Department of Mechanical and Materials Engineering, University of Western Ontario , London, Ontario N6A 5B9, Canada.
Department of Physics and Astronomy, University of Western Ontario , London, Ontario N6A 3K7, Canada.
Nano Lett. 2017 Sep 13;17(9):5653-5659. doi: 10.1021/acs.nanolett.7b02464. Epub 2017 Aug 25.
Metallic Na anode is considered as a promising alternative candidate for Na ion batteries (NIBs) and Na metal batteries (NMBs) due to its high specific capacity, and low potential. However, the unstable solid electrolyte interphase layer caused by serious corrosion and reaction in electrolyte will lead to big challenges, including dendrite growth, low Coulombic efficiency and even safety issues. In this paper, we first demonstrate the inorganic-organic coating via advanced molecular layer deposition (alucone) as a protective layer for metallic Na anode. By protecting Na anode with controllable alucone layer, the dendrites and mossy Na formation have been effectively suppressed and the lifetime has been significantly improved. Moreover, the molecular layer deposition alucone coating shows better performances than the atomic layer deposition AlO coating. The novel design of molecular layer deposition protected Na metal anode may bring in new opportunities to the realization of the next-generation high energy-density NIBs and NMBs.
金属钠阳极因其高比容量和低电位而被认为是钠离子电池（NIBs）和钠金属电池（NMBs）的有前途的替代候选物。然而，电解质中严重的腐蚀和反应会导致不稳定的固体电解质界面层，从而带来重大挑战，包括枝晶生长、低库仑效率甚至安全问题。在本文中，我们首先通过先进的分子层沉积（alucone）展示了无机-有机涂层作为金属钠阳极的保护层。通过用可控的 alucone 层保护 Na 阳极，可以有效抑制枝晶和苔藓状 Na 的形成，显著提高电池寿命。此外，分子层沉积 alucone 涂层的性能优于原子层沉积 AlO 涂层。这种分子层沉积保护的 Na 金属阳极的设计可能为下一代高能量密度 NIBs 和 NMBs 的实现带来新的机遇。
