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 1720 mAh g (1) at a current density of 0.2 A g (1) after 700 cycles at ambient temperature and an outstanding reversible capacity of 340 mAh g (1) at a current density of 5.0 A g (1) after 800 cycles as operated at an extreme temperature of 85 degrees 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. (C) 2017 Elsevier B. V. All rights reserved.