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231226s2022 xx |||||o 00| ||eng c |
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|a 10.1021/acs.chemmater.2c01570
|2 doi
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|a pubmed24n1151.xml
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|a DE-627
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|a eng
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| 100 |
1 |
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|a Ells, Andrew W
|e verfasserin
|4 aut
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|a Phase Transformations and Phase Segregation during Potassiation of Sn x P y Anodes
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|c 2022
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|a Text
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 30.08.2022
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2022 American Chemical Society.
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|a K-ion batteries (KIBs) have the potential to offer a cheaper alternative to Li-ion batteries (LIBs) using widely abundant materials. Conversion/alloying anodes have high theoretical capacities in KIBs, but it is believed that electrode damage from volume expansion and phase segregation by the accommodation of large K-ions leads to capacity loss during electrochemical cycling. To date, the exact phase transformations that occur during potassiation and depotassiation of conversion/alloying anodes are relatively unexplored. In this work, we synthesize two distinct compositions of tin phosphides, Sn4P3 and SnP3, and compare their conversion/alloying mechanisms with solid-state nuclear magnetic resonance (SSNMR) spectroscopy, powder X-ray diffraction (XRD), and density functional theory (DFT) calculations. Ex situ 31P and 119Sn SSNMR analyses reveal that while both Sn4P3 and SnP3 exhibit phase separation of elemental P and the formation of KSnP-type environments (which are predicted to be stable based on DFT calculations) during potassiation, only Sn4P3 produces metallic Sn as a byproduct. In both anode materials, K reacts with elemental P to form K-rich compounds containing isolated P sites that resemble K3P but K does not alloy with Sn during potassiation of Sn4P3. During charge, K is only fully removed from the K3P-type structures, suggesting that the formation of ternary regions in the anode and phase separation contribute to capacity loss upon reaction of K with tin phosphides
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|a Journal Article
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1 |
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|a Evans, Matthew L
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Groh, Matthias F
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Morris, Andrew J
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Marbella, Lauren E
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Chemistry of materials : a publication of the American Chemical Society
|d 1998
|g 34(2022), 16 vom: 23. Aug., Seite 7460-7467
|w (DE-627)NLM098194763
|x 0897-4756
|7 nnns
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| 773 |
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|g volume:34
|g year:2022
|g number:16
|g day:23
|g month:08
|g pages:7460-7467
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|u http://dx.doi.org/10.1021/acs.chemmater.2c01570
|3 Volltext
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|d 34
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|h 7460-7467
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