Structural characterization and electrochemical properties of Co3O4 anode materials synthesized by a hydrothermal method

Abstract

Cobalt oxide [Co3O4] anode materials were synthesized by a simple hydrothermal process, and the reaction conditions were optimized to provide good electrochemical properties. The effect of various synthetic reaction and heat treatment conditions on the structure and electrochemical properties of Co3O4 powder was also studied. Physical characterizations of Co3O4 are investigated by X-ray diffraction, scanning electron microscopy, and Brunauer-Emmett-Teller [BET] method. The BET surface area decreased with values at 131.8 m2/g, 76.1 m2/g, and 55.2 m2/g with the increasing calcination temperature at 200°C, 300°C, and 400°C, respectively. The Co3O4 particle calcinated at 200°C for 3 h has a higher surface area and uniform particle size distribution which may result in better sites to accommodate Li+ and electrical contact and to give a good electrochemical property. The cell composed of Super P as a carbon conductor shows better electrochemical properties than that composed of acetylene black. Among the samples prepared under different reaction conditions, Co3O4 prepared at 200°C for 10 h showed a better cycling performance than the other samples. It gave an initial discharge capacity of 1,330 mAh/g, decreased to 779 mAh/g after 10 cycles, and then showed a steady discharge capacity of 606 mAh/g after 60 cycles.

Role of cobalt cations in short range antiferromagnetic Co3O4 nanoparticles: a thermal treatment approach to affecting phonon and magnetic properties

“…In the last decade, research on the effects of the finite size on the structural, optical and magnetic properties of Co 3 O 4 have attracted enormous attention because of its wide range of important potential applications as a gas sensor 1 , data storage 2 , magnetic semiconductors 3 , electrochemical devices 4 , heterogeneous catalysts 5 , anode materials in Li-ion rechargeable batteries 6 , solid-state sensors 3 , solar energy absorbers, pigments 7–9 etc. The functioning of all these devices is strongly influenced by the different sample synthesis methods 3 , point defects (such as cation or anion vacancies) 10 , their morphology (such as nanobelts, nanorods, nanospheres, nanocubes, nanowires and nanoflowers) and nanosized effect 11,12 .…”

Structural and electrochemical investigation of nanostructured C:TiO2–TiOF2 composite synthesized in plasma by an original method of pulsed high-voltage discharge

“…Graphite is characterized by availability, insignificant structural deformation (9-10%) during cycling, practical capacity almost equal to the theoretical value of 372 mA h g À1 (Eq. (1)) [7,8]. However, the extremely strong reactivity of Li x C 6 causes an irreversible reaction between lithiated graphite and electrolyte solution.…”

Superior electrochemical properties of Co3O4 yolk–shell powders with a filled core and multishells prepared by a one-pot spray pyrolysis

“…Co 3 O 4 yolk-shell powders exhibited a high initial discharge capacity of 548 mA h g À1 and retained their capacities very well, even at a high discharge rate of 10 000 mA g À1 .Cobalt oxide (Co 3 O 4 ) as an alternative anode material for lithium secondary batteries has been widely studied because of its high charge capacity. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] However, the capacity retention and rate capability of Co 3 O 4 are poor and should be improved for application in lithium secondary batteries. The electrochemical properties of transition metal oxides, including cobalt oxide, are strongly affected by their morphology and micro-/nanostructure because they determine the lithium ion diffusion properties.…”