Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202305988
Keywords
Cathode Electrolyte Interphase; Lithium-Ion Batteries; Silicon-Based Anode; Solid Electrolyte Interphase
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This study focuses on optimizing the anion-solvent interactions in ether-based electrolytes to improve the stability of both pure-SiOx anodes and LiNi0.8Mn0.1Co0.1 O2 cathodes. The optimized electrolyte enables stable cycling performance over 500 cycles in a full cell, demonstrating its practical prospects for high-energy density lithium-ion batteries.
Ether solvents with superior reductive stability promise excellent interphasial stability with high-capacity anodes while the limited oxidative resistance hinders their high-voltage operation. Extending the intrinsic electrochemical stability of ether-based electrolytes to construct stable-cycling high-energy-density lithium-ion batteries is challenging but rewarding. Herein, the anion-solvent interactions were concerned as the key point to optimize the anodic stability of the ether-based electrolytes and an optimized interphase was realized on both pure-SiOx anodes and LiNi0.8Mn0.1Co0.1O2 cathodes. Specifically, the small-anion-size LiNO3 and tetrahydrofuran with high dipole moment to dielectric constant ratio realized strengthened anion-solvent interactions, which enhance the oxidative stability of the electrolyte. The designed ether-based electrolyte enabled a stable cycling performance over 500 cycles in pure-SiOx||LiNi0.8Mn0.1Co0.1O2 full cell, demonstrating its superior practical prospects. This work provides new insight into the design of new electrolytes for emerging high-energy density lithium-ion batteries through the regulation of interactions between species in electrolytes.
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