CAREER: Understanding Chemical, Structural and Redox Properties of Disordered Metal Oxides

职业：了解无序金属氧化物的化学、结构和氧化还原性质

• 批准号: 2045570
• 负责人: Feng Lin
• 金额: $ 60.44万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-04-01 至 2026-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2045570&HistoricalAwards=false
• 关键词: CAREER; Understanding; Chemical; Structural; Redox

Non-Technical SummaryThis CAREER project, supported by the Solid State and Materials Chemistry Program in the Division of Materials Research, advances fundamental insights into eventually designing higher energy, higher power, and more stable rechargeable batteries to meet the demand of the rapid-growing electric vehicle and energy storage market. Energy storage is a vital technology to enable the widespread adoption of renewable energy and to accelerate the technological advancement towards negative CO2 emission. The Li ion battery technology represents one of the most important energy storage technologies. Further development of Li ion batteries calls for more fundamental studies that can reveal reaction mechanisms and inform the design of new materials. Despite many years of materials development, most commercial Li-ion batteries still rely on several cathode materials that are derived from intercalation materials discovered in the 1980s. In these conventional materials, there are defined pathways for Li ions to transport. Recently, there have been exciting discoveries in new battery materials with disordered Li ion transport pathways. Unfortunately, these materials exhibit inferior battery performance compared to conventional materials, although theoretically they should provide much higher capacity. This project uses advanced experimental methods to develop fundamental understanding of electrochemical processes in these new disordered materials. The successful outcome of this project will establish a knowledge base for further improving these materials. This project also seamlessly integrates research with educating the future workforce for the United States. It provides learning opportunities for elementary students with dyslexia in Southwest Virginia. Dyslexic students, an underrepresented group in STEM fields, can be enormous intellectual assets as history, for example in the field of battery research, has taught us. Separately from this effort, the CAREER project also establishes a sustainable educational program between Virginia Tech and national labs, allowing undergraduate students to perform research in national labs. Overall, through this CAREER project Prof. Lin educates several underrepresented minority students, helping them to excel at performing scientific research and to become future leaders in the energy storage field.Technical SummaryThis CAREER project, supported by the Solid State and Materials Chemistry Program in the Division of Materials Research, investigates the structure-property relationship for an emerging family of advanced battery materials. The hypothesis underlying the various research objectives of this project is that Li-rich disordered rocksalt oxides, with a globally disordered Li percolating network and combined cationic/anionic redox activities, can potentially increase battery energy density far beyond what is delivered by conventional layered cathodes. However, so far their irreversible chemical and structural transformations during electrochemical cycling have impeded their practical applications. Prof. Lin and his research group carry out holistic fundamental studies to understand how the chemical, structural, and redox properties transform at multiple length and time scales, during materials synthesis and under electrochemical operating conditions in order to resolve these daunting challenges. The project employs experimental methods, including synchrotron X-ray techniques and electrochemical diagnostics, to accomplish the following objectives: (1) probing and controlling the evolution of local coordination environment and global average phase during mechanosynthesis, (2) investigating the redox chemistry as a function of chemical composition, local coordination environment, global phase characteristics, and electrochemistry, and (3) quantifying the multiscale evolution of local coordination environment, global average phase, and redox chemistry upon prolonged electrochemical cycling. Taken together, results from these studies provide mechanistic insights into and advance the electrochemistry of disordered rocksalt oxide.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.

