文摘
Among several materials (transition metal oxide) under development for use as a cathode in lithium-ion batteries, cubic spinel LiMn2O4 is one of the most promising cathode materials. In this study, the sea urchin-like LiMn2O4 hollow macrospheres were synthesized by using sea urchin-like 伪-MnO2 precursors through solid-state in situ self-sacrificing conversion route. The as-prepared LiMn2O4 was assembled by many single-crystalline 鈥渢horns鈥?of ca.10鈥?0聽nm in diameter and ca. 400鈥?00聽nm in length. Galvanostatic battery testing showed that sea urchin-like LiMn2O4 had an initial discharge capacity of 126.8聽mAh/g at the rate of 0.2聽C in the potential range between 3.0 and 4.5聽V. More than 96.67聽% of the initial discharge capacity was maintained for over 50聽cycles. The improved electrochemical properties were attributed to the reduced particle size and enhanced electrical contacts by the materials. This particular sea urchin-like structured composite conceptually provides a new strategy for designing electrodes in energy storage applications.