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Issue 36, 2016
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Mechanism of potassium ion intercalation staging in few layered graphene from in situ Raman spectroscopy

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Abstract

Recently emerging potassium ion (K-ion) batteries offer a lower-cost alternative to lithium-ion batteries while enabling comparably high storage capacity. Here, we leverage the strong Raman spectroscopic response of few-layered graphene to provide the first insight into the electrochemical staging sequence for K+ ions in graphitic carbons. Our analysis reveals the signature of a dilute stage I compound that precedes formation of ordered intercalation compounds transitioning from stage VI (KC72), stage II (KC24), and stage I (KC8) and correlates electrochemical responses to the stage formation. Overall, our study emphasizes a minimum barrier to transfer the general understanding acquired for lithium-ion battery anodes to cheaper, earth abundant K-ion battery systems ideally suited for grid-scale storage.

Graphical abstract: Mechanism of potassium ion intercalation staging in few layered graphene from in situ Raman spectroscopy

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Publication details

The article was received on 19 May 2016, accepted on 26 Aug 2016 and first published on 30 Aug 2016


Article type: Paper
DOI: 10.1039/C6NR04084E
Nanoscale, 2016,8, 16435-16439

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    Mechanism of potassium ion intercalation staging in few layered graphene from in situ Raman spectroscopy

    K. Share, A. P. Cohn, R. E. Carter and C. L. Pint, Nanoscale, 2016, 8, 16435
    DOI: 10.1039/C6NR04084E

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