Copper Doped Hollow Structured Manganese Oxide Mesocrystals with Controlled Phase Structure and Morphology as Anode Materials for Lithium Ion Battery with Improved Electrochemical Performance

Abstract

We develop a facile synthesis route to prepare Cu doped hollow structured manganese oxide mesocrystals with controlled phase structure and morphology using manganese carbonate as the reactant template. It is shown that Cu dopant is homogeneously distributed among the hollow manganese oxide microspherical samples, and it is embedded in the lattice of manganese oxide by substituting Mn(3+) in the presence of Cu(2+). The crystal structure of manganese oxide products can be modulated to bixbyite Mn2O3 and tetragonal Mn3O4 in the presence of annealing gas of air and nitrogen, respectively. The incorporation of Cu into Mn2O3 and Mn3O4 induces a great microstructure evolution from core-shell structure for pure Mn2O3 and Mn3O4 samples to hollow porous spherical Cu-doped Mn2O3 and Mn3O4 samples with a larger surface area, respectively. The Cu-doped hollow spherical Mn2O3 sample displays a higher specific capacity of 642 mAhg(-1) at a current density of 100 mA g(-1) after 100 cycles, which is about 1.78 times improvement compared to that of 361 mA h g(-1) for the pure Mn2O3 sample, displaying a Coulombic efficiency of up to 99.5%. The great enhancement of the electrochemical lithium storage performance can be attributed to the improvement of the electronic conductivity and lithium diffusivity of electrodes. The present results have verified the ability of Cu doping to improve electrochemical lithium storage performances of manganese oxides.

Hierarchical Mn2O3 Hollow Microspheres as Anode Material of Lithium Ion Battery and Its Conversion Reaction Mechanism Investigated by XANES

“…[30][31][32][33] By analyzing the electrochemical results, on the contrary, Deng et al speculated that porous Mn 2 O 3 microspheres could be oxidized to Mn 3+ after charging to 3 V. 34 It is still a challenge so far to make clear the conversion reaction mechanism and capacity fading of the 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 technique to characterize the valence state of element in compounds, [35][36] and it was applied in this study to investigate the conversion reaction mechanism and the origin of capacity fading of Mn 2 O 3 electrodes.…”

Selective Growth of Co-electrodeposited Mn2O3-Au Spherical Composite Network Towards Enhanced Non-enzymatic Hydrogen Peroxide Sensing

“…Characteristics like high surface to volume ratio, surface modification, chemical functionalization and doping etc. are encouraging for the design and fabrication of new nanostructured materials for efficient device performance [2,3,4]. Among the different sensing applications electrocatalytic property of oxide nanomaterials has drawn tremendous attention due to their application in sensing electroactive analytes such as H 2 O 2 [5], glucose [6], dopamine [7] and uric acid [8] etc.…”

Enhancement in electrochemical behavior of copper doped MnO2 electrode

“…The electrochemical characterizations were carried out as mentioned in the previous work [8]. [10]. Especially the Cu 2p spectrum exhibits two distinguished peaks at 933.6 eV and 953.6 eV corresponding to Cu 2p 3/2 and Cu 2p 1/2 levels respectively (Fig.…”