Developing Sulfur Cathode Materials for Electrochemical Energy Storage

开发用于电化学储能的硫正极材料

• 批准号: 1903342
• 负责人: Hailiang Wang
• 金额: $ 52.24万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1903342&HistoricalAwards=false
• 关键词: Developing; Sulfur; Cathode; Materials; Electrochemical

There is a critical need for improved energy storage technologies for electric vehicles and large-scale integration of renewable electricity grid storage to improve domestic energy security. Currently, state-of-the-art energy storage technologies such as lithium ion batteries are insufficient in providing the performance requirements needed such as cost and energy density to enable broad use. Battery chemistries using high energy density electrodes could provide an avenue towards gains in energy density and durability for these applications. This project addresses the use of lithium-sulfur batteries as a potential high energy density and lower cost option. The major constraint of lithium-sulfur batteries is their poor cycling stability, namely the energy decay upon repeated use. One cause for this decay is reaction intermediates called lithium polysulfides, which dissolve and migrate in the battery electrolyte causing loss in active material. This project addresses the issue with a combined experimental and theoretical approach to develop new materials that can not only confine lithium polysulfides, but also accelerate their conversion to store or release energy. These materials have the potential to extend the life time of lithium-sulfur batteries without compromising their energy density. The project also conducts outreach through the Yale University Pathways to Science Program involving pre-college students in middle school and high school. The investigators will enable a new outreach activity under this program for a summer workshop involving battery topics.This is a fundamental engineering project that addresses the cycle life challenge facing lithium-sulfur batteries by rationally designing high-performance sulfur electrodes based on molecular-level understanding of the chemical interactions and enabling electrocatalysis at the electrode/polysulfide interface. The chemical binding mechanisms as well as the electrochemical redox behaviors of lithium polysulfides are studied both experimentally and computationally with distinct model material systems comprising inorganic nanoparticles and metal complexes with well-controlled and systematically-varied structures. Suitable sites that can effectively bind lithium polysulfides and catalyze their electrochemical conversion reactions will be identified. Reaction pathways, energy barriers and rate-limiting steps will be calculated and experimentally examined. Based on the new knowledge, ternary-structured materials and ultrathin protection layers will be designed and synthesized to enable high-capacity and long-cycle sulfur electrodes operating under application-relevant conditions.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.

迫切需要改进电动汽车储能技术和大规模整合可再生电网存储，以提高国内能源安全。目前，最先进的储能技术（例如锂离子电池）不足以满足广泛使用所需的性能要求（例如成本和能量密度）。使用高能量密度电极的电池化学物质可以为这些应用提供提高能量密度和耐用性的途径。该项目将锂硫电池作为一种潜在的高能量密度和低成本选择。锂硫电池的主要限制是其循环稳定性差，即重复使用时能量衰减。造成这种衰减的原因之一是称为多硫化锂的反应中间体，它在电池电解质中溶解和迁移，导致活性材料损失。该项目通过实验和理论相结合的方法来解决这个问题，开发新材料，不仅可以限制多硫化锂，还可以加速其转化以储存或释放能量。这些材料有可能在不影响能量密度的情况下延长锂硫电池的使用寿命。该项目还通过耶鲁大学科学之路计划开展外展活动，涉及初中和高中的大学预科学生。研究人员将在该计划下开展一项涉及电池主题的夏季研讨会的新外展活动。这是一个基础工程项目，通过基于对化学相互作用的分子级理解合理设计高性能硫电极并在电极/多硫化物界面实现电催化，解决锂硫电池面临的循环寿命挑战。通过实验和计算研究了多硫化锂的化学结合机制以及电化学氧化还原行为，并使用不同的模型材料系统进行了研究，该模型材料系统包含具有良好控制和系统变化结构的无机纳米粒子和金属络合物。将确定可以有效结合多硫化锂并催化其电化学转化反应的合适位点。反应路径、能量势垒和限速步骤将被计算和实验检查。基于新知识，将设计和合成三元结构材料和超薄保护层，以实现在应用相关条件下运行的高容量和长周期硫电极。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Metal Organic Framework Derivative Improving Lithium Metal Anode Cycling

• DOI: 10.1002/adfm.201907579
• 发表时间: 2020-01
• 期刊: Advanced Functional Materials
• 影响因子: 19
• 作者: Y. Zhong;Fang Lin;Maoyu Wang;Yifang Zhang;Q. Ma;Julia Lin;Zhenxing Feng;Hailiang Wang

Inorganic/polymer hybrid layer stabilizing anode/electrolyte interfaces in solid-state Li metal batteries

• DOI: 10.1007/s12274-020-2993-4
• 发表时间: 2020-08-25
• 期刊: NANO RESEARCH
• 影响因子: 9.9
• 作者: Hu, Yiran;Zhong, Yiren;Wang, Hailiang
• 通讯作者: Wang, Hailiang

A Highly Efficient All‐Solid‐State Lithium/Electrolyte Interface Induced by an Energetic Reaction

• DOI: 10.1002/anie.202004477
• 发表时间: 2020-06
• 期刊: Angewandte Chemie International Edition
• 作者: Y. Zhong;Yujun Xie;Sooyeon Hwang;Qian Wang;Judy J. Cha;Dong Su;Hailiang Wang

Intrinsically high efficiency sodium metal anode

• DOI: 10.1007/s11426-020-9808-6
• 发表时间: 2020-08
• 期刊: Science China Chemistry
• 作者: Yifang Zhang;Qiuwei Shi;Y. Zhong;Hailiang Wang