Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 40, Pages 23046-23054Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta06327h
Keywords
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Funding
- National Natural Science Foundation of China [51832004, 21905218]
- Natural Science Foundation of Hubei Province [2019CFA001, 2020CFB519]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-003]
- Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City [520LH055]
- Sanya Science and Education Innovation Park of Wuhan University of Technology [2020KF0019]
- Fundamental Research Funds for the Central Universities [WUT: 2020IVB034, 2020IVA036, 2021CG014]
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Potassium (K) metal batteries are considered promising energy storage devices due to the properties of K metal. However, the growth of K dendrites poses a challenge. A dendrite-free K metal anode was achieved by constraining K metal on SnO2-modified commercial carbon cloth. This structure exhibited low polarization, long cycling life, and good performance in symmetric cells and full cells. The results suggest a potential for commercialization of K metal anodes.
Potassium (K) metal batteries are identified as some of the most potential candidates for next-generation energy storage devices due to the abundant reserves, low redox potential and high theoretical capacity of K metal. However, the practical application of K metal batteries is severely hindered by the uncontrollable growth of K dendrites. Herein, a dendrite-free and high-performance K metal anode was obtained by constraining K metal on SnO2-modified commercial carbon cloth (K-CC@SnO2). In the K-CC@SnO2 structure, K metal wraps the SnO2 particles and forms a closely connected structure with the carbon cloth. CC@SnO2 not only shows excellent potassiophilicity, but also possesses high electronic conductivity and large void spaces, which can induce the homogeneous deposition of K metal and accommodate the large volume changes of K during the plating/stripping processes. Consequently, the as-constructed K-CC@SnO2 anodes exhibit low polarization and long cycling life with a dendrite-free morphology in symmetric cells with a carbonate-based electrolyte. In addition, a perylene-3,4,9,10-tetracarboxylic diimide (PTCDI)||K-CC@SnO2 full cell shows excellent rate performance (112.5 mA h g(-1) @ 5 A g(-1)) and ultralong cycling life (up to 10 000 cycles). A PTCDI||K-CC@SnO2 pouch cell was successfully assembled and it delivers a long cycling life of 500 cycles with an energy density of 274 W h kg(-1). These results indicate that a simple and effective strategy has been proposed for the development of K metal anodes with commercialization potential.
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