Mn oxidation state controllable spinel manganese-based intergrown cathode for excellent reversible lithium storage

摘要

Herein we report a novel hierarchical porous hollow cube-shaped 5 V spinel manganese-based intergrown cathode materials with controlling the average oxidation state of Mn. The equal proportion of LiNi0.5Mn1.5O4 and LiMn2O4 (LiMn1.75Ni0.25O4) intergrown cathode materials exhibit the most excellent electrochemical performance with the initial discharge capacity and energy density as high as 141.7 mAh g(-1) and 627.8 Wh Kg(-1) at 1 C. What's more, even though cells are performed at elevated temperature and encounter with intermittent high rate load, considerably superior cycle stabilities still are retained. The LMO/LNMO-1/1 yields the primal discharge capacity of 142.5 mAh g(-1) and 140.8 mAh g(-1), with 93.1% and 92.9% capacity retention up to 50 cycles at 55 degrees C and subjecting to intermittent 5 C discharge and charge load every five cycles, respectively. (C) 2017 Elsevier B.V. All rights reserved.