Behavior of nitrogen-substituted carbon (N[sub z]C[sub 1[minus]z]) in Li/Li(N[sub z]C[sub 1[minus]z])[sub 6] cells

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2054855· OSTI ID:7200889

Weydanz, W J; Way, B M; Dahn, J R ^[1]; Buuren, T van ^[2]

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1. Simon Fraser Univ., British Columbia (Canada). Dept. of Physics
2. Univ. of British Columbia, Vancouver, British Columbia (Canada). Dept. of Physics

Nitrogen-containing carbons N[sub z]C[sup 1[minus]z] have been made from different precursors at temperature between 850 and 1,050 C. Their composition and structure have been studies by chemical analysis, powder X-ray diffraction, X-ray absorption spectroscopy, and Auger electron spectroscopy. These techniques show that some nitrogen has been incorporated substitutionally for carbon. Nitrogen affects the behavior of Li/Li (N[sub z]C[sub 1[minus]z])[sub 6] electrochemical cells in two ways. First, the irreversible capacity observed during the first electrochemical reaction of Li with N[sub z]C[sup 1[minus]z] (during the first discharge) increases with the nitrogen content of the samples. Second, the incorporated nitrogen causes a shift of the cell capacity to lower voltages compared to pure carbon electrodes. The first effect can be understood qualitatively using a model where Li reacts irreversibly with nitrogen-containing species (the authors call these nitrogen atoms chemical nitrogen) to form lithium-nitrogen-organic compounds. The second effect is caused by the nitrogen which has been substituted for carbon in the lattice (so-called lattice nitrogen). Such nitrogen-containing carbons are not considered useful as anodes for Li-ion cells.

• OSTI ID: 7200889
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:4; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

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