Microwave‐Assisted Synthesis of Co 3 O 4 Sheets for Reversible Li Storage: Regulation of Structure and Performance

To elucidate the relationship between the structure and Li‐storage performances, a controllable and porous nanosheet‐shaped Co 3 O 4 material (Co 3 O 4 ‐AS) was constructed from nano‐β‐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 effectively applied an a highly reversible Li‐storage anode in a lithium‐ion battery, with a reversible capacity of 920 mAh g −1 after 100 cycles and even a capacity of 445 mAh g −1 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 electronic−ionic conductivity, and structural stability during cycling.