LixMn2O4 ultrathin nanosheets with faster Li+ diffusion for highly reversible Li-ions batteries

In this work, spinel LixMn2O4 with high crystallinity are successfully synthesized via a simple polyol-reflux process. Li0.93Mn2O4 shows ultrathin nanosheets structure (4 nm in thickness) with exposed {1 1 1} facets, which can effectively restrain the Mn dissolution. The Li0.93Mn2O4 (LMO-1) nanosheets delivers much larger Li+ diffusion coefficient (2.50 x 10(-11) cm(2) s(-1)) and much higher discharge capacity (124.6 mAh g(-1) at 0.1 C) than that of commercial particles (104.1 mAh g(-1), 2.97 x 10(-12) cm (2) s(-1)) and makes the discharge capacity approaching the theoretical capacity (138.24 mAh g(-1)). Moreover, the obtained Li0.93Mn2O4 nanosheets have high initial coulombic efficiency (99.6%) and 92% capacity retentions up to 100 cycles, indicating high reversible performance. (C) 2018 Elsevier B.V. All rights reserved.