期刊
ACS NANO
卷 12, 期 12, 页码 12337-12346出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b06206
关键词
cation vacancies; unilamellar nanosheets; low-temperature sodium storage; lepidocrocite-type titanium oxide; superlattice
类别
资金
- Australian Research Council [DP160104340, DP170100436]
- World Premier International Research Center Initiative on Materials Nanoarchitectonics (WPI-MANA), MEXT, Japan
Cation-deficient two-dimensional (2D) materials, especially atomically thin nanosheets, are highly promising electrode materials for electrochemical energy storage that undergo metal ion insertion reactions, yet they have rarely been achieved thus far. Here, we report a Ti-deficient 2D unilamellar lepidocrocite-type titanium oxide (Ti0.87O2) nanosheet superlattice for sodium storage. The superlattice composed of alternately restacked defective Ti0.87O2 and nitrogen-doped graphene monolayers exhibits an outstanding capacity of similar to 490 mA h g(-1) at 0.1 A g(-1), an ultralong cycle life of more than 10000 cycles with similar to 0.00058% capacity decay per cycle, and especially superior low-temperature performance (100 mA h g(-1) at 12.8 A g(-1) and -5 degrees C), presenting the best reported performance to date. A reversible Na+ ion intercalation mechanism without phase and structural change is verified by first-principles calculations and kinetics analysis. These results herald a promising strategy to utilize defective 2D materials for advanced energy storage applications.
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