In:
Angewandte Chemie, Wiley, Vol. 131, No. 46 ( 2019-11-11), p. 16626-16631
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 (KTiOPO 4 ), 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 %). KTiOPO 4 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.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v131.46
DOI:
10.1002/ange.201909202
Language:
English
Publisher:
Wiley
Publication Date:
2019
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