RII Track-4:NSF: Rational Design and Engineering of Composite Electrolytes for All-solid-state Li-S Batteries

RII Track-4：NSF：全固态锂硫电池复合电解质的合理设计与工程

• 批准号: 2229305
• 负责人: Shuya Wei
• 金额: $ 20.24万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-02-01 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2229305&HistoricalAwards=false
• 关键词: RII; Track; NSF; Rational; Design

High-energy and cost-effective electrical energy storage technologies are in great demand in sectors ranging from portable devices to transportation. Rechargeable lithium-sulfur (Li-S) batteries offers great promise for reversibly storing large amounts of electrical energy at moderate cost. However, Li-S batteries belie multiple challenges stemming from the complicated solution phase reaction of sulfur and poor transport of electrons and ions across the interfaces of the battery, resulting in a low capacity and poor cycle life. The main objective of this project is to develop composite solid electrolytes to realize all-solid-state Li-S batteries with high capacity and long lifetime. The project will study the science that governs the stability of electrode-electrolyte interfaces in all-solid-state Li-S batteries. By patterning with researchers from Idaho National Laboratory (INL), the PI will develop the capability to study ion transport across multiple interfaces in the solid-state Li-S battery in a more realistic pouch cell configuration by using the state-of-art operando spectroscopies. It is expected that the collaboration resulting from this fellowship will foster engagement of students at the University of New Mexico (UNM) with those at INL and expand and strength the research capability in electrochemical energy storage and conversion in the jurisdiction.This Research Infrastructure Improvement Track-4 EPSCoR Research Fellows (RII Track-4) project would provide a fellowship to an Assistant Professor and training for a graduate student at the University of New Mexico (UNM). Li-S batteries provide an attractive high theoretical energy density that is ten times higher than that of Li-ion batteries. However, polysulfide dissolution and resulting shuttling reaction of sulfur species in liquid electrolytes hinder the practical application of this cell chemistry. Solid-state electrolytes are needed to control the sluggish reactions in Li-S batteries, but they tend to create high interfacial resistance at the electrode-electrolyte interfaces, limiting the capacity and cycle life of the batteries. This project will systematically investigate the interfacial stability of both cathode and anode electrolyte interfaces in all-solid-state Li-S batteries with the composite electrolytes. Composite electrolyte based on ceramics fillers and ion-conducting polymers will be fabricated with tunable stiffness and elasticity in order to stabilize the interfaces and reduce the interfacial resistance in the Li-S battery. Advanced material and electrochemical characterizations will be employed to study composition-structural-property relationships of the interfaces of the composite electrolyte before and after battery cycling. The project will provide fundamental knowledge of ion-conduction mechanism across different solid-solid interfaces, electrochemical reaction and mechanical properties at electrode-electrolyte interfaces in both all-solid-state Li-S coin cells and pouch cells. The obtained knowledge will provide guidance on interface design to reduce interfacial resistance and realize high performance all-solid-state Li-S batteries. This fellowship will strengthen the PI’s research profile, by expanding pouch cell fabrication and advanced in-situ characterization facilities at UNM and continuing to collaborate with INL via student internship and joint journal publications.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.

从便携式设备到交通运输等领域，对高能量和高性价比的电能储存技术的需求很大。可充电的锂硫电池(锂-S)在以适中的成本可逆地储存大量电能方面有着巨大的前景。然而，锂-S电池面临着多重挑战，这是因为硫的溶液相反应复杂，电子和离子在电池界面上的传输不佳，导致容量低和循环寿命差。本项目的主要目标是开发复合固体电解质，实现大容量、长寿命的全固态锂S电池。该项目将研究管理全固态锂S电池电极-电解液界面稳定性的科学。通过与爱达荷州国家实验室(INL)的研究人员一起进行构图，PI将开发使用最先进的Operando光谱在更逼真的袋状电池配置中研究固态Li-S电池中多个界面上的离子传输的能力。预计这一奖学金产生的合作将促进新墨西哥大学(UNM)学生与INL学生的接触，并扩大和加强该司法管辖区在电化学能量储存和转换方面的研究能力。这一研究基础设施改善Track-4 EPSCoR研究人员(RII Track-4)项目将为新墨西哥大学(UNM)的一名助理教授提供奖学金，并为一名研究生提供培训。锂S电池提供了诱人的高理论能量密度，是锂离子电池的十倍。然而，多硫化物的溶解和硫物种在液体电解液中的穿梭反应阻碍了这种电池化学的实际应用。控制锂-S电池反应迟滞需要使用固态电解液，但它们往往会在电极-电解液界面产生较高的界面电阻，从而限制了电池的容量和循环寿命。本项目将系统地研究复合电解液对全固态锂S电池正负极电解液界面稳定性的影响。为了稳定锂-S电池中的界面，降低界面电阻，将陶瓷填料和离子导电聚合物制成刚性和弹性可调的复合电解液。先进的材料和电化学表征将被用来研究电池循环前后复合电解液界面的组成-结构-性能关系。该项目将提供关于全固态Li-S硬币电池和邮袋电池中不同固体-固体界面上的离子传导机制、电化学反应和电极-电解液界面上的机械性能的基础知识。所获得的知识将为降低界面电阻、实现高性能全固态锂S电池的界面设计提供指导。这项奖学金将通过在UNM扩大邮袋细胞制造和先进的现场表征设施，并通过学生实习和联合期刊出版继续与INL合作，加强PI的研究形象。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。