Solid-Solid Interfacial Chemistry in Energy Storage and Conversion Systems

能量存储和转换系统中的固-固界面化学

• 批准号: RGPIN-2019-05540
• 负责人: Sang, Lingzi
• 金额: $ 1.75万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748079
• 关键词: Solid; Interfacial; Chemistry; Energy; Storage

The substantial growth of energy demand requires safe, large scale, and sustainable future energy conversion and storage devices, which are often made of solid materials. Poorly defined interfacial chemistries are likely the origins that hinder the performance and lifetime of these devices. This proposal addresses the fundamental processes at interfaces of the next-generation energy devices-all-solid sodium-ion batteries and perovskite solar cells. We combine electrochemistry with multi-disciplinary spectroscopic and microscopic analysis to interrogate chemistry occurring at electrode and solid-electrolyte (or Perovskite) interface, particularly during device operation. Perturbations allow for explicit interpretation of interfacial chemical identity at different stages of device operation. The long-term objective is a thorough understanding of the structure-property relationship at the solid-solid electrochemical interfaces, and ultimately combine material synthesis and processing to enable optimized interfacial design for promoted device performances. We initiate this research program by developing in-situ measurement tools to realize two short-term objectives. 1. Control the electrode/electrolyte interface for All-solid Sodium Battery (ASSB). ASSB utilize abundant resources and improve battery safety. Degradation at the solid electrolyte (SE) and electrode interface hinders the battery cycle life. The identity and transformation of the SE/electrode interface during cycling remain elusive. We will investigate the (chemical and mechanical) stabilities of sodium thiophosphate solid Na-ion conductor- a potential solid electrolyte material for ASSB-at the electrode surfaces during battery operation. This work will reveal the mechanisms of interfacial decomposition that associated with battery shorting and capacity fade. These implications will guide the molecular design of stable SEs or interfacial protection materials, and shed light on interfacial engineering protocols. 2 Understand Hysteresis of Perovskite Solar Cell (PSC). Perovskite solar cells show outstanding energy conversion efficiencies. Structural origins of device hysteresis remain unclear. Device stabilization is highly desired. We will implement our expertise in in-situ interfacial characterization and interrogate the two potential reasons for the device hysteresis: (1) interfacial charge trapping due to Perovskite/oxide interaction and built-in potentials, and (2) ion mobility in Perovskite structure under electrical potential. Results will provide insights into the material and interface design for high-performance PSCs with excellent stability. The in-situ interfacial measurement methods developed in this program will serve as a transportable platform to study other next-generation energy devices such as high energy solid state batteries (multivalent batteries), lead-free PSCs, and other emerging energy storage and conversion systems.

能源需求的实质性增长需要安全的能量转换和存储设备，并在下一代能量设备的界面上汇总基本过程 - 在电极和rolyte（或钙钛矿）界面，尤其是设备的操作上，构图分析。 ，最终结合材料的合成和处理以实现优化的界面设备性能。甲级电池（ASSB）使用丰富的资源并改善LE寿命。电解质材料 - 在电极表面上，与电池短路和capace褪色相关的界面分解机制将指导稳定的SES或界面保护材料的分子设计，并在界面工程方案上发光太阳能电池（PSC）。 （2）在电势下钙钛矿结构中的离子迁移率。免费PSC，以及其他弹性存储和转换系统。