| dc.identifier.uri | http://hdl.handle.net/11401/78115 | |
| dc.description.sponsorship | This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree | en_US |
| dc.format | Monograph | |
| dc.format.medium | Electronic Resource | en_US |
| dc.language.iso | en_US | |
| dc.type | Dissertation | |
| dcterms.abstract | Li-ion batteries play a significant role in energy storage. LiFePO¬4 is a popular cathode material due to a high discharge voltage and long cycle life. However, the intrinsic low conductivity limits its rate capability. In this study, a silver ion conductor, Ag7Fe3(P2O7)4, is synthesized via solid-state method and its electrochemistry is investigated for the first time. The material starts with a high ionic conductivity (7.5 x 10-6 S cm-1 at 100°C) and will form a conductive Ag metal network upon initial discharge to enhance the electrical conductivity, where both aspects facilitate the rate capability. The contrasting reduction of Ag+/Ag0 and Fe3+/Fe2+ is determined by ex-situ X-ray diffraction and Fe K-edge X-ray absorption spectroscopy. Ag metal formation during the first discharge of Ag7Fe3(P2O7)4 is monitored via operando synchrotron X-ray diffraction. The internal resistance decreases upon the initial discharge concurrent with the Ag metal formation. Another bimetallic compound, Zinc ferrite (ZnFe2O4) is also explored. The material is synthesized by the initial co-precipitation followed by a hydrothermal reaction. The fundamental electrochemical mechanisms for the first reduction and oxidation process are investigated by the combination of in-situ X-ray diffraction, ex-situ synchrotron X-ray powder diffraction and ex-situ X-ray absorption spectroscopy techniques. Electrochemical performance of 3D-Li4Ti5O12, multi-walled carbon nanotube (MWCNT)-Li4Ti5O12 composites and Ca-doped Li4Ti5O12 is investigated through several electrochemical methods. Compared with the spherical (commercial) Li4Ti5O12, 3D- Li4Ti5O12 delivers 3X higher capacity at 100 C rate. Furthermore, the effect of various MWCNT attachment modalities and different doping levels of Ca2+ cation on the resulting electrochemical rate capability performance is intensively studied. | |
| dcterms.available | 2018-03-22T22:39:00Z | |
| dcterms.contributor | Parise, John B. | en_US |
| dcterms.contributor | Takeuchi, Esther S. | en_US |
| dcterms.contributor | Mayr, Andreas | en_US |
| dcterms.contributor | Takeuchi, Kenneth J. | en_US |
| dcterms.contributor | Gan, Hong. | en_US |
| dcterms.creator | Zhang, Yiman | |
| dcterms.dateAccepted | 2018-03-22T22:39:00Z | |
| dcterms.dateSubmitted | 2018-03-22T22:39:00Z | |
| dcterms.description | Department of Chemistry. | en_US |
| dcterms.extent | 138 pg. | en_US |
| dcterms.format | Monograph | |
| dcterms.format | Application/PDF | en_US |
| dcterms.identifier | http://hdl.handle.net/11401/78115 | |
| dcterms.issued | 2017-08-01 | |
| dcterms.language | en_US | |
| dcterms.provenance | Made available in DSpace on 2018-03-22T22:39:00Z (GMT). No. of bitstreams: 1
Zhang_grad.sunysb_0771E_13451.pdf: 18562411 bytes, checksum: 02d2d61574055ab83e61f1df55f0e542 (MD5)
Previous issue date: 2017-08-01 | en |
| dcterms.subject | Lithium-ion Battery | |
| dcterms.subject | Inorganic chemistry -- Materials Science. | |
| dcterms.subject | Lithium Titanium Oxide | |
| dcterms.subject | Rietveld Refinement | |
| dcterms.subject | Silver Iron Pyrophosphate | |
| dcterms.subject | Znic Ferrite | |
| dcterms.title | Concept Driven Design, Synthesis and Characterization of Bimetallic Iron (III) Materials: Battery Relevant Electrochemistry Measurement and Interpretations | |
| dcterms.type | Dissertation | |
