Electrochemical performance of LiFePO4 cathode with dinitrile-based electrolytes
| Autor: | Jing-Heng Lin, 林敬衡 |
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| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 In this thesis, high-voltage nitrile-based electrolytes for lithium ion batteries were investigated. The electrolytes were composed of nitrile, dinitrile, and vinylene carbonate (VC) as an additive. Scanning electron microscopy showed the change of surface morphology of electrodes. The chemical compositions of the solid electrolyte interface were characterized by high resolution X-ray photo electron spectroscopy (HR-XPS). We found that the optimal ratio of dinitrile to nitrile is 6 to 4 by volume in terms of electrochemical performances. 5wt% VC as the additive has the enhanced electrochemical performances. The oxidation potential of the nitrile-based electrolytes can reach to 5.7 V. The discharge capacity of the Li||LiFePO4 cell with the nitrile-based electrolyte is about 80 mAhg-1 at a charge/discharge rate of 5 C under 30 oC, and its discharge efficiency after 100 cycles still keeps 94.35%. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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