Few-layer bismuth selenide cathode for low-temperature quasi-solid-state aqueous zinc metal batteries
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Original language | English |
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Article number | 752 |
Journal / Publication | Nature Communications |
Volume | 13 |
Online published | 8 Feb 2022 |
Publication status | Published - 2022 |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85124270855&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(e3754fb3-b6ce-4307-9f27-30355ef3bea5).html |
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 Bi2Se3 (a topological insulator) as cathode material for Zn metal batteries. When the few-layer Bi2Se3 is used in combination with an anti-freeze hydrogel electrolyte, the capacity delivered by the cell at −20 °C and 1 A g−1 is 1.3 larger than the capacity at 25 °C for the same specific current. Also, at 0 °C the Zn | |few-layer Bi2Se3 cell shows capacity retention of 94.6% after 2000 cycles at 1 A g−1. This behaviour is related to the fact that the Zn-ion uptake in the few-layer Bi2Se3 is higher at low temperatures, e.g., almost four Zn2+ at 25 °C and six Zn2+ at −20 °C. We demonstrate that the unusual performance improvements at low temperatures are only achievable with the few-layer Bi2Se3 rather than bulk Bi2Se3. We also show that the favourable low-temperature conductivity and ion diffusion capability of few-layer Bi2Se3 are linked with the presence of topological surface states and weaker lattice vibrations, respectively.
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Citation Format(s)
Few-layer bismuth selenide cathode for low-temperature quasi-solid-state aqueous zinc metal batteries. / Zhao, Yuwei; Lu, Yue; Li, Huiping et al.
In: Nature Communications, Vol. 13, 752, 2022.
In: Nature Communications, Vol. 13, 752, 2022.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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