Abstract
Graphite-like carbon materials were investigated to learn whether they form hydrogen-graphite intercalation compounds (H-GICs), which would be useful as hydrogen storage materials in rechargeable batteries. The ability of graphite-like materials to absorb hydrogen was examined with cyclic voltammetry (CV) and constant-current charge and discharge tests in 6 mol dm-3 KOH. It was concluded that H-GICs did not form under our experimental conditions. In order to understand the difference between hydrogen and lithium ions in ability to form the intercalation compounds with graphite-like carbon materials, molecular orbital analyses were carried out. The results demonstrate that lithium-graphite intercalation compounds (Li-GICs) are stable because of the presence of lithium 2p-orbitals, whereas such stable graphite intercalation compounds do not form with hydrogen ions because no three-dimensional p-orbitals are available.
Original language | English |
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Pages (from-to) | 2707-2717 |
Number of pages | 11 |
Journal | Electrochimica Acta |
Volume | 42 |
Issue number | 17 |
DOIs | |
Publication status | Published - 1997 |
Keywords
- Graphite intercalation compounds
- Hydrogen
- Lithium
- Molecular orbital methods
ASJC Scopus subject areas
- Chemical Engineering(all)
- Electrochemistry