Energy and capacity projections for practical dual-graphite cells

Journal Article · Wed Mar 01 04:00:00 EST 2000 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1393289· OSTI ID:20030645

Dahn, J R; Steel, J A

Anion intercalation in graphite was investigated in the preceding paper. It was shown that about 140 mAh/g, corresponding to stage-two{prime} (PF{sub 6})C{sub 16}, of charge could be stored at potentials near 5 V vs. Li. Dual-graphite cells, where Li intercalates into the negative electrode and PF{sub 6} into the positive electrode, are therefore possible, as has been demonstrated before by others. Unlike a Li-ion cell, where the amount of electrolyte in the cell can be minimized to obtain high energy density, in a dual-graphite cell there must be enough electrolyte present to provide the ions needed during the charging of the cell. This leads to a strategy in cell design that differs from the Li-ion case, in that electrolytes with high salt concentration are crucial if high energy density is to be obtained. Here, the specific capacity, specific energy, volumetric capacity, and energy density of practical dual-graphite cells are predicted. The calculations focus on the effect of the maximum salt concentration difference in the electrolyte between the fully discharged and fully charged states.

• Research Organization: Dalhousie Univ., Halifax, Nova Scotia (CA)
• OSTI ID: 20030645
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 3 Vol. 147; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
ANIONS
CATIONS
DESIGN
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRODES
GRAPHITE