Facile Synthesis of Porous MnO Microspheres for High‐Performance Lithium‐Ion Batteries

Abstract

Manganese oxide is a highly promising anode material of lithium‐ion batteries (LIBs) for its low insertion voltage and high reversible capacity. Porous MnO microspheres are prepared by a facile method in this work. As an anode material of LIB, it can deliver a high reversible capacity up to 1234.2 mA h g−1 after 300 cycles at 0.2 C, and a capacity of 690.0 mA h g−1 in the 500th cycle at 2 C. The capacity increase with cycling can be attributed to the growth of reversible polymer/gel‐like film, and the better cycling stability and the superior rate performance can be attributed to the featured structure of the microspheres composed of nanoparticles with a short transport path for lithium ions, a large specific surface, and material/electrolyte contact area. The results suggest that the porous MnO microspheres can function as a promising anode material for high‐performance LIBs.

Walnut‐Like Multicore–Shell MnO Encapsulated Nitrogen‐Rich Carbon Nanocapsules as Anode Material for Long‐Cycling and Soft‐Packed Lithium‐Ion Batteries

“…Thus, extensive efforts have been dedicated to developing advanced anode materials with higher capacity, such as IVA‐group materials, metal sulfides, and metal oxides . Metal oxides, such as MnO x , have attracted much attention as potential anode materials due to the low electromotive force value, high theoretical capacity, as well as their environmental friendliness and abundance. Nevertheless, there are two major issues that impede their application: (1) The inferior electronic conductivity of metal oxides is unfavorable for the electrochemical lithium ion insertion/extraction reactions.…”

“…Therefore, the rational design and realization of hybrid nanostructures are required to improve the electrochemical performances. To this end, intensive attention has been paid to the controllable nanoengineering of metal oxide‐based ultrafine nanostructures . These nanostructures can improve the contacts of electrode–electrolyte interface, shorten the path for lithium‐ion diffusion within active material particles, and alleviate the structural strain of volume change during the repeating Li + insertion/extraction processes.…”

Hierarchically Pomegranate‐Like MnO@porous Carbon Microspheres as an Enhanced‐Capacity Anode for Lithium‐Ion Batteries

“…[1][2][3][4][5] However, due to low theoretical capacity (372 mAh g À 1 ) and small interlayer distance (0.34 nm) of commercial graphite anode, current commercial LIBs are almost reaching to performance limitation. [9][10][11][12][13][14][15][16][17][18] Particularly, MnO have attracted much attention as anode material for LIBs due to its high theoretical capacity of 756 mAh g À 1 , low voltage hysteresis of < 0.8 V, environmental friendliness and natural abundance in earth. Among various materials, transition-metal oxides (M x O y , M = Mn, Co, Fe, V and Ni) are promising in high-performance anode materials due to high theoretical specific capacity and low electromotive force value.…”

“…Among various materials, transition-metal oxides (M x O y , M = Mn, Co, Fe, V and Ni) are promising in high-performance anode materials due to high theoretical specific capacity and low electromotive force value. [9][10][11][12][13][14][15][16][17][18] Particularly, MnO have attracted much attention as anode material for LIBs due to its high theoretical capacity of 756 mAh g À 1 , low voltage hysteresis of < 0.8 V, environmental friendliness and natural abundance in earth. [19,20] Nevertheless, similar to other transition-metal oxides materials, MnO has also suffers from drastic volume changes and low electrical conductivity during repeated lithium insertion/extraction processes, thereby leading to inferior electrochemical performance.…”

Fast Preparation of Porous MnO/C Microspheres as Anode Materials for Lithium-Ion Batteries

“…Many strategies have been adopted to overcome these shortcomings, such as downsizing the particle size [14,15], designing new morphologies [16,17], doping [18][19][20][21][22], carbon coating [23][24][25][26][27], and constructing hollow or porous structures [28][29][30][31][32][33].…”