IF 24.4 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Zezhuo Li, Yaqi Liao, Haijin Ji, Xing Lin, Ying Wei, Shuaipeng Hao, Xueting Hu, Lixia Yuan, Zhimei Huang, Yunhui Huang
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引用次数: 0

摘要

醚基电解质因其低粘度和良好的还原稳定性,在低温锂金属电池(LMB)中显示出巨大的潜力。然而,由于氧和 Li+ 之间的配位性很强,具有多叉螯合位点的传统醚类电解质存在氧化稳定性低和脱溶能障高的问题。在此,我们设计了具有未识别位点的环状四氢吡喃(THP)作为溶剂,氟碳酸乙烯酯(FEC)和硝酸锂(LiNO3)作为低温 LMB 的添加剂。循环应变和非识别螯合效应赋予 THP 对 Li+ 离子的弱亲和力,从而加速了 Li+ 的解溶解过程,并在低温下诱导了阴离子衍生电极/电解质界面。形成的富无机界面进一步提高了氧化稳定性,并加快了界面离子的传输。因此,组装好的锂-镍-锰-0.8Mn0.1Co0.1O2 (NMC811) 电池在 -40 °C 和 4.5 V 电压下稳定循环 100 次后,容量保持率为 87%。能量密度为 403 Wh kg-1 的 2.7 Ah 锂-NMC811 袋装电池在 -50 °C 时可提供 53% 的室温容量。这项工作揭示了调节溶剂的螯合位点可以很好地优化电解质,从而实现低温 LMB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A Tetrahydropyran-Based Weakly Solvating Electrolyte for Low-Temperature and High-Voltage Lithium Metal Batteries

A Tetrahydropyran-Based Weakly Solvating Electrolyte for Low-Temperature and High-Voltage Lithium Metal Batteries
Ether-based electrolytes show great potential in low-temperature lithium metal batteries (LMBs) for their low viscosity and decent reduction stability. However, conventional ethers with multidentate chelate sites suffer from low oxidation stability and high desolvation energy barrier due to the strong coordination between oxygen and Li+. Herein, cyclic tetrahydropyran (THP) with a unidentate site is designed as a solvent, and fluoroethylene carbonate (FEC) and lithium nitrate (LiNO3) serve as additives for low-temperature LMBs. The cyclic strain and unidentate chelate effect endow THP with a weak affinity to Li+ ions, which accelerates Li+ desolvation process and induces the anion-derived electrode/electrolyte interface at low temperature. The formed inorganic-rich interface further improves the oxidation stability and expedites the interfacial ion transportation. As a result, the assembled Li-LiNi0.8Mn0.1Co0.1O2 (NMC811) cell stably cycles with 87% capacity retention after 100 cycles at −40 °C and 4.5 V. The 2.7 Ah Li-NMC811 pouch cell with an energy density of 403 Wh kg−1 delivers 53% of the room-temperature capacity at −50 °C. This work reveals that regulating the chelate site of solvents can well optimize the electrolytes to realize low-temperature LMBs.
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来源期刊
Advanced Energy Materials
Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
41.90
自引率
4.00%
发文量
889
审稿时长
1.4 months
期刊介绍: Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.
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