H.D. Shi, M. Yue, C.F. (J.) Zhang, Y.F. Dong, P.F. Lu, S.H Zheng, H.J. Huang, J. Chen, P.C. Wen, Z.C. Xu, Q. Zheng, X.F. Li, Y. Yu*, Z.-S. Wu*
ACS Nano, 2020, Accepted.
Alkali-metals are ideal anodes for high-energy-density rechargeable batteries, while seriously hampered by limited cycle life and low areal-capacities. To this end, rationally designed frameworks for dendrite-free and volume-changeless alkali-metal deposition at both high current densities and capacities are urgently required. Herein,a general 3D conductive Ti3C2TXMXene-melamine foam (MXene-MF) is demonstrated as elastically scaffolds for dendrite-free, high areal-capacity alkali-anodes (Li, Na, K). Owing to the lithiophilic nature of F-terminated MXene, conductive macroporous network and excellent mechanical toughness,the constructed MXene-MF synchronously achieves a high current density of 50 mA cm-2for Li plating, high areal-capacity (50 mAh cm-2) with high Coulombic efficiency (99%) and long lifetime (3800 h), surpassing the reported Li anodes recently. Meanwhile, MXene-MF shows flat voltage profiles for 720 h at 10 mA cm-2for Na anode and 800 h at 5 mA cm-2for K anode, indicative of wide applicability. Notably, the high current density of 20 mA cm-2for 20 mAh cm-2for Na anode, accompanying good recyclability rarely achieved before. When coupled with sulfur or Na3V2(PO4)3cathodes,the assembled MXene-MF alkali (Li, Na) based full-batteries showcase enhanced rate capability and cycling stability, demonstrating the potential of MXene-MF for advanced alkali-metal batteries.