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Self-templating growth of Sb2Se3@C microtube: a convention-alloying-type anode material for enhanced K-ion batteries.
- Source :
- Journal of Materials Chemistry A; 5/21/2019, Vol. 7 Issue 19, p12283-12291, 9p
- Publication Year :
- 2019
-
Abstract
- Potassium-ion batteries (PIBs) have attracted increasing attention in the past two years. However, the lower intercalation-type capacity of the current graphite anode has limited the development of PIBs. Herein, we report a convention-alloying-type hollow Sb<subscript>2</subscript>Se<subscript>3</subscript>@C microtube prepared via a self-templated route by employing Sb<subscript>2</subscript>O<subscript>3</subscript> microrods as the self-sacrificial templates. In situ Raman spectra investigation confirmed that the potassium storage mechanism of the Sb<subscript>2</subscript>Se<subscript>3</subscript>@C microtubes is the convention-alloying-type with the formation of K<subscript>2</subscript>Se in the first convention reaction process and K<subscript>3</subscript>Sb phase in the following alloying reaction stage. As an anode material for PIBs, the Sb<subscript>2</subscript>Se<subscript>3</subscript>@C microtubes exhibit a capacity of 312.8 mA h g<superscript>−1</superscript> at 100 mA g<superscript>−1</superscript> after 40 cycles, and a rate capability of 223.3 mA h g<superscript>−1</superscript> at 1 A g<superscript>−1</superscript>. The capacity could be maintained at 191.4 mA h g<superscript>−1</superscript> at 500 mA g<superscript>−1</superscript> even after 400 cycles, suggesting that the carbon-supported hollow structure is in favor of enhanced potassium storage. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 7
- Issue :
- 19
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 136481483
- Full Text :
- https://doi.org/10.1039/c9ta02204j