Reduced graphene oxide-wrapped pyrite as anode materials for Li-ion batteries with enhanced long-term performance under harsh operational environments

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 326; pp. 257 - 264
• Main Authors: Du, Yao, Wu, Songping, Huang, Mingbao, Tian, Xiaodong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2017
• Subjects: Anode materials; FeS2 microspheres; LIBs; Reduced graphene oxide; FeS2 microspheres; Reduced graphene oxide; LIBs; Anode materials
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2017.05.111

Cauliflower-like FeS2 microspheres tightly wrapped by reduced graphene oxide (FeS2@rGO) have been synthesized by a facile and eco-friendly solution reaction route. Self-assembled mesostructured FeS2 microspheres @rGO delivered excellent cycle stability, i.e. a remarkable reversible capacity of 1720mAhg−1 at a current density of 0.2Ag−1 after 700 cycles at ambient temperature and an outstanding reversible capacity of 340mAhg−1 at a current density of 5.0Ag−1 after 800 cycles as operated at an extreme temperature of 85°C. All of these characteristics make FeS2 microspheres@rGO promising anode materials for LIBs with ultra-long lifetimes and large energy density. [Display omitted] •A facile route to rGO wrapped cauliflower-like FeS2 microspheres has been provided.•FeS2@rGO electrodes possessed outstanding performance under harsh environments.•These attributes make FeS2@rGO particles promising candidate as anode materials. Cauliflower-like FeS2 microspheres tightly wrapped by reduced graphene oxide (rGO-wrapped FeS2) have been synthesized by a facile and eco-friendly solution route. Self-assembled mesostructured FeS2 microspheres wrapped by rGO delivered excellent cycle performances, i.e. a remarkable reversible capacity of 1720mAhg−1 at a current density of 0.2Ag−1 after 700 cycles at ambient temperature and an outstanding reversible capacity of 340mAhg−1 at a current density of 5.0Ag−1 after 800 cycles as operated at an extreme temperature of 85°C. All of these characteristics of rGO-wrapped FeS2 could be ascribed to artificially designed microstructure and gradual change of electrochemical reaction upon Li-cycling, making them promising anode materials for power batteries with ultra-long lifetimes and large energy density under harsh operational windows.