Carbon Nanotube Current Collector for Anode-free Battery

초록

Lithium metal batteries (LMBs) have been gained attention for next-generation electrical energy storage becauseof their high energy density on both volumetric and gravimetric bases. However, in order to match the capacity ratio betweenLi metal and cathode, the thickness of Li metal must be 100 μm or less, but it is difficult to manufacture thin Li metal in alarge area. Rather than changing the thickness of lithium, the anode-free battery, which has the advantage of achieving highenergy density, is an alternative for LMB. Also, unlike LMBs, self-discharging does not occur in the anode-free battery afterthe battery is assembled. In addition, LMBs have low cycle stability due to moss-like deposition and dendrite growth duringcharge and discharge. In this work, carbon nanotube (CNT) film was used as a current collector for an anode-free battery, andthe electrochemical properties were analyzed. The surface morphology of Li metal plated on the CNT film was smooth andnot mossy-like because Li nucleation and Li growth occurred uniformly due to the low Li nucleation activation energy andthe large specific surface area of CNT film, which made the Li+ flux occurs evenly. These results demonstrate the highpotential of the CNT film as a current collector for an anode-free battery.

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