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Abstract:
A key challenge for potassium-ion batteries is to explore low-cost electrode materials that allow fast and reversible insertion of large-ionic-size K+. Here, we report an inorganic-open-framework anode (KTiOPO4), which achieves a reversible capacity of up to 102 mAh g−1 (307 mAh cm−3), flat voltage plateaus at a safe average potential of 0.82 V (vs. K/K+), a long lifespan of over 200 cycles, and K+-transport kinetics ≈10 times faster than those of Na-superionic conductors. Combined experimental analysis and first-principles calculations reveal a charge storage mechanism involving biphasic and solid solution reactions and a cell volume change (9.5 %) even smaller than that for Li+-insertion into graphite (≈10 %). KTiOPO4 exhibits quasi-3D lattice expansion on K+ intercalation, enabling the disintegration of small lattice strain and thus high structural stability. The inorganic open-frameworks may open a new avenue for exploring low-cost, stable and fast-kinetic battery chemistry. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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Angewandte Chemie - International Edition
ISSN: 1433-7851
Year: 2019
Issue: 46
Volume: 58
Page: 16474-16479
1 2 . 9 5 9
JCR@2019
1 6 . 1 0 0
JCR@2023
ESI HC Threshold:184
JCR Journal Grade:1
CAS Journal Grade:1
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count: 57
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0
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