Crystallography of Prussian blue analogues and its effect on electrochemistry
- Rechargeable batteries have revolutionized portable electronics and electric vehicles. Soon, they may also play an instrumental role in the integration of intermittent solar and wind resources by providing cost-effective grid-scale energy. Prussian Blue analogue (PBA) materials have demonstrated exceptional electrochemical properties that make them suitable for a variety of battery applications. However, little is understood about the specific mechanisms that enable these unique properties. In my work, I have demonstrated how the unique crystal structure of PBAs directly affects and enhances their electrochemical properties. In the first part of my dissertation, I showed that a wide variety of divalent and trivalent cations in aqueous solution can be electrochemically inserted and extracted with high speed and reversibility. I used synchrotron X-ray diffraction (XRD) to establish a novel vacancy-mediated pathway for multivalent ion conduction that could be valuable in the future development of multivalent-ion batteries. In the second part of my dissertation, I presented a PBA cathode material (manganese hexacyanomanganate) that exhibits promise as a high-capacity sodium-ion cathode in organic electrolyte. This system possessed the highest sodium-ion capacity (209 mAh/g) ever recorded, and I used synchrotron XRD to understand the structural distortions that enable this unusually high capacity. In the third part of my dissertation, I developed a framework to understand high-capacity PBA cathodes in aqueous systems. Using in situ synchrotron XRD and soft X-ray absorption spectroscopy, I investigated the complex interactions between the electronic structures of metal ions, the crystal structure, and electrochemical properties in this system. These experiments demonstrated fundamental kinetic limitations associated with electronic structure that may affect the future development of high-capacity PBA electrodes.
|Type of resource
|electronic; electronic resource; remote
|1 online resource.
|Wang, Richard Y
|Stanford University, Department of Materials Science and Engineering.
|Cui, Yi, 1976-
|Cui, Yi, 1976-
|Statement of responsibility
|Richard Y. Wang.
|Submitted to the Department of Materials Science and Engineering.
|Thesis (Ph.D.)--Stanford University, 2016.
- © 2016 by Richard Yufan Wang
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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