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Hierarchical graphene@TiO2 sponges for sodium-ion storage with high areal capacity and robust stability.
- Source :
-
Electrochimica Acta . Sep2020, Vol. 355, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- The search for high mass-loaded, long-cycle-life and high-rate electrodes for sodium-ion batteries is an enormous challenge. Here, a free-standing hierarchical sponge composed of the upper-layer Graphene@TiO 2 composites and under-layer graphene (G@TiO 2 /G) was prepared as a sodium-ion anode. Thereinto, layer-by-layer graphene sheets not only construct robust framework but also guarantee fast electron transport paths, and the interconnected macroporous structure facilitates rapid ion transport. Moreover, the ultrasmall TiO 2 nanodots offer the short diffusion path and fast pseudocapacitive sodium storage capability. Therefore, such G@TiO 2 /G electrode exhibits an ultralong cycle life (retaining 101 mA h g−1 after 20,000 cycles at 2 A g−1), a superior capacity (260 mA h g−1 at 0.05 A g−1) and a high rate capability (53 mA h g−1 at 10 A g−1) under a mass loading of 2.5 mg cm−2. Impressively, the excellent cycling stability (retaining 1.37 mA h cm−2 after 300 cycles at 0.1 A g−1) and high areal capacity (2.27 mA h cm−2 at 0.53 mA cm−2) are also achieved even at a high mass loading of 10.5 mg cm−2. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 355
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 145442272
- Full Text :
- https://doi.org/10.1016/j.electacta.2020.136782