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  • 1
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    Improved Li/TiS2 cell cycling in ether-based electrolytes with synergistic additives (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Based on an extensive series of normalized full cell Li/TiS2 cycling studies, open-circuit storage tests, microcalorimetry and AC impedance studies, and chemical precedent, we propose an integrated chemical model consistent with experimental observations concerning the behavior of numerous LiAsF6/cyclic ether electrolytes. The particularly striking potency of certain additives such as 2-methylfuran and the hydroxide action resides in their ability to intercept several different adverse catalytic processes concurrently in the bulk electrolyte as well as the Li anode and TiS2 cathode.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: In: Primary and secondary lithium batteries (A93-37355 14-25); p. 293-301.
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    NASA TECHNICAL REPORTS
  • 2
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    Effect of cycling on the lithium/electrolyte interface in organic electrolytes (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Nondestructive methods such as ac impedance spectroscopy and microcalorimetry are used to study the effect of cell cycling on the lithium/electrolyte interface. The reactivity of both uncycled and cycled lithium towards various electrolytes is examined by measuring the heat evolved from the cells under open-circuit conditions at 25 C by microcalorimetry. Cycled cells at the end of charge/discharge exhibited considerably higher heat output compared with the uncycled cells. After 30 d of storage, the heat output of the cycled cells is similar to that of the uncycled cells. The cell internal resistance increases with cycling, and this is attributed to the degradation of the electrolyte with cycling.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Power Sources (ISSN 0378-7753); 43; 1-3; p. 21-26.
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    NASA TECHNICAL REPORTS
  • 3
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    Reactivity of nonaqueous organic electrolytes towards lithium (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The successful operation of an ambient temperature secondary lithium cell is primarily dependent on the stability of the electrolyte towards lithium. The lithium electrode on open circuit must be inert towards the electrolyte to achieve a long shelf life. The reactivity of tetrahydrofuran and 2-methyltetrahydrofuran based electrolytes with additives such as 2-methylfuran, ethylene carbonate, propylene carbonate, and 3-methylsulfolane was investigated by microcalorimetry and ac impedance spectroscopy techniques. Also the stability of electrolytes by open circuit stand tests was studied. Addition of ethylene carbonate and 2-methylfuran additives was found to improve the stability of tetrahydrofuran and 2-methyltetrahydrofuran based electrolytes. Long term microcalorimetry and ac impedance data clearly confirmed the higher stability of ethylene carbonate/2-methyltetrahydrofuran electrolyte compared to the 2-methyltetrahydrofuran and propylene carbonate/2-methyltetrahydrofuran electrolytes.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
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    NASA TECHNICAL REPORTS
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