In situ observation and evaluation of electrodeposited lithium by means of optical microscopy with alternating current impedance spectroscopy
- Waseda Univ., Tokyo (Japan). Dept. of Applied Chemistry
Lithium batteries are some of the best candidates for use as high energy density batteries and have been widely studied. Electrodeposited lithium was evaluated by ac impedance measurement and optical microscopy in two solutions containing LiClO[sub 4]; a propylene carbonate (PC) solution and a blended solution consisting of PC and 1,2-dimethoxyethane (DME) (volume ratio = 1:1). The ac impedance data were analyzed in the higher frequency region, where the charge-transfer resistance (R) of Li[sup +] + e[sup [minus]] [r reversible] Li can be evaluated. The value of R was always larger in the PC electrolyte solution than in the PC-DME(1:1) electrolyte solution, and R depended on the lithium deposition charge. Microscopic observation indicated that lithium deposited more uniformly in PC-DME (1:1) than in PC solution. The results of morphological evaluation of the electrodeposited lithium using optical microscopy corresponded to the variations in the value of R obtained from ac impedance measurements, showing that the behavior of R accurately represented the morphological state. The cycleability of the lithium anode was investigated by charge-discharge testing. The cycle efficiency was worse in PC than in PC-DME (1:1) solution; this seems to be related to the morphological properties of the lithium deposits.
- OSTI ID:
- 6008492
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:10; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALKALI METALS
ANODES
DATA
DEPOSITION
ELECTRIC BATTERIES
ELECTRIC CONDUCTIVITY
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTRODEPOSITION
ELECTRODES
ELECTROLYSIS
ELEMENTS
EXPERIMENTAL DATA
IMPEDANCE
INFORMATION
LITHIUM
LYSIS
METALS
MICROSCOPY
MORPHOLOGY
NUMERICAL DATA
OPTICAL MICROSCOPY
PERFORMANCE TESTING
PHYSICAL PROPERTIES
SURFACE COATING
TESTING