The multi-yolk/shell structure of FeP@foam-like graphenic scaffolds: strong P–C bonds and electrolyte- and binder-optimization boost potassium storage. Issue 26 (14th June 2019)

• Record Type: Journal Article
• Authors: Tan, Qiwei; Zhao, Wang; Han, Kun; Li, Ping; Wang, Wei (Alex); He, Donglin; Liu, Zhiwei; Yu, Qiyao; Qin, Mingli; Qu, Xuanhui
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 26(2019)
• Page Start: 15673
• Page End: 15682
• Publication Date: 2019-06-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta04550c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : We fabricate novel FeP@Foam-like graphenic scaffolds (termed as FeP@FGCS) via a facile pyrolysis-blowing strategy toward fast and durable potassium storage. Abstract : 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 .