Hierarchical copper manganese oxide porous micro/nanospheres with high electrochemical performance

Abstract

In this contribution, hierarchical copper manganese oxide porous micro/nanospheres have been synthesized through sacrificial manganese carbonate micro/nano spheres precursor. The morphology and structure are examined by scanning electron microscope (SEM), X-ray diffraction (XRD), transmission electron microscopic (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmet-Teller adsorption (BET). As electrode of lithium-half cells, the as-synthesized sample demonstrates the remarkably enhanced lithium storage performance compared to those of bulk counterparts and the reported literature, in terms of high first discharge capacity (1191.8 mAh g−1), satisfactory cycle performance (462.7 mAh g−1 at 2 C after 500 cycles), fair rate capability (357.8 mAh g- even at 5 C), quick Li+ diffusion kinetics (1.1 ×10−12 cm2 s−1), as well as low activation energy (13.06 KJ mol−1). Interestingly, the hierarchical micro/nanospheres are well maintained after 500 cycles.