Defect-rich conversion-based manganese oxide nanofibers: An ultra- high rate capable anode for next-generation binder-free rechargeable batteries

Recently, nanostructured materials with oxygen defects and their utilization as electrode materials for li-thium-ion batteries (LIBs) are gaining considerable popularity. However, it is still unclear how surface morphology, nanostructuring, and oxygen defects contribute to Li-storage characteristics. In view of this, the present research work is focused on the fabrication of one-dimensional, porous, and oxygen-deficient nanofibers of MgMn2O4 (MMO) through electrospinning technique, followed by their subsequent heat -treatment on various temperatures such as 450 degrees C, 600 degrees C, and 750 degrees C. A quantitative analysis of oxygen defects indicates that MMO-60 0 contains a high number of oxygen vacancies. Further, the binder-free electrodes of all the samples are fabricated via electrophoretic deposition technology and their Li-storage performance is investigated. As a binder-free LIB anode, MMO-60 0 exhibits excellent reversible specific capacity, rate capability, and cyclic stability (817 mAh g-1 after 500 cycles at 2 C) with -99% coulombic efficiency. Further, MMO-60 0 displays the capacity of 228 mAh g-1 at 10 C is found to be better than the MMO-450 and MMO-750. Additionally, the feasibility of MMO-60 0 is also investigated in full cell config-uration with a binder-free LiNi1/3Mn1/3Co1/3O2 cathode, which exhibited an energy density of 166 ( +/- 3) Wh kg-1.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

Recently, there has been increasing interest in using nanostructured materials with oxygen defects as electrode materials for lithium-ion batteries (LIBs). However, the relationship between surface morphology, nanostructuring, oxygen defects, and Li-storage characteristics remains unclear. In this study, one-dimensional, porous, and oxygen-deficient nanofibers of MgMn2O4 (MMO) were fabricated and analyzed for their Li-storage performance. The MMO-600 sample, which exhibited a high number of oxygen vacancies, showed excellent reversible specific capacity, rate capability, and cyclic stability as a binder-free LIB anode. Furthermore, MMO-600 demonstrated better capacity at high rates compared to MMO-450 and MMO-750. In addition, the feasibility of MMO-600 in a full cell configuration with a binder-free LiNi1/3Mn1/3Co1/3O2 cathode was investigated, showing promising energy density. (c) 2023 Elsevier B.V. All rights reserved.