Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 161, Issue 10, Pages A1753-A1758Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0031412jes
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Funding
- Industrial Strategic Technology Development Program - Ministry of Knowledge Economy (MKE, Korea) [10045221]
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Lithium powder coatings on anodes have been reported to reduce the irreversible first-cycle capacity loss in silicon monoxide (SiOx) anodes. Instead of electrodes, we coated a separator with Li powder to reduce the irreversible capacity. We assembled a SiO, anode and Li cobalt oxide (LCO) cathode coin cell (CR2032) with an Li-coated separator in an argon-filled glove box. The charge capacity of the obtained separator in a cell at 0.1 degrees C was 1502.0 mAh in the first cycle, while that of an uncoated separator was 1534.3 mAh g(-1). The former also had a higher discharge capacity than the latter, 1334.2 compared to 1019.3 mAh g(-1). Using electrochemical analysis it was estimated that the first cycle irreversible capacity loss ratio was 11.2% with the Li coating compared to the 33.6% capacity drop in pure SiOx cells. Morphology changes in the Li-coated separator are also observed using a scanning electron microscope. The results indicate that a uniform Li coating on a separator acts as an effective reserve layer, reducing the irreversible first-cycle capacity loss.
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