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.

至关重要的是，需要改善电动汽车的能源储能技术，并大规模整合可再生电网存储以改善国内能源安全。当前，诸如锂离子电池之类的最先进的储能技术不足以提供所需的性能要求，例如成本和能量密度以实现广泛使用。使用高能密度电极的电池化学物质可以为这些应用提供途径，以提高能量密度和耐用性。该项目介绍了将锂硫电池用作潜在的高能量密度和较低的成本选择。锂硫电池的主要限制是它们的循环稳定性不佳，即反复使用后能量衰减。这种衰减的原因之一是反应中间体称为锂多硫化物，它们溶解并迁移到电池电解质中，导致活性材料损失。该项目通过共同的实验和理论方法来解决该问题，以开发新材料，不仅可以限制锂多硫化物，而且可以加速其转换以存储或释放能量。这些材料有可能在不损害其能量密度的情况下延长锂硫电池的寿命。该项目还通过耶鲁大学通往科学课程的途径进行宣传，涉及中学和高中的大学学生。调查人员将在该计划下为涉及电池主题的夏季研讨会启用一项新的外展活动。这是一个基本的工程项目，通过合理设计基于对化学相互作用的分子级别的理解和电极界面的分子理解，通过合理设计高性能硫电话来应对锂硫硫硫次电池面临的循环生活挑战。通过在实验和计算上研究了具有无机纳米颗粒和金属复合物，具有良好的控制和系统变化的结构，对锂多硫化物的化学结合机制以及电化学氧化还原行为进行了研究。将确定可以有效地结合锂多硫化锂并催化其电化学转化反应的合适位点。将计算并检查反应途径，能屏障和限速步骤。根据新知识，将设计和合成三元结构的材料和超薄保护层，以实现在与应用程序相关的条件下运行的高容量和长周期的硫电话电极。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和广泛的影响来审查CRETIRIA的法定任务。

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