Insights into Anion‐Solvent Interactions to Boost Stable Operation of Ether‐Based Electrolytes in Pure‐SiO<sub>x</sub>||LiNi<sub>0.8</sub>Mn<sub>0.1</sub>Co<sub>0.1</sub>O<sub>2</sub> Full Cells
Yifan Tian, Shuang‐Jie Tan, Zhuo‐Ya Lu, Di‐Xin Xu, Hanxian Chen, Chaohui Zhang, Xusheng Zhang, Ge Li, Yuming Zhao, Wan‐Ping Chen, Quan Xu, Rui Wen, Juan Zhang, Yu‐Guo Guo
Abstract
Abstract 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‐SiO x anodes and LiNi 0.8 Mn 0.1 Co 0.1 O 2 cathodes. Specifically, the small‐anion‐size LiNO 3 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‐SiO x ||LiNi 0.8 Mn 0.1 Co 0.1 O 2 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.