Two-Dimensional Unilamellar Cation-Deficient Metal Oxide Nanosheet Superlattices for High-Rate Sodium Ion Energy Storage

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Title
Two-Dimensional Unilamellar Cation-Deficient Metal Oxide Nanosheet Superlattices for High-Rate Sodium Ion Energy Storage
Author(s)
Pan Xiong; Xiuyun Zhang; Fan Zhang; Ding Yi; Jinqiang Zhang; Bing Sun; Huajun Tian; Devaraj Shanmukaraj; Teofilo Rojo; Michel Armand; Renzhi Ma; Takayoshi Sasaki; Guoxiu Wang
Publication Date
2018-12
Journal
ACS NANO, v.12, no.12, pp.12337 - 12346
Publisher
AMER CHEMICAL SOC
Abstract
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 © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5363
ISSN
1936-0851
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
Files in This Item:
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