Facile synthesis of loaf-like ZnMn2O4 nanorods and their excellent performance in Li-ion batteries

Abstract

Binary transition metal oxides have been attracting extensive attention as promising anode materials for lithium-ion batteries, due to their high theoretical specific capacity, superior rate performance and good cycling stability. Here, loaf-like ZnMn2O4 nanorods with diameters of 80-150 nm and lengths of several micrometers are successfully synthesized by annealing MnOOH nanorods and Zn(OH)2 powders at 700 °C for 2 h. The electrochemical properties of the loaf-like ZnMn2O4 nanorods as an anode material are investigated in terms of their reversible capacity, and cycling performance for lithium ion batteries. The loaf-like ZnMn2O4 nanorods exhibit a reversible capacity of 517 mA h g(-1) at a current density of 500 mA g(-1) after 100 cycles. The reversible capacity of the nanorods still could be kept at 457 mA h g(-1) even at 1000 mA g(-1). The improved electrochemical performance can be ascribed to the one-dimensional shape and the porous structure of the loaf-like ZnMn2O4 nanorods, which offers the electrode convenient electron transport pathways and sufficient void spaces to tolerate the volume change during the Li(+) intercalation. These results suggest the promising potential of the loaf-like ZnMn2O4 nanorods in lithium-ion batteries.

Synthesis and characterization of urchin-like Mn 0.33 Co 0.67 C 2 O 4 for Li-ion batteries: Role of SEI layers for enhanced electrochemical properties

“…Transition metal oxides (e.g., Fe 2 O 3 , Co 3 O 4 , MnO 2 , and CuO) have been widely investigated as alternative high-capacity anode materials for LIBs, owing to their electrochemical conversion reactions which utilize all possible oxidation states of their constituent transition metals [4][5][6][7]. Furthermore, binary transition-metal oxides (BTMOs), such as MnCo 2 O 4 , ZnCo 2 O 4 , ZnMn 2 O 4 , and CoFe 2 O 4 , have shown good electrochemical performance, owing to their complex chemical compositions and their synergetic effects [8][9][10][11]. However, the wide commercialization of transition metal oxides in applications such as large-scale energy storage is hindered by cost and environmental concerns such as their high heavy metal content.…”

Facile and template-free synthesis of spherical Cu2O as anode materials for lithium-ion batteries

“…Metal oxide nanomaterials, especially transition metal oxides (CuO, Fe 2 O 3 , Co 3 O 4 , MnO 2 , et al) have attracted great attention as anode materials for lithium-ion batteries because of their excellent properties, not only their good capacity retention property, safety in operation, environmental friendliness and inexpensiveness, but also their high theoretical capacity, compared to conventional anode materials graphite [1][2][3][4]. Cuprous oxide (Cu 2 O), another important transition metal oxide, as a reddish p-type semiconductor with a direct forbidden band gap 2.17 eV, has a various applications in photo-catalysis [5], sensors [6], solar cells [7], CO oxidation, and lithium-ion batteries [8].…”

Electrochemical Studies of Microwave Synthesised Bimetallic Sulfides Nanostructures As Faradaic Electrodes.

“…To address this issue and improved on the electrochemical performance, mixed metal oxides, transition metal sulfides including both binary and ternary materials with stoichiometric composition have recently been investigated as novel pseudocapacitive materials for supercapacitors due to their outstanding electrochemical properties, rich redox reactions involving different ions, complex chemical compositions and their synergetic effects [13][14][15][16][17]. Compared to single and simple metal oxides, mixed metal oxides or sulfides exhibit variable oxidation state, high electrical conductivity due to lower activation energy for electron transfer between cations [18][19][20].…”