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Metal-organic framework glass stabilizes high-voltage cathodes for efficient lithium-metal batteries
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Metal-organic framework glass stabilizes high-voltage cathodes for efficient lithium-metal batteries
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Journal Article
Metal-organic framework glass stabilizes high-voltage cathodes for efficient lithium-metal batteries
2025
Overview
The rapid evolution of portable electronics and electric vehicles necessitates batteries with high energy density, robust cycling stability, and fast charging capabilities. High-voltage cathodes, like LiNi
0.8
Co
0.1
Mn
0.1
O
2
(NCM-811), promise enhanced energy density but are hampered by poor stability and sluggish lithium-ion diffusion in conventional electrolytes. We introduce a metal-organic framework (MOF) liquid-infusion technique to fully integrate MOF liquid into the grain boundaries of NCM-811, creating a thoroughly coated cathode with a thin, rigid MOF Glass layer. The surface electrically non-conductive MOF Glass layer with 2.9 Å pore windows facilitating Li-ion pre-desolvation and enabling highly aggregative electrolyte formation inside the Glass channels, suppressing solvated Li-ion co-insertion and solvent decomposition. While the inner Glass layer composes of Li-ion conducting components and enhancing fast Li-ion diffusion. This functional structure effectively shields the cathode from particle cracking, CEI rupture, oxygen loss, and transition metal migration. As a result, Li | |Glass@NCM-811 cells demonstrate good rate capability and cycling stability even under high-charge rates and elevated voltages. Furthermore, we also achieve a 385 Wh kg
-1
pouch-cell (19.579 g, for pouch-cell), showcasing the practical potential of this method. This straightforward and versatile strategy can be applied to other high-voltage cathodes like Li-rich manganese oxides and LiCoO
2
.
Li-ion batteries based on high-voltage Ni-rich layered oxides are hampered by stability and ion diffusion issues. Here, authors develop a metal-organic-framework liquid-infusion technique to create a rigid glass layer on the oxide particles, improving both Li
+
diffusion and battery stability.
