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

Abstract In this work, spinel Li x Mn 2 O 4 with high crystallinity are successfully synthesized via a simple polyol-reflux process. Li 0.93 Mn 2 O 4 shows ultrathin nanosheets structure (4 nm in thickness) with exposed {1 1 1} facets, which can effectively restrain the Mn dissolution. The Li 0.93 Mn 2 O 4 (LMO-1) nanosheets delivers much larger Li + diffusion coefficient (2.50 × 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 × 10 −12  cm 2  s −1 ) and makes the discharge capacity approaching the theoretical capacity (138.24 mAh g −1 ). Moreover, the obtained Li 0.93 Mn 2 O 4 nanosheets have high initial coulombic efficiency (99.6%) and 92% capacity retentions up to 100 cycles, indicating high reversible performance.