Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 41, Pages 14740-14747Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201908542
Keywords
interphase layers; NiCo2; 5S(4) microrods; organic potassium salts; reduced graphene oxide; solid electrolytes
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Funding
- National Natural Science Foundation of China [51702056, 51772135]
- Ministry of Education of China [6141A02022516]
- China Postdoctoral Science Foundation [2017M622902, 2019T120790]
- Jinan University Postdoctoral Foundation
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Metal-organic framework-derived NiCo2.5S4 microrods wrapped in reduced graphene oxide (NCS@RGO) were synthesized for potassium-ion storage. Upon coordination with organic potassium salts, NCS@RGO exhibits an ultrahigh initial reversible specific capacity (602 mAh g(-1) at 50 mA g(-1)) and ultralong cycle life (a reversible specific capacity of 495 mAh g(-1) at 200 mA g(-1) after 1 900 cycles over 314 days). Furthermore, the battery demonstrates a high initial Coulombic efficiency of 78 %, outperforming most sulfides reported previously. Advanced ex situ characterization techniques, including atomic force microscopy, were used for evaluation and the results indicate that the organic potassium salt-containing electrolyte helps to form thin and robust solid electrolyte interphase layers, which reduce the formation of byproducts during the potassiation-depotassiation process and enhance the mechanical stability of electrodes. The excellent conductivity of the RGO in the composites, and the robust interface between the electrodes and electrolytes, imbue the electrode with useful properties; including, ultrafast potassium-ion storage with a reversible specific capacity of 402 mAh g(-1) even at 2 A g(-1).
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