Synthesis and electrochemical characterization of lithium vanadium phosphate
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2004.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/32730 |
| _version_ | 1811089446683017216 |
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| author | Hsiung, Chwan Hai H. (Chwan Hai Harold), 1982- |
| author2 | Donald R. Sadoway. |
| author_facet | Donald R. Sadoway. Hsiung, Chwan Hai H. (Chwan Hai Harold), 1982- |
| author_sort | Hsiung, Chwan Hai H. (Chwan Hai Harold), 1982- |
| collection | MIT |
| description | Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2004. |
| first_indexed | 2024-09-23T14:19:19Z |
| format | Thesis |
| id | mit-1721.1/32730 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T14:19:19Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/327302019-04-12T09:08:56Z Synthesis and electrochemical characterization of lithium vanadium phosphate Hsiung, Chwan Hai H. (Chwan Hai Harold), 1982- Donald R. Sadoway. Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. Materials Science and Engineering. Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2004. Includes bibliographical references (leaf 41). In a world where the miniaturization and the portability of electronic devices is king, batteries play an ever-increasingly important role. They are vital components in many consumer electronics such as cell phones and PDAs, in medical devices, and in novel applications, such as unmanned vehicles and hybrids. As the power demands of these devices increases, battery performance must improve accordingly. This thesis is an introductory investigation into the electrochemical properties of a promising new battery cathode material: lithium vanadium phosphate (Li3V2(PO4)3) (LVP). Studies of other members of the phospho-olivine family, which LVP is a part of, indicate that the olivines have high lithium diffusivity but low electronic conductivity. LVP is part of the phosphor- olivine family, which traditionally has been shown to have high lithium diffusivity but low electronic conductivity. LVP was synthesized via a solid-state reaction and cast into composite cathodes. (90/5/5 ratio of LVP, Super P Carbon, and PVDF.) These composite cathodes were used in lithium anode, LiPF6 liquid electrolyte, Swage-type cells that were galvanostatically cycled from 3.OV to 4.2V and from 3.4V to 4.8V at C/20 rates. Electrochemical impedance spectroscopy was carried out on an LVP / liquid electrolyte / LVP cells from 0.01Hz to 1MHz. Finally, temperature conductivity measurements were taken from a die-pressed LVP bar. The results of the experimentation indicate that LVP has much promise as a new battery cathode material, but there are still a number of concerns to address. (cont.) LVP has a higher operating voltage (4.78V) than the current Li-ion battery standard (3.6V), but there are issues with becoming amorphous, cycleability, and active material accessibility. From the EIS data, passivating films on the surface of the LVP cathode do not seem to be a factor in limiting performance. The conductivity data gives a higher than expected conductivity (4.62* 10-4 S/cm). by Chwan Hai H. Hsiung. S.B. 2006-05-15T20:25:57Z 2006-05-15T20:25:57Z 2004 2004 Thesis http://hdl.handle.net/1721.1/32730 56518423 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 41 leaves 2494839 bytes 2493201 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Materials Science and Engineering. Hsiung, Chwan Hai H. (Chwan Hai Harold), 1982- Synthesis and electrochemical characterization of lithium vanadium phosphate |
| title | Synthesis and electrochemical characterization of lithium vanadium phosphate |
| title_full | Synthesis and electrochemical characterization of lithium vanadium phosphate |
| title_fullStr | Synthesis and electrochemical characterization of lithium vanadium phosphate |
| title_full_unstemmed | Synthesis and electrochemical characterization of lithium vanadium phosphate |
| title_short | Synthesis and electrochemical characterization of lithium vanadium phosphate |
| title_sort | synthesis and electrochemical characterization of lithium vanadium phosphate |
| topic | Materials Science and Engineering. |
| url | http://hdl.handle.net/1721.1/32730 |
| work_keys_str_mv | AT hsiungchwanhaihchwanhaiharold1982 synthesisandelectrochemicalcharacterizationoflithiumvanadiumphosphate |