Effect of additives on lithium cycling efficiency
- NTT Interdisciplinary Research Labs., Ibaraki (Japan)
Lithium cycling efficiency was evaluated for LiAsF[sub 6]-ethylene carbonate/2-methyltetrahydrofuran mixed-solvent electrolyte (LiAsF[sub 6]-EC/2MeTHF) with several additives: tetraalkylammonium chlorides with a long n-alkyl chain and three methyl groups. The ammonium chlorides with n-alkyl group longer than n-C[sub 12]H[sub 25]- increased lithium cycling efficiency. Cetyltrimethylammonium chloride (CTAC) produced the best improvement in lithium cycling efficiency. A figure of merit (FOM) of lithium for 0.01 M CTAC was 46, which was 1.5 times the FOM for the corresponding additive-free electrolyte. The LiAsF[sub 6]-EC/2MeTHF with CTAC showed an increase in FOM with stack pressure, but the effect was less than that for the additive-free LiAsF[sub 6]-EC/2MeTHF. Scanning electron microscope observation showed that the addition of CTAC decreased the needle-like lithium deposition and increased particulate lithium deposition. This deposition morphology may be the main cause of the increase in FOM. The additive had no effect on rate capability for cell cycling at 3 mA/cm[sup 2] discharge and 1 mA/cm[sup 2] charge.
- OSTI ID:
- 7128380
- Journal Information:
- Journal of the Electrochemical Society; (United States), Vol. 141:9; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANODES
PERFORMANCE
ELECTRIC BATTERIES
ELECTROLYTES
ADDITIVES
LITHIUM
ELECTROCHEMISTRY
ARSENIC FLUORIDES
BATTERY CHARGING
EXPERIMENTAL DATA
LITHIUM FLUORIDES
VOLTAGE DROP
ALKALI METAL COMPOUNDS
ALKALI METALS
ARSENIC COMPOUNDS
CHEMISTRY
DATA
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
LITHIUM COMPOUNDS
LITHIUM HALIDES
METALS
NUMERICAL DATA
250902* - Energy Storage- Batteries- Performance & Testing
250903 - Energy Storage- Batteries- Materials
Components
& Auxiliaries