic reactions with the electrolyte.
The nano-diamond film not only has excellent electrochemical stability, but also has an extremely high modulus for suppressing lithium dendrites. Because pinholes in the surface protection layer can disrupt the uniformity of ion flux, Stanford researchers have developed a unique two-layer structure to compensate for design flaws, that is, defects in one layer can be screened through another complete layer.
The university team synthesized the nanodiamond interface by microwave-plasma chemical vapor deposition (MPCVD) technology, which is very low cost in coating applications. The nano-diamond interface has a very high modulus of more than 200 GPa, which is the highest value actually measured in the lithium metal artificial coating reported so far, and can effectively prevent the growth of lithium metal dendrites.
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