偶极-偶极相互作用诱导电解质界面模型稳定高安全锂离子电池的锑阳极,ACS Energy Letters

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偶极-偶极相互作用诱导电解质界面模型稳定高安全锂离子电池的锑阳极
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-09-26 , DOI: 10.1021/acsenergylett.2c01408
Qujiang Sun ₁ , Zhen Cao ₂ , Zheng Ma ₃ , Junli Zhang ₁ , Haoran Cheng _{3,

4} , Xianrong Guo ₂ , Geon-Tae Park ₅ , Qian Li ₃ , Erqing Xie ₁ , Luigi Cavallo ₂ , Yang-Kook Sun ₅ , Jun Ming _{3,

4}

Affiliation

电解质在决定电池性能方面起着至关重要的作用，而溶剂分子相互作用对电极性能的影响尚不完全清楚。在这里，我们提出了一种未揭示的偶极-偶极相互作用，以展示溶剂相互作用对稳定电解质以获得高电极性能的作用机制。作为范例，一种新的不可燃磷酸三乙酯 (TEP) 基电解质被设计用于稳定块状合金阳极（例如 Sb），其中根据由 TEP 和之间的偶极 - 偶极相互作用引起的溶剂化结构构建界面模型必需的 1,1,2,2-四氟乙基-2,2,3,3-四氟丙基醚 (HFE)。我们证明了 Li ⁺源自不同溶剂化结构的-溶剂-阴离子络合物表现出不同的动力学和电化学性质，导致不同电解质中的 Sb 阳极性能不同。结果，实现了 656 mAh g ^{-1的高锂存储容量、超过 4 A g}^-1的稳健倍率容量和超过 100 次循环的长寿命，优于之前报道的那些。这项工作为理解电解质对电极性能的影响提供了不同的见解，并为电解质设计提供了指导，以稳定金属离子电池中的合金阳极及其他材料。

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Dipole–Dipole Interaction Induced Electrolyte Interfacial Model To Stabilize Antimony Anode for High-Safety Lithium-Ion Batteries

Electrolyte plays a vital role in determining battery performances, while the effect of solvent molecular interaction on electrode performances is not fully understood yet. Herein, we present an unrevealed dipole–dipole interaction to show the mechanism of solvent interaction effect on stabilizing the electrolyte for high electrode performances. As a paradigm, a new nonflammable triethyl phosphate (TEP)-based electrolyte is designed to stabilize the bulk alloying anode (e.g., Sb), where an interfacial model is constructed according to the solvation structure induced by the dipole–dipole interaction between TEP and the essential 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (HFE). We demonstrate that the Li⁺–solvent–anion complexes derived from different solvation structures exhibit different kinetic and electrochemical properties, contributing to varied Sb anode performances in different electrolytes. As a result, a high lithium storage capacity of 656 mAh g^–1, robust rate capacities over 4 A g^–1, and a long lifespan of more than 100 cycles are achieved, which are better than those reported before. This work presents a different insight into understanding electrolyte effects on electrode performances and provides a guideline for electrolyte design to stabilize alloying anodes and beyond in metal-ion batteries.

更新日期：2022-09-26

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