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In silicon monoxide (SiOx) anodes, a Li powder coating of the anode has been reported to reduce the irreversible capacity drop in the first cycle. In this study, instead of modifying the electrodes, Li powder was loaded on a separator to overcome the large irreversible capacity loss. A SiOx anode and a lithium-cobalt oxide (LCO) cathode coin-cell (CR2032) were assembled with a Li-coated separator in a dry room. The charge capacity of the cell using the Li-coated separator was 1502.0 mAhg in the first cycle at 0.1 C, while in the case of the uncoated separator was 1534.3 mAhg. In addition, the Lipowder-coated separator in the cell showed a discharge capacity of 1334.2 mAhg, which was higher than that of the cell equipped with an uncoated separator (1019.3 mAhg). Electrochemical analysis proved that the capacity decrease in the first cycle was reduced to 11.2%, compared with a 33.6% capacity loss in the pure SiOx anode. The Li-coated separator was also effective on Graphite and Silicon anodes. In Graphite anode, irreversible capacity loss of first cycle was reduced 8.2% while pure Graphite was 13.4%. The irreversible capacity of Silicon anode was also improved 27.6% to 12.6% when Licoated separator used. The morphology changes in the Li-coated separator were observed by scanning electron microscopy (SEM). The results mean that Li coating, even on a separator, could play the role of an effective reserve layer that can compensate for the irreversible capacity loss during the first stage.

Fabrication of Li Powder Coated Separator to Reduce Irreversible Loss of Various Anodes for Lithium Ion Battery