Four types of boron-nitride powder are available: hexagonal (HBN), Rhombohedral (RBN), cubic (CBN), WUBZITE (WBN) and cubic (RBN). Typically, boron is produced in a graphite structure. It's also commonly called white graphite. There is increasing demand for battery power storage, safety, and longevity. This is a growing concern as more people rely on mobile devices and other electric vehicles to get their energy. Yuan Yang, an assistant professor in materials science and engineering from Overseas University, has announced that a new way to extend the life of a battery was discovered. This is done by installing a nanocoating of boron nutride (BN) to stabilize solid electrolytes within a lithium metal.

The majority of lithium ion battery types are used daily in everyday life. Low energy density batteries can cause short circuits and even fires. The battery's highly volatile liquid electrolyte may make them less useful. An alternative to graphite, lithium metal can be used in lithium-ion batteries. This increases the battery's energy density. The theoretical charge capacity of lithium metal is nearly 10x that of graphite. It is easy to form dendrites during the lithium plating process. Short circuits can result if dendrites enter the separator.

Yang explained that she decided to make solid ceramic electrolytes. Solid ceramic electrolytes are more effective than traditional lithium-ion batteries' flammable ones in terms of energy density and safety.

The majority of solid electrolytes made out of ceramic are non-flammable and thus do not pose any safety risks. Solid ceramic electrolytes have a high mechanical strength that can inhibit the growth and formation of lithium dendrites. The lithium metal can then be coated with the anode. But, solid electrolytes tend to be unstable to lithium and can easily be corroded by the lithium metal. They cannot therefore not used in batteries.

To address these challenges, the research team collaborated with the Brookhaven National Lab and the City University of New York deposited a 5 to 10 nm boron nitride (BN) nanofilm as a protective layer to insulate the electrical contact between the metallic lithium and the ionic conductor (solid electrolyte), a small amount of polymer or liquid electrolyte is added to penetrate the electrode/electrolyte interface.

Because it's chemically, mechanically and electrically stable to lithium, boron Nitride was selected by researchers for the protective layer. Boron nitride was designed with holes within it that allow lithium ions to flow, which made it an ideal separator. Chemical vapor deposition makes it easy to prepare boron-nitride at large scale (decimeter-scale), and atom-like thin (nanoscale).

Researchers are currently expanding their method to unstable solid electrolytes.

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tags: Semiconductors semiconductor industry