四氢呋喃
电解质
电化学
溶剂化
法拉第效率
锂(药物)
化学
溶剂
乙醚
无机化学
阴极
三元运算
物理化学
有机化学
电极
医学
内分泌学
计算机科学
程序设计语言
作者
Fangyi Cheng,Ping Liang,Jinhan Li,Dong Yang,Zhaodong Wang,Guoyu Ding,Kuiming Liu,Linlin Xue
标识
DOI:10.1002/anie.202415853
摘要
Extending the stability of ether solvents is pivotal for developing low‐temperature and high‐voltage lithium batteries. Herein, we elucidate the oxidation behavior of tetrahydrofuran with ternary BF4‐, PF6‐ and difluoro(oxalato)borate anions and the evolution of interfacial solvation environment. Combined in‐situ analyses and computations illustrate that the ion dipole interactions and the subsequent formation of ether‐Li+‐anion complexes in electrolyte rearrange the oxidation order of solvated species, which enhances the electrochemical stability of ether solvent. Furthermore, preferential absorption of anions on the surface of high‐voltage cathode favors the formation of a solvent‐deficient electric double layer and an anti‐oxidation cathode electrolyte interphase, inhibiting the decomposition of tetrahydrofuran. Remarkably, the formulated electrolyte based on ternary anion and tetrahydrofuran solvent endows the LiNi0.8Co0.1Mn0.1O2 cathode with considerable rate capability of 5.0 C and high capacity retention of 93.12% after 200 cycles. At a charging voltage of 4.5 V, the Li||LiNi0.8Co0.1Mn0.1O2 cells deliver Coulombic efficiency above 99% at both 25 and ‐30 °C.
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