Abstract
? 2022 Elsevier B.V.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.
NSTL
Elsevier