CAREER: Dynamic Phenomena in Complex Oxides During Electrochemical Processes

职业：电化学过程中复杂氧化物的动态现象

• 批准号: 1057170
• 负责人: Ying Meng
• 金额: $ 45万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1057170&HistoricalAwards=false
• 关键词: CAREER; Dynamic; Phenomena; Complex; Oxides

NON-TECHNICAL DESCRIPTION: Energy storage is the enabling key to the environmentally-friendly transportation and the economic deployment of renewable energy sources. All electrochemical energy storage and conversion materials function as 'living' systems (batteries, pseudocapacitors and fuel cells), within which electrons and ions are moving during charge and discharge. These electronic and ionic motions often trigger defect generation and phase transformations, and consequently result in significant changes in energy density and rate capability of the materials. Establishing the fundamental basis for these dynamical mechanisms during electrochemical processes will accelerate the creation of new synthetic materials with superior energy storage and conversion properties. TECHNICAL DETAILS: This research targets the systematic synthesis, structural characterization and properties evaluation of a series of transition metal oxides xA2MnO3(1-x)Ay(NiMn)O2 (A=Li+, Na+ the mobile species) that are capable of storing energy reversibly. These oxides have intriguing and complex features including nanometer-scale phase separation upon cycling and dynamic cation redistribution at various state of charge, that significantly affect the mobility of the guest species. The reduction-oxidation processes that occur upon releasing the guest species, not only may alter the cation distributions, but also modify the solid-solid interfaces within the material, which are critical to the transport properties as well as the structural stability of the electrodes. The developed framework can be applied as the basis for controlling the dynamic phenomena in solid-state materials for energy storage; such knowledge is critical and transformational to design and develop new materials that will allow higher and faster energy storage and longer lifetime in electrochemical energy storage and conversion systems. The broader impacts of this grant are integrated with the research objectives. The PI's education efforts include a). Vertically integrating precollegiate, undergraduate and graduate education and training through tools, practical examples and hands-on laboratory experiences b). Fostering a strong awareness and appreciation for diversity of cultural and educational backgrounds and experience and research approaches among the students to directly impact the diversity on UCSD campus, and c). Engaging in teaching and research in an international science and engineering environment, including organizing an annual international workshop and research-focused exchange program.

非技术描述：储能是环保运输和可再生能源经济部署的关键。所有电化学能量存储和转换材料都充当“生命”系统（电池、赝电容器和燃料电池），电子和离子在充电和放电过程中在其中移动。这些电子和离子运动通常会引发缺陷产生和相变，从而导致材料的能量密度和倍率能力发生显着变化。为电化学过程中的这些动力学机制奠定基础将加速具有优异能量存储和转换特性的新型合成材料的创造。技术细节：本研究的目标是系统合成、结构表征和性能评估一系列能够可逆储存能量的过渡金属氧化物xA2MnO3(1-x)Ay(NiMn)O2（A=Li+，Na+移动物种） 。这些氧化物具有有趣且复杂的特征，包括循环时的纳米级相分离以及各种电荷状态下的动态阳离子重新分布，这显着影响客体物质的迁移率。释放客体物质时发生的还原-氧化过程不仅可以改变阳离子分布，还可以改变材料内的固-固界面，这对于电极的传输性能和结构稳定性至关重要。所开发的框架可作为控制固态储能材料动态现象的基础；这些知识对于设计和开发新材料至关重要且具有变革性，这些新材料将允许电化学能量存储和转换系统实现更高、更快的能量存储和更长的使用寿命。这笔赠款的更广泛影响与研究目标相结合。 PI 的教育工作包括 a)。通过工具、实际例子和实验室实践经验垂直整合大学预科、本科生和研究生教育和培训 b).培养学生对文化和教育背景、经验和研究方法多样性的强烈认识和欣赏，以直接影响加州大学圣地亚哥分校校园的多样性，以及c)。在国际科学和工程环境中从事教学和研究，包括组织年度国际研讨会和以研究为重点的交流计划。