Effect of electrolyte composition on initial cycling and impedance characteristics of lithium-ion cells
| Autor: | Sun-Ho Kang, Daniel P. Abraham, M.M. Furczon, Andrew N. Jansen, Dennis W. Dees |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Inorganic chemistry Lithium tetrafluoroborate Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element Electrolyte Lithium hexafluorophosphate Reference electrode Lithium battery Electrochemical cell chemistry.chemical_compound chemistry Electrode Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Journal of Power Sources. 180:612-620 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2008.02.047 |
| Popis: | Hybrid-electric vehicles require lithium-battery electrolytes that form stable, low impedance passivation layers to protect the electrodes, while allowing rapid lithium-ion transport under high current charge/discharge pulses. In this article, we describe data acquired on cells containing LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2}-based positive electrodes, graphite-based negative electrodes, and electrolytes with lithium hexafluorophosphate (LiPF{sub 6}), lithium tetrafluoroborate (LiBF{sub 4}), lithium bis(oxalato)borate (LiBOB) and lithium difluoro(oxalato) borate (LiF{sub 2}OB) salts. The impedance data were collected in cells containing a Li-Sn reference electrode to determine effect of electrolyte composition and testing temperature on individual electrode impedance. The full cell impedance data showed the following trend: LiBOB > LiBF{sub 4} > LiF{sub 2}OB > LiPF{sub 6}. The negative electrode impedance showed a trend similar to that of the full cell; this electrode was the main contributor to impedance in the LiBOB and LiBF{sub 4} cells. The positive electrode impedance values for the LiBF{sub 4}, LiF{sub 2}OB, and LiPF{sub 6} cells were comparable; the values were somewhat higher for the LiBOB cell. Cycling and impedance data were also obtained for cells containing additions of LiBF{sub 4}, LiBOB, LiF{sub 2}OB, and vinylene carbonate (VC) to the EC:EMC (3:7 by wt.) + 1.2 M LiPF{sub 6} electrolyte. Ourmore » data indicate that the composition and morphology of the graphite SEI formed during the first lithiation cycle is an important determinant of the negative electrode impedance, and hence full cell impedance.« less |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect