Manganese Cobalt Oxide (MnCo₂O₄) Hollow Spheres as High Capacity Anode Materials for Lithium‐Ion Batteries

Abstract

Ternary metal oxides are considered as promising anode materials for lithium‐ion batteries (LIBs), because they can circumvent the shortcomings of single‐component oxides. Herein, a facile hydrothermal route combined with calcination is used to fabricate manganese cobalt oxide (MnCo2O4) hollow spheres comprised of many mesoporous nanosheets. When used as anode material, the MnCo2O4 hollow spheres display excellent electrochemical properties. A specific capacity of 1023 mAh g−1 can be achieved after 200 cycles at a current density of 200 mA g−1. Even at a high current density of 5000 mA g−1, a reversible discharge capacity as high as 755 mAh g−1 can be achieved.

Facile Synthesis of Flower‐Like MnCo2O4@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

“…[44][45][46] In the initial oxidation process, a series of burr peaks located between 1.0 and 2.0 V are related to the oxidation of metallic Mn and Co to Mn 2 + and Co 2 + . [47][48][49] In the subsequent cycles, these peaks all exist and move slightly. The above results indicate that a phase transfer process occurs during the electrode reactions of manganese and cobalt oxide.…”

“…The strong peak at 0.01 V corresponds to the lithium intercalation process of carbon materials and to the further reduction of some metal ions into manganese and cobalt . In the initial oxidation process, a series of burr peaks located between 1.0 and 2.0 V are related to the oxidation of metallic Mn and Co to Mn 2+ and Co 2+ . In the subsequent cycles, these peaks all exist and move slightly.…”

Carbon‐Encapsulated SnO2 Core–Shell Nanowires Directly Grown on Reduced Graphene Oxide Sheets for High‐Performance Li‐Ion Battery Electrodes

“…Recently, Si, Ge, and other metal oxide compounds have attracted scientific attention as promising alternatives to replace the conventional graphite‐based anode materials and are expected to open up a new way toward the high energy/power density battery systems . However, in spite of the superior theoretical charge/discharge capacity of such materials when compared to graphitic ones, their large volume expansion during repetitive lithiation/delithiation processes unfortunately results in poor cycling performance, and they also suffer from intrinsically low electrical conductivity, which obstructs the practical implementation of these electrode materials.…”

“…[5][6][7] Recently,S i, Ge,a nd other metal oxide compounds have attracted scientific attentiona sp romising alternativest or eplace the conventional graphite-based anode materials and are expected to open up an ew way toward the high energy/ power density battery systems. [8][9][10][11] However, in spite of the superiortheoretical charge/discharge capacity of such materials when compared to graphitic ones,t heir large volume expansion during repetitive lithiation/delithiation processes unfortunately results in poor cycling performance,a nd they also suffer from intrinsically low electrical conductivity, which obstructs the practical implementation of these electrode materials.O ver the past few years,anumber of studies have focused on carbon-based additives (e.g.,c arbon nanoparticles, carbon nanotubes,a nd graphene nanosheets) in order to resolve the intrinsic issues of the electrodem aterials because the carbon additive materials can offer conductive pathways and flexible buffer matrices,t hereby improving the charge/discharge cycling behaviorso ft he electrodem aterials. [12][13][14][15][16][17][18][19][20] However, in most cases,t he electrode materials with such carbon additives have been processed into heavy slurry composites togetherw ith conductive enhancers and polymeric binders,and the slurry mixtures have been casted onto current collectors.…”

Metal‐Organic‐Framework‐Derived MCo2O4 (M=Mn and Zn) Nanosheet Arrays on Carbon Cloth as Integrated Anodes for Energy Storage Applications

“…(3)), respectively, along with the decomposition of organic electrolyte and the formation of the solid electrolyte interphase (SEI). , [34] [42][43][44] In the anodic scan, two oxidation peaks at~1.50 and~2.05 V can be attributed to the oxidation of Mn and Co, respectively, corresponding to Eq. (2)-(5).…”