Structuring Al3+-doped LiNi1∕3Co1∕3Mn1∕3O2 by 3D-birdnest-shaped MnO2

Abstract

The successfully prepared 3D-birdnest-shaped MnO2 had a hollow structure and a large amount of free space among nanotubes, which was more favorable for other substances to attach on it. Due to its special structure, we prepared the LiNi[Formula: see text]Co[Formula: see text]Mn[Formula: see text]AlxO2 ([Formula: see text], 0.01, 0.03, 0.05, 0.08) in a simple way by employing 3D-birdnest-shaped MnO2, and revealed the influence of Al[Formula: see text]-doped in LiNi[Formula: see text]Co[Formula: see text]Mn[Formula: see text]O2. And the sample of LiNi[Formula: see text]Co[Formula: see text]Mn[Formula: see text]O2 had outstanding electrochemical properties; when a small amount of Al[Formula: see text] ([Formula: see text]) was doped into the material, the cyclic performance of the material was improved significantly (90.9% capacity retention after 100 cycle), and the capacity of the LiNi[Formula: see text]Co[Formula: see text]Mn[Formula: see text]AlxO2 reached 186.2[Formula: see text]mAh[Formula: see text]g[Formula: see text]. Our results provided the underlying insights needed to guide the design of cathode materials.