通过离子偶极相互作用调节界面溶解,实现低温高电压锂电池

IF 16.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ping Liang, Jinhan Li, Yang Dong, Zhaodong Wang, Guoyu Ding, Kuiming Liu, Linlin Xue, Prof. Fangyi Cheng
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引用次数: 0

摘要

提高醚溶剂的稳定性对于开发低温高电压锂电池至关重要。在此,我们阐明了四氢呋喃与三元 BF4、PF6 和二氟硼酸(草酸)阴离子的氧化行为以及界面溶解环境的演变。结合原位分析和计算结果表明,离子偶极相互作用以及随后在电解质中形成的醚-Li+-阴离子复合物重新排列了溶解物种的氧化顺序,从而增强了醚溶剂的电化学稳定性。此外,高压阴极表面优先吸收阴离子有利于形成溶剂缺乏的电双层和抗氧化阴极电解质间相,从而抑制四氢呋喃的分解。值得注意的是,基于三元阴离子和四氢呋喃溶剂的配制电解质赋予了镍钴锰酸锂阴极 5.0 C 的可观速率能力和 200 次循环后 93.12% 的高容量保持率。充电电压为 4.5 V 时,镍钴锰酸锂电池在 25 和 -30 °C 温度下的库仑效率均超过 99%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Modulating Interfacial Solvation via Ion Dipole Interactions for Low-Temperature and High-Voltage Lithium Batteries

Modulating Interfacial Solvation via Ion Dipole Interactions for Low-Temperature and High-Voltage Lithium Batteries

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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来源期刊
CiteScore
26.60
自引率
6.60%
发文量
3549
审稿时长
1.5 months
期刊介绍: Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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