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Few-layer bismuth selenide cathode for low-temperature quasi-solid-state aqueous zinc metal batteries.
- Source :
- Nature Communications; 11/8/2022, Vol. 13 Issue 1, p1-12, 12p
- Publication Year :
- 2022
-
Abstract
- The performances of rechargeable batteries are strongly affected by the operating environmental temperature. In particular, low temperatures (e.g., ≤0 °C) are detrimental to efficient cell cycling. To circumvent this issue, we propose a few-layer Bi<subscript>2</subscript>Se<subscript>3</subscript> (a topological insulator) as cathode material for Zn metal batteries. When the few-layer Bi<subscript>2</subscript>Se<subscript>3</subscript> is used in combination with an anti-freeze hydrogel electrolyte, the capacity delivered by the cell at −20 °C and 1 A g<superscript>−1</superscript> is 1.3 larger than the capacity at 25 °C for the same specific current. Also, at 0 °C the Zn | |few-layer Bi<subscript>2</subscript>Se<subscript>3</subscript> cell shows capacity retention of 94.6% after 2000 cycles at 1 A g<superscript>−1</superscript>. This behaviour is related to the fact that the Zn-ion uptake in the few-layer Bi<subscript>2</subscript>Se<subscript>3</subscript> is higher at low temperatures, e.g., almost four Zn<superscript>2+</superscript> at 25 °C and six Zn<superscript>2+</superscript> at −20 °C. We demonstrate that the unusual performance improvements at low temperatures are only achievable with the few-layer Bi<subscript>2</subscript>Se<subscript>3</subscript> rather than bulk Bi<subscript>2</subscript>Se<subscript>3</subscript>. We also show that the favourable low-temperature conductivity and ion diffusion capability of few-layer Bi<subscript>2</subscript>Se<subscript>3</subscript> are linked with the presence of topological surface states and weaker lattice vibrations, respectively. The performances of rechargeable batteries are detrimentally affected by low temperatures (e.g., < 0 °C). Here, the authors report a few-layer Bi2Se3 material capable of improving battery cycling performances when operational temperatures are shifted from +25 °C to −20 °C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 13
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 160074917
- Full Text :
- https://doi.org/10.1038/s41467-022-28380-y