Highly Porous Mn₃O₄ Micro/Nanocuboids with In Situ Coated Carbon as Advanced Anode Material for Lithium‐Ion Batteries

Abstract

The electrochemical performance of most transition metal oxides based on the conversion mechanism is greatly restricted by inferior cycling stability, rate capability, high overpotential induced by the serious irreversible reactions, low electrical conductivity, and poor ion diffusivity. To mitigate these problems, highly porous Mn O micro/nanocuboids with in situ formed carbon matrix (denoted as Mn O @C micro/nanocuboids) are designed and synthesized via a one-pot hydrothermal method, in which glucose plays the roles of a reductive agent and a carbon source simultaneously. The carbon content, particle size, and pore structure in the composite can be facilely controlled, resulting in continuous carbon matrix with abundant pores in the cuboids. The as-fabricated Mn O @C micro/nanocuboids exhibit large reversible specific capacity (879 mAh g at the current density of 100 mA g ) as well as outstanding cycling stability (86% capacity retention after 500 cycles) and rate capability, making it a potential candidate as anode material for lithium-ion batteries. Moreover, this facile and effective synthetic strategy can be further explored as a universal approach for the synthesis of other hierarchical transition metal oxides and carbon hybrids with subtle structure engineering.

Nano-Sized Iron Sulfide: Structure, Synthesis, Properties, and Biomedical Applications

“…Fe 7 S 8 /N-C nanohybrids were prepared for FeMOF and FeMOF-S and analyzed by FTIR (Jin et al, 2019 ). In addition, energy dispersive spectroscopy (EDS) (Paolella et al, 2011 ; Ding et al, 2016 ; Guo et al, 2016 ), dynamic light scattering (DLS) (He et al, 2013 ; Ding et al, 2016 ), Raman spectroscopy (Gan et al, 2016 ; Guo et al, 2016 ), selected area electron diffraction (SAED) (Kar and Chaudhuri, 2004 ), X-ray absorption fine structure (XAFS) (Feng et al, 2013 ), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) (Jin et al, 2019 ), nitrogen adsorption–desorption isotherms and pore size distribution (Guo et al, 2016 ) analysis of iron sulfide have been reported as characterization systems.…”

A Double‐Buffering Strategy to Boost the Lithium Storage of Botryoid MnOx/C Anodes

“…To overcome the above problems of MnO x (as well as other TMOs), many solutions have been attempted and can be majorly classified into two strategies: nanostructuring and carbon‐compositing . The former, by developing diverse nanostructures such as nanoparticles, nanosheets, nanocages, nanofibers, nanocubes, etc., brings in numerous benefits such as shortened ion diffusion path, enlarged electrochemically active surface, promoted electrolyte infiltration, as well as relieved lattice stress . The latter, by hybridizing with various kinds of carbonaceous materials including graphene, carbon nanotubes, carbon nanofibers, and amorphous carbon, etc., enables to greatly enhance electronic conductivity, buffer the cyclic volume fluctuation, and reinforce the electrode stability by providing structural supports for the active materials …”

Nitrogen-Doped Porous Co3O4/Graphene Nanocomposite for Advanced Lithium-Ion Batteries

“…Many transition metal oxides [7,8,9,10] show potential as promising anode candidates for LIBs by reason of their better theoretical capacity, high power density, and easy accessibility [11,12]. Among these materials, Co 3 O 4 is a potential anti-ferromagnetic p-type semiconductor with a spinel crystal structure, which can coordinate with eight lithium ions per single lattice and deliver a higher theoretical capacity of 890 mAh·g −1 [13,14].…”