Microemulsion-based synthesis and electrochemical evaluation of different nanostructures of LiCoO₂prepared through sacrificial nanowire templates

Abstract

For the first time, we demonstrate the use of a microemulsion reaction to synthesize different nanostructures of LiCoO2 cathode material. By varying the annealing temperature and time, porous nanowires and nanoparticles of LiCoO2 are obtained. The electrochemical performances of these different nanostructures obtained under the respective annealing conditions are evaluated. It is shown that nanoparticles formed under the annealing condition of 700 °C, 1.5 h perform the best, delivering an initial capacity of around 135 mA h g(-1), which is close to the theoretical capacity of LiCoO2, 140 mA h g(-1). They also exhibit a capacity retention of around 93% by 100 cycles at 0.1 C. Comparisons are made between our LiCoO2 material obtained under different annealing conditions and those in the literature.

Nanosized Lithium-Rich Cobalt Oxide Particles and Their Transformation to Lithium Cobalt Oxide Cathodes with Optimized High-Rate Morphology

“…In the Supporting Information, we provide an overview of the relevant literature and how different procedures can be related to make the results more comparable. Taking all these considerations into account, the only publication reporting slightly better performance of LCO at rates of up to 15C is by Yadav et al 52 They used a microemulsion-derived HT-LCO, which exhibits discharge capacities of 123/118 mA h g −1 for 5C/10C. Our nanostructured HT-LCO demonstrates, however, better performances at very high charging rates, and at 20 and 50C, it demonstrates the highest capacity retention reported so far.…”

Porous One‐Dimensional Nanomaterials: Design, Fabrication and Applications in Electrochemical Energy Storage

“…[3] In forming microemulsions, cetyltrimethyl ammonium bromide (CTAB) is the most common surfactant used to form reverse micelles. NiCo 2 O 4 , [125] Ca 9 Co 12 O 28 , [126] and LiCoO 2 [127] porous nanowires were also obtained using the same synthesis approach but replacing/ adjusting the reaction sources. Reverse micelles containing Co 2+ coming in contact with C 2 O 4 2− resulted in the formation of precursor CoC 2 O 4 nuclei.…”

Synthesis and Applications of One-Dimensional Porous Nanowire Arrays: A Review

“…As the power of plasma increases, the reduction and etching of CuO is enhanced, so that the power of plasma treatments could be used to control the roughness and Cu 2 O/CuO ratio of the porous nanowires. Yadav et al 84 demonstrated the use of a typical microemulsion reaction to synthesize 1D porous LiCoO 2 nanowires. They¯rst used cetyltrimethylammonium bromide (CTAB), a surfactant, to direct the formation of nanowire precursors comprising lithium and cobalt oxalates.…”