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What is lithium nitride and its application?

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Update time : 2021-11-11 14:36:18
What is lithium nitride?
Lithium nitride is a metal nitrogen compound with a molecular formula of Li3N. It is a purple or red crystalline solid with a light green luster in reflected light and a ruby ​​color in transmitted light. Long-term exposure to the air will eventually become lithium carbonate. The chemistry of basic metal nitrides is extremely limited. Among the binary compounds, only lithium nitride is stable and easy to prepare.
At room temperature, metallic lithium can partially generate lithium nitride when exposed to the air. Lithium generates lithium nitride in a nitrogen stream, which is 10-15 times faster than in the air. At this time, all lithium is converted into lithium nitride. Compared with this property, it is difficult for other alkali metals to form nitrides. For example, sodium nitrite can only be prepared by deposition on sapphire with the atomic beam at low temperature, and it will decompose after a little heating. Lithium nitride is easily hy-drolyzed to generate lithium hy-droxide and ammonia gas, especially fine powdered lithium nitride, which can burn violently when heated in the air. Therefore, lithium nitride must be handled in an inert atmosphere (such as nitrogen).
Lithium Nitride Preparation
The preparation of lithium nitride can be made by directly reacting elemental nitrogen and lithium. It is usually made by burning lithium in pure nitrogen. Whether in the laboratory or in industry, this method is the best way to prepare lithium nitride. Commonly used methods. In addition, nitrogen can also be passed into liquid sodium dissolved with metallic lithium, and the lithium nitride prepared by the latter has a higher purity.

Lithium Nitride Application
Solid electrolyte
Lithium nitride is a fast ion conductor and its conductivity is higher than other inorganic lithium salts. There have been many studies on the application of lithium nitride as a solid electrode and cathode material for batteries.
Preparation of cubic boron nitride
In addition to being used as a solid electrolyte, lithium nitride is also an effective catalyst for the conversion of hexagonal boron nitride to cubic boron nitride.
Electron injection layer of the organic light-emitting device
Lithium nitride (Li3N) is used as a dopant to be incorporated into the Alq3 layer of electron transport material to improve the performance of the OLED device. It has been reported in the literature that Li3N as a buffer layer between the electron injection layer and the cathode can improve the performance of the device.
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