Collaborative Research: Characterization of Transport Properties and Microstructures of Battery Electrolytes via In Situ Spectroscopy

合作研究：通过原位光谱表征电池电解质的传输特性和微观结构

• 批准号: 2120559
• 负责人: Tao Li
• 金额: $ 27.05万
• 依托单位: Northern Illinois University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-15 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2120559&HistoricalAwards=false
• 关键词: Collaborative; Research; Characterization; Transport; Properties

With the support from the Electrochemical Systems program in the Division of Chemical, Bioengineering, Environmental, and Transport Systems, the investigators will develop innovative in situ techniques to characterize the liquid electrolyte for rechargeable batteries. Rechargeable batteries are one of the most popular energy storage devices for electronic products, electric vehicles, and grid energy storage. The next generation of rechargeable batteries requires excellent performance in terms of fast charging and safety. This work will provide universal methods to characterize the transport property and microstructure of the electrolyte crucial to battery performance. The investigators will incorporate the battery research into their teaching curricula for undergraduate and graduate students, encourage students from underrepresented groups in STEM to participate in the research, and broaden the impact of the research through outreach activities, e.g., workshops with local school teachers on K-12 science education.The primary objectives of this work are to develop a variety of universal in situ techniques to characterize the transport property and microstructure of battery electrolytes, including in situ probe beam deflection (PBD), in situ small-angle X-ray scattering (SAXS), ohmic microscopy, and microelectrode array. Specifically, in situ PBD will be employed to measure the transference number and diffusivity in the framework of concentrated solution theory. It only requires one experiment to determine the transference number and diffusivity of the electrolyte, while traditional methods will require the combination of three or four electrochemical experiments. In situ PBD can also monitor the ionic concentration profile of the electrolyte in an operating battery. In situ SAXS will be used to characterize the microscopic structure of the concentrated electrolyte and monitor the variation of ion pairs and/or aggregates induced by the electric field. Ohmic Microscopy will be utilized to measure the conductivity and monitor the variation of electrolyte conductivity resulting from the charge separation induced by the strong electric field. A microelectrode array will be used to measure the ionic concentration and diffusivity of the electrolyte simultaneously. The other complementary techniques, including Raman spectroscopy and molecular dynamics simulation, will provide a molecular-level understanding of the correlation between the microstructure and transport property.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学，生物工程，环境和运输系统部电化学系统计划的支持下，研究人员将开发创新的原位技术，以表征可充电电池的液体电解质。可充电电池是电子产品，电动汽车和电网储能的最流行的能源存储设备之一。下一代可充电电池在快速充电和安全性方面需要出色的性能。这项工作将提供通用方法，以表征电解质对电池性能至关重要的运输属性和微观结构。调查人员将将电池研究纳入其本科生和研究生的教学课程中，鼓励来自STEM中代表性不足的群体的学生参与研究，并通过外展活动扩大研究的影响，例如，与本地学校教师与K-12的教师进行研讨探针梁挠度（PBD），原位小角度X射线散射（SAXS），欧姆显微镜和微电极阵列。具体而言，将采用原位PBD来衡量集中溶液理论框架中的转移数和扩散率。它仅需要一个实验来确定电解质的转移数和扩散率，而传统方法将需要三个或四个电化学实验的组合。原位PBD还可以监测操作电池中电解质的离子浓度谱。原位SAX将用于表征浓缩电解质的显微镜结构，并监测由电场诱导的离子对和/或聚集体的变化。欧姆显微镜将用于测量电导率并监测由强电场引起的电荷分离引起的电解度的变化。微电极阵列将同时测量电解质的离子浓度和扩散率。其他互补技术，包括拉曼光谱和分子动力学模拟，将提供对微观结构和运输特性之间相关性的分子级别的理解。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的评估来审查的审查审查的批评。

项目成果

Revealing the Correlation between the Solvation Structures and the Transport Properties of Water-in-Salt Electrolytes

• DOI: 10.1021/acs.chemmater.2c03654
• 发表时间: 2023-02
• 期刊: Chemistry of Materials
• 影响因子: 8.6
• 作者: Xinyi Liu;Shao-Chun Lee;Soenke Seifert;Lilin He;Changwoo Do;R. Winans;Gihan Kwon;Y. Z;Tao Li

Understanding fluorine-free electrolytes via small-angle X-ray scattering

• DOI: 10.1016/j.jechem.2022.02.043
• 发表时间: 2022-03
• 期刊: Journal of Energy Chemistry
• 影响因子: 13.1
• 作者: Kun Qian;Zhou Yu;Yuzi Liu;D. Gosztola;R. Winans;Lei Cheng;Tao Li