Rational Electrolyte Design for Elevated-Temperature and Thermally Stable Lithium-Ion Batteries with Nickel-Rich Cathodes

IF 8.3 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Hao Jia, Benjamin Broekhuis, Yaobin Xu, Zhijie Yang, David Kautz, Lirong Zhong, Mark H. Engelhard, Qian Zhao, Mark E. Bowden, Bethany E. Matthews, Callum Connor, Feng Lin, Chongmin Wang, Wu Xu
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Abstract

As the energy density of lithium-ion batteries (LIBs) increases, the shortened cycle life and the increased safety hazards of LIBs are drawing increasing concerns. To address such challenges, a series of localized high-concentration electrolytes (LHCEs) based on a solvating-solvent mixture of tetramethylene sulfone and trimethyl phosphate and a high flash-point diluent 1H,1H,5H-octafluoropentyl 1,1,2,2-tetrafluoroethyl ether were designed. The LHCEs exhibited nonflammability and greatly suppressed heat release at elevated temperatures, which would potentially improve the safety performance of the LIBs. Moreover, the optimal LHCE achieved capacity retentions of 87.1% and 81.7% in graphite||LiNi0.8Mn0.1Co0.1O2 cells after 500 cycles at 25 and 45 °C, respectively, which were significantly higher than the conventional electrolyte, whose capacity retentions were only 75.2% and 38.5% under the same conditions. Mechanistic studies revealed that the LHCE not only formed a more robust solid electrolyte interphase but also exhibited improved anodic stability, compared with the conventional electrolyte. This work sheds light on rational electrolyte design for high-energy density LIBs with high battery performance and low safety concerns.

Abstract Image

富镍阴极高温热稳定锂离子电池的合理电解液设计
随着锂离子电池能量密度的提高,其循环寿命的缩短和安全隐患的增加日益引起人们的关注。为了解决这些问题,设计了一系列基于四亚甲基砜和磷酸三甲酯的溶剂化溶剂混合物和高闪点稀释剂1H,1H, 5h -辛氟戊基1,1,2,2-四氟乙醚的局部化高浓度电解质(LHCEs)。lhce表现出不可燃性,并且在高温下极大地抑制了热释放,这可能会提高lib的安全性能。此外,在25°C和45°C条件下,经过500次循环后,最佳LHCE在石墨||LiNi0.8Mn0.1Co0.1O2电池中的容量保留率分别达到87.1%和81.7%,显著高于常规电解质在相同条件下的容量保留率,后者的容量保留率仅为75.2%和38.5%。机理研究表明,与传统电解质相比,LHCE不仅形成了更坚固的固体电解质界面,而且表现出更好的阳极稳定性。本研究为高电池性能、低安全隐患的高能量密度锂离子电池的合理电解液设计提供了思路。
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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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