Mechanistic Investigation of Metal Sulfide Electrodes for High-Energy Non-Aqueous Anion Batteries

高能非水阴离子电池金属硫化物电极的机理研究

• 批准号: 2215645
• 负责人: Xiulei Ji
• 金额: $ 39.84万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2215645&HistoricalAwards=false
• 关键词: Mechanistic; Investigation; Metal; Sulfide; Electrodes; Mechanistic; Investigation; Metal; Sulfide; Electrodes

The energy density of the current Li-ion batteries has nearly reached their ceiling; however, driving range anxiety still hinders the market growth of electric vehicles. In addition, the current high-energy batteries rely on expensive elements of cobalt and nickel with poor earth abundance and in cobalt’s case not plentiful domestically. Therefore, manufacturing such batteries is not sustainable for transforming a large percentage of vehicles to be electrified to mitigate climate change. Current high-energy batteries employ Li-ions (positive charged ions) as the charge carrier to compensate for the charge neutrality of metal oxides during charge and discharge. In theory, the operation of battery electrodes can use anions (negative charged ions) as charge carriers, but this research direction has yet to receive much attention, particularly to achieve high energy density. This project will study earth abundant materials that are plentiful domestically such as copper and sulfur. This fundamental research project will fill the knowledge gap by employing light (low molecular weight) anions as the charge carriers to couple with the redox reactions of inexpensive metal sulfides as the electrode. The project will build upon the preliminary findings of the reversible storage of anions in conversion electrode reactions. In addition, the PI will study nonaqueous electrolytes to facilitate the new battery reactions. As a part of the research, the project will provide high-quality research opportunities for underserved undergraduate and high school students. The project aims to elucidate the operation mechanism of a high-energy cathode converted reversibly between Cu2S mixed with a lithium salt and the composite comprising a cupric salt, CuA2, and sulfur. The targeted Cu2S, as a natural mineral, is a promising anion-hosting cathode material because Cu2S is a conductor of both electrons and copper ions. The project will generate knowledge about the interplays and transport of three ions in a seemingly complicated conversion reaction. In the electrochemical conversion reactions between Cu2S+LiA and CuA2+S, four electrons are transferred. Li-ions never interact with redox centers of copper or sulfur but only with A-anion; however, copper ions and anions transport between the redox centers of Cu2S, CuS, and CuA2. This electrode design causes the decoupling of device charge compensation and electrode charge compensation. The outcomes of this project will be a new addition to solid-state ionics and electrochemical systems. Unlike that of the sulfur cathode in Li-S batteries, the presence of copper ions eliminates polysulfide formation due to the strong binding between copper ions and sulfides. The insoluble nature of Cu2S and CuS allows the characterization of the solid electrode at different state of charge on detailed structural and kinetic properties. The project will delineate the correlations that affect the utilization, the kinetic properties, and the reversibility of the electrodes. The project will establish synergistic selection rules of anion charge carriers and electrolytes to promote the proposed battery chemistry performance.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.

当前的锂离子电池的能量密度几乎已经到达天花板。但是，练习范围焦虑仍然阻碍电动汽车的市场增长。此外，目前的高能电池依赖于钴和镍的昂贵元素，地球丰度较差，在钴的情况下，在国内不丰富。因此，制造此类电池对于转换大部分的车辆以使气候变化的电气不可持续。当前的高能量电池员工Li-ions（带电阳性离子）作为电荷载体，以补偿电荷和放电期间金属氧化物的电荷中立性。从理论上讲，电池电极的操作可以将阴离子（负电荷离子）用作电荷载体，但是该研究方向尚未受到很多关注，尤其是为了达到高能量密度。该项目将研究地球丰富的材料，这些材料在国内，例如铜和硫。这个基本的研究项目将通过使用光（低分子量）阴离子来填补知识差距，因为电荷载体与廉价金属硫化物作为电极的氧化还原反应夫妇。该项目将基于转换电极反应中阴离子可逆存储的初步发现。此外，PI将研究非水电器以促进新的电池反应。作为研究的一部分，该项目将为服务不足的本科生和高中生提供高质量的研究机会。该项目旨在阐明高能阴极的操作机理在与锂盐混合的Cu2s之间可逆地转化，并完成铜盐，CuA2和硫的复合材料。作为天然矿物，靶向的Cu2s是一种有望的阴离子托管阴极材料，因为Cu2s是电子和铜离子的导体。该项目将在看似复杂的转化反应中产生有关三个离子的相互作用和运输的知识。在CU2S+LIA和CUA2+S之间的电化学转化反应中，转移了四个电子。锂离子从不与氧化还原中心相互作用，而仅与A-Anion相互作用。但是，铜离子和阴离子在Cu2s，CUS和CUA2的氧化还原中心之间运输。该电极设计导致设备电荷补偿和电极电荷补偿的解耦。该项目的结果将是固态离子学和电化学系统的新补充。与Li-S电池中的硫阴极不同，由于铜离子和硫化物之间的强结合，铜离子的存在消除了多硫化物的形成。 CU2S和CUS的不溶性性质允许在详细的结构和动力学特性上以不同的电荷状态表征固体电极。该项目将描述影响利用率，动力学特性和电子可逆性的相关性。该项目将建立阴离子荷载体和电解质的协同选择规则，以促进拟议的电池化学性能。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响评估标准，被认为是珍贵的支持。