Highly reversible potassium-ion intercalation in tungsten disulfide† †Dedicated to Prof. Jin-Shun Huang on the occasion of his 80th birthday. ‡ ‡Electronic supplementary information (ESI) available. See DOI: 10.1039/c8sc04350g

0.62 K+ readily (de)intercalates in WS2 with well-defined voltage plateaus, an intrinsically safe operation potential, and ultrahigh reversibility.

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