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Dual-Salt Synergistically Induces the Formation of Organic–Inorganic Hybrid Solid Electrolyte Interphase to Suppress Lithium Dendrites
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DOI：10.1002/celc.70236.png)
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Abstract
En 中文
The uncontrolled growth of lithium dendrites in lithium metal anodes (LMA) remains a critical challenge for high-energy-density batteries, largely due to the formation of unstable solid electrolyte interphases (SEI) in conventional ester-based electrolytes. Herein, we report a rationally designed dual-salt electrolyte that constructs a mechanically robust and highly lithium-ion conductive organic–inorganic hybrid SEI on LMA surfaces. The dual salts synergistically induce the formation of ionically conductive inorganic components, including LiF, Li2O, and Li3N, while simultaneously catalyzing the ring-opening polymerization of cyclic ether solvents. This results in a SEI with enhanced flexibility and Li+ transport, effectively suppressing dendritic lithium growth. Electrochemical evaluations show that the LMA with optimal dual-salt electrolyte achieves a Coulombic efficiency (CE) of 99.15%, and Li||LiFePO4 full cells retain 96.42% of the capacity over 200 cycles with an average CE of 99.3%. These findings highlight a synergistic interfacial engineering strategy, offering a promising pathway toward practical and safe LMA.
Keywords:
ether-based electrolyte
lithium difluoro(oxalato)borate
lithium metal anode
lithium nitrate
organic–inorganic hybrid SEI
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