期刊
NANO LETTERS
卷 14, 期 1, 页码 139-147出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl4035626
关键词
Nanoglue; atomic-layer-deposition; tin anode; ionic conductivity; Na-ion battery anode; Al2O3
类别
资金
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center (EFRC)
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
- NSF [CMMI 1069076, 1129826]
- University of Maryland
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
Atomic-layer-deposition (ALD) coatings have been increasingly used to improve battery performance. However, the electrochemical and mechanistic roles remain largely unclear, especially for ALD coatings on electrodes that undergo significant volume changes (up to 100%) during charging/discharging. Here we investigate an anode consisting of tin nanoparticles (SnNPs) with an ALD-Al2O3 coating. For the first time, in situ transmission electron microscopy unveiled the dynamic mechanical protection of the ALD-Al2O3 coating by coherently deforming with the SnNPs under the huge volume changes during charging/discharging. Battery tests in coin-cells further showed the ALD-Al2O3 coating remarkably boosts the cycling performance of the Sn anodes, comparing with those made of bare SnNPs. Chemomechanical simulations clearly revealed that a bare SnNP debonds and falls off the underlying substrate upon charging, and by contrast the ALD-Al2O3 coating, like ion-conductive nanoglue, robustly anchors the SnNP anode to the substrate during charging/discharging, a key to improving battery cycle performance.
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