非技术摘要这个职业项目得到了材料研究部固态和材料化学项目的支持，推进了最终设计更高能量、更高功率和更稳定的可充电电池的基本见解，以满足快速增长的电力需求。汽车和储能市场。储能是实现可再生能源广泛采用并加速实现二氧化碳负排放的技术进步的重要技术。锂离子电池技术是最重要的储能技术之一。锂离子电池的进一步发展需要更多的基础研究，以揭示反应机制并为新材料的设计提供信息。尽管经过多年的材料开发，大多数商用锂离子电池仍然依赖于几种源自 20 世纪 80 年代发现的插层材料的阴极材料。在这些传统材料中，有明确的锂离子传输路径。最近，在具有无序锂离子传输途径的新型电池材料方面出现了令人兴奋的发现。不幸的是，尽管理论上它们应该提供更高的容量，但与传统材料相比，这些材料的电池性能较差。该项目使用先进的实验方法来加深对这些新型无序材料电化学过程的基本了解。该项目的成功成果将为进一步改进这些材料建立知识库。该项目还将研究与教育美国未来劳动力无缝结合起来。它为弗吉尼亚州西南部患有阅读障碍的小学生提供学习机会。阅读障碍学生是 STEM 领域代表性不足的群体，正如历史（例如电池研究领域）告诉我们的那样，他们可以成为巨大的智力资产。除此之外，职业项目还在弗吉尼亚理工大学和国家实验室之间建立了一个可持续的教育计划，允许本科生在国家实验室进行研究。总体而言，通过这个职业项目，林教授教育了几名代表性不足的少数族裔学生，帮助他们在科学研究方面表现出色，并成为能源存储领域未来的领导者。技术摘要这个职业项目得到了固体与材料化学项目的支持材料研究部研究新兴先进电池材料家族的结构-性能关系。该项目各种研究目标的假设是，富含锂的无序岩盐氧化物具有全局无序的锂渗透网络和组合的阳离子/阴离子氧化还原活性，可以潜在地提高电池能量密度，远远超出传统层状阴极所提供的能量密度。然而，到目前为止，它们在电化学循环过程中不可逆的化学和结构转变阻碍了它们的实际应用。林教授和他的研究小组进行了全面的基础研究，以了解在材料合成过程中和电化学操作条件下，化学、结构和氧化还原性质如何在多个长度和时间尺度上发生转变，以解决这些艰巨的挑战。该项目采用同步加速器X射线技术和电化学诊断等实验方法来实现以下目标：（1）探测和控制机械合成过程中局部配位环境和全局平均相的演变，（2）研究氧化还原化学作为化学成分、局部配位环境、全局相特征和电化学的函数，以及（3）量化局部配位环境、全局平均相和氧化还原化学在长期电化学循环过程中的多尺度演化。总而言之，这些研究的结果为无序岩盐氧化物的电化学提供了机理见解，并促进了其发展。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值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

Reversible Mn/Cr dual redox in cation-disordered Li-excess cathode materials for stable lithium ion batteries

• DOI: 10.1016/j.actamat.2021.116935
• 发表时间: 2021-05
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: Xuerong Zheng;Zhengrui Xu;Shaofeng Li;Yuxin Zhang;Jinfeng Zhang;C. Kuai;L. Tao;Muhammad Mominur Rahman-Muha

Rechargeable Manganese Dioxide||Hard Carbon Lithium Batteries in an Ether Electrolyte

• DOI: 10.1149/1945-7111/ad3415
• 发表时间: 2024-03-31
• 期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
• 影响因子: 3.9
• 作者: Xia，Dawei;Rosenberg，Keith;Lin，Feng
• 通讯作者: Lin，Feng

A Comparative Study of Degradation Behaviors of LiFePO 4 , LiMn 2 O 4 , and LiNi 0.8 Mn 0.1 Co 0.1 O 2 in Different Aqueous Electrolytes

LiFePO 4 、LiMn 2 O 4 和LiNi 0.8 Mn 0.1 Co 0.1 O 2 在不同水电解质中降解行为的比较研究

• DOI: 10.1149/1945-7111/ad24c0
• 发表时间: 2024
• 期刊: Journal of The Electrochemical Society
• 影响因子: 3.9
• 作者: Zhang, Yuxin;Hu, Anyang;Hou, Dong;Kwon, Gihan;Xia, Dawei;Li, Luxi;Lin, Feng
• 通讯作者: Lin, Feng

Investigating Particle Size‐Dependent Redox Kinetics and Charge Distribution in Disordered Rocksalt Cathodes

• DOI: 10.1002/adfm.202110502
• 发表时间: 2022-02
• 期刊: Advanced Functional Materials
• 影响因子: 19
• 作者: Yuxin Zhang;Anyang Hu;Jue Liu;Zhengrui Xu;Linqin Mu;Sami Sainio;D. Nordlund;Luxi Li;Cheng-Jun Sun;Xianghui Xiao;Yijin Liu;Feng Lin