3D Porous Cu-Composites for Stable Li-Metal Battery Anodes

초록

Lithium (Li) metalis a promising anode material for lithium-ionbatteries (LIBs) because of its high theoretical specific capacityof 3860 mAh g(-1) and the low potential of -3.04V versus the standard hydrogen electrode (SHE). However, these anodesrely on repeated plating and stripping of Li, which leads to consumptionof Li inventory and the growth of dendrites that can lead to self-dischargeand safety issues. To address these issues, as well as problems relatedto the volume change of these anodes, a number of different porousconductive scaffolds have been reported to create high surface areaelectrode on which Li can be plated reliably. While impressive resultshave been reported in literature, current processes typically relyon either expensive or poorly scalable techniques. Herein, we reporta scalable fabrication method to create robust 3D Cu anodes usinga one-step electrodeposition process. The areal loading, pore structure,and electrode thickness can be tuned by changing the electrodepositionparameters, and we show how standard mechanical calendering providesa way to further optimize electrode volume, capacity, and cyclingstability. Optimized electrodes achieve high Coulombic efficiencies(CEs) of 99% during 800 cycles in half cells at a current densityof 0.5 mA cm(-2) with a total capacity of 0.5 mAhcm(-2). To the best of our knowledge, this is thehighest value ever reported for a host for Li-metal anodes using lithiumbis(trifluoro-methanesulfonyl)-imide LITFSI based electrolyte.

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