Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 26, Pages 15673-15682Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta04550c
Keywords
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Funding
- Beijing Natural Science Foundation [2192034]
- China Postdoctoral Science Foundation [2018M631335]
- National Key R&D Program of China [2018YFB0905600]
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Low-cost potassium-ion batteries (KIBs) are emerging as an appealing technology for energy storage applications; however, the large radius of K+ brings great challenges during fast and durable potassium storage. Moreover, research on the electrolytes and binders used in KIBs is rarely reported. As a conversion-type anode material with high theoretical capacity, iron phosphide (FeP) is a promising candidate for service if its innate drawbacks of feeble electrical conductivity and inferior structural durability during cycling can be addressed. In this regard, we fabricated a three-dimensional (3D) foam-like graphenic carbon scaffold incorporated with FeP nanoparticles (FeP@FGCS) through a straightforward pyrolysis-blowing and phosphorization approach. The evenly incorporated FeP NPs were tightly fixed by strong P-C chemical bonds to the well-constructed FGCS scaffold, which not only served as a conductive pathway for accelerated transport of K+ and electron, but also alleviated the volume variation of FeP NPs accompanied with the K+ intercalation to preserve the integrity of the active materials. Moreover, the elaborately selected ether-based electrolyte and binder further facilitated the cycle stability of the electrodes. Thus, FeP@FGCS exhibited superior electrochemical activity in KIBs by maintaining the high specific capacity of 183 mA h g(-1) after 1000 cycles at the high current density of 3 A g(-1).
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