Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 23, Pages 13050-13056Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202103475
Keywords
cathode materials; electrochemical performance; low-strain materials; potassium-ion batteries; Prussian blue analogues
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Funding
- National Key R&D Program of China [2017YFA0206700]
- National Natural Science Foundation of China [21835004, 51971124]
- 111 Project from the Ministry of Education of China [B12015]
- Young Elite Scientists Sponsorship Program by CAST [2019QNRC001]
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This study introduces a low-strain potassium-rich cathode material KNiHCF for potassium ion batteries, which exhibits superior discharge capacity and cycling stability due to its low-strain de-/intercalation mechanism, intrinsic semiconductor property, and low potassium diffusion energy barrier.
Most of the cathode materials for potassium ion batteries (PIBs) suffer from poor structural stability due to the large ionic radius of K+, resulting in poor cycling stability. Here we report a low-strain potassium-rich K1.84Ni[Fe(CN)(6)](0.88).0.49 H2O (KNiHCF) as a cathode material for PIBs. The as-prepared KNiHCF cathode can deliver reversible discharge capacity of 62.8 mAh g(-1) at 100 mA g(-1), with a high discharge voltage of 3.82 V. It can also achieve a superior rate performance of 45.8 mAh g(-1) at 5000 mA g(-1), with a capacity retention of 88.6 % after 100 cycles. The superior performance of KNiHCF cathode results from low-strain de-/intercalation mechanism, intrinsic semiconductor property and low potassium diffusion energy barrier. The high power density and long-term stability of KNiHCF//graphite full cell confirmed the feasibility of K-rich KNiHCF cathode in PIBs. This work provides guidance to develop Prussian blue analogues as cathode materials for PIBs.
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