To elucidate the relationship between the structure and Listorage performances, a controllable and porous nanosheetshaped Co 3 O 4 material (Co 3 O 4 -AS) was constructed from nanob-Co(OH) 2 precursor, which was obtained from a common Co (NO 3 ) 2 solution without any templates under microwave radiation conditions. A probable assembly mechanism is proposed on the basis of various analyses and comparisons. After its structure was characterized by using SEM, XRD, TEM, and N 2 absorption/desorption isotherms, Co 3 O 4 -AS was effec-tively applied an a highly reversible Li-storage anode in a lithium-ion battery, with a reversible capacity of 920 mAh g À1 after 100 cycles and even a capacity of 445 mAh g À1 at 5C. The improved properties could be attributed to the remarkable synergistic effects between porous structures and sheet-shaped morphologies, resulting in short and facile diffusion, good electronicÀionic conductivity, and structural stability during cycling.[a] Dr.

Porous Co3O4 nanosheets were designed and fabricated from common Co(NO3 )2 solution without any surfactants or templates under microwave radiation conditions. After the microstructures and morphologies were characterized by scanning electron microscope (SEM), X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), and N2 absorption/desorption isotherms techniques, the obtained Co3O4 nanosheets were applied for reversible Li‐storage, displaying larger capacity, better cycling performance and rate capability, i.e., a reversible specific capacity of ca. 800 mAh/g during initial 30 cycles and a reversible capacity of 450 mAh/g at 2C for Co3O4 nanosheets, which were almost twice higher than those for Co3O4 nanoparticles. The improved cycling stability could be attributed to the remarkable synergistic effects between porous structures and nanosheet‐like morphologies.

Cu-modified Co 3 O 4 nanosheets were designed and fabricated via a facile two-step process by a simple microwave-assisted reaction to synthesise Co 3 O 4 sheets, followed by chemically reducing copper ion on Co 3 O 4 sheets. The structures and morphologies of the obtained sheet-like Cu-modified Co 3 O 4 nanomaterials were characterised by X-ray diffractometer, scanning electron microscopy, and transmission electron microscopy. As the anode materials for the lithium-ion battery applications, the Cu-modified Co 3 O 4 nanosheet electrode delivered an initial discharge capacity of 1208 mAh g −1 and its initial coulombic efficiency was 82.24%, much higher than 74.8% for Co 3 O 4 sheets. More importantly, a reversible capacity of ca. 600 mAh g-1 could be reached at a higher current density of 890 mA g −1. The enhanced electrochemical performance may be attributed the incorporated Cu as well as the porous structure and the sheet-like morphology of the Co 3 O 4 active materials.