Basic Studies of the Lithium Secondary Electrode

Rechargeable high energy density Li batteries require an efficient Li electrode. Earlier work with propylene carbonate (PC), methyl acetate (MA), and tetrahydrofuran (THF)-based electrolytes yielded poor Li electrode cycling efficiencies due to the electrolyte reduction by Li. We find 2-methyltetrah...

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Bibliographic Details
Main Authors: Brummer,S Barry, Koch,Victor R, Goldman,Jay L, Mank,Richard M, Mattos,Cynthia J
Format: Report
Language:English
Subjects:
ARSENIC COMPOUNDS
Atomic and Molecular Physics and Spectroscopy
BUTYL RADICALS
Chemical stability
CORROSION INHIBITION
Electrochemical Energy Storage
ELECTRODES
ELECTROLYTES
FLUORIDES
Furan/Tetrahydro
LITHIUM
Lithium arsenic hexafluoride
Lithium batteries
LITHIUM COMPOUNDS
Lithium electrodes
MOLECULAR ORBITALS
OXIDES
PC(Propylene Carbonate)
STORAGE BATTERIES
THERMAL STABILITY
THF(Tetrahydrofuran)
WUNR359638
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Summary:Rechargeable high energy density Li batteries require an efficient Li electrode. Earlier work with propylene carbonate (PC), methyl acetate (MA), and tetrahydrofuran (THF)-based electrolytes yielded poor Li electrode cycling efficiencies due to the electrolyte reduction by Li. We find 2-methyltetrahydrofuran (2-Me-THF)/LiAsF6 media to be remarkably stable toward Li resulting in cycling efficiencies which approach 98%. The ability of 2-Me-THF in particular, and alpha-methylated THFs in general, to resist reduction by Li is thought to be based on the position of its lowest unfilled molecular orbital (LUMO) relative to that of THF. (Author)