Anode slurry containing additives for lithium metal particle electrodes, anode and lithium secondary battery using the same, and manufacturing method thereof

Lithium metal particle anode slurry forming a Li3N-rich SEI layer with an inorganic protective coating of nitrates and nitrides

This technology suppresses dendrite growth by coating the surface of lithium metal particles with nitrate/nitride-based inorganic particles and a binder, which in-situ forms a highly ion-conductive Li3N-rich SEI layer on the electrode surface during charge and discharge cycles.

Anodes using lithium powder have historically been difficult to process into slurries due to their high reactivity. Furthermore, lithium dendrites formed during cycling cause non-uniform current density, which limits battery lifespan.

This technology involves creating a slurry by mixing lithium metal particles, a binder, and nitrate/nitride-based inorganic particles (such as LiNO3) at a molar ratio of LiNO3 to the sum of LiNO2 and Li3N between 20:1 and 1:1. This forms a uniform protective layer on the anode surface, ensuring the stable formation of an SEI layer during battery operation. It can be applied to the manufacturing of anodes for lithium metal batteries, high-energy-density drones, and electric vehicles, paving the way for large-scale production of lithium metal anodes using existing slurry coating equipment.

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Key Features:

• Inorganic particles composed of alkali or alkaline earth metal nitrates or nitrides, positioned with a binder on the surface of lithium metal particles
• Inorganic particles containing LiNO3 and the sum of LiNO2 and Li3N in a molar ratio of 20:1 to 1:1
• A protective layer with a thickness of 5 to 50 nm, formed by uniformly dispersing the binder and inorganic particles on the lithium metal particles
• An SEI layer formed in a uniform film or island pattern on the lithium metal particles, containing LiNO3 and Li3N-based components

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