Lithium (Li) metal battery is one of the ideal candidates for the next-generation high-energy-density batteries, but its practical application is still plagued by its large volume change, low coulombic efficiency (CE), and safety issues related to dendrite growth. This work describes a potential solution to these issues using a cross-linked Li9Al4-Li3N-AlN (LLA) structure as a stable host for Li metal anode. The in situ-formed uniform Li9Al4 and Li3N sites on AlN nano-clusters can suppress dendrite growth during the Li plating/stripping process. The intrinsic lithiophilicity of Li9Al4 sites with adjacent Li3N attracts Li+ ions for fast migration and uniform plating/stripping. These unique features lead to dimensional stability of Li@LLA composite anodes (1540 mAh g-1 and 1600 mAh cm-3). High-rate, high-capacity cycling of Li metal anodes has been maintained with a CE of ~98% in carbonate-based electrolytes. High capacity retention of 90.1% is achieved for a Li@LLA||LiNi0.8Co0.1Mn0.1O2 full cell at the 200th cycle. Therefore, the LLA structure with a simple fabrication process could be a promising candidate to enhance the safety of next-generation Li metal batteries.
Revised: May 30, 2019 |
Published: May 1, 2019
Citation
Peng Z., F. Ren, S. Yang, M. Wang, J. Sun, D. Wang, and W. Xu, et al. 2019.A Highly stable host for lithium metal anode enabled by Li9Al4-Li3N-AlN structure.Nano Energy 59.PNNL-SA-139672.doi:10.1016/j.nanoen.2019.02.033