Dataset Information

A Convenient Synthesis Route for Co₃O₄ Hollow Microspheres and Their Application as a High Performing Anode in Li-Ion Batteries.

ABSTRACT: A new, rapid, and cost-effective method for synthesizing hollow microspheres (HMSs) of cobalt oxide (Co₃O₄) using the phloroglucinol-formaldehyde gel route is reported here. Further, the synthesized hollow Co₃O₄ microspheres were investigated as an anode material for Li-ion batteries. The Co₃O₄ hollow spheres exhibited excellent electrochemical performance and cycling stability, for example, a capacity of 915 mA h g^-1 was obtained at 1 C rate over 350 cycles. The material also exhibited good performance at high rates, viz., capacities of 500, 350, and 250 mA h g^-1 at 10 C, 25 C, and 50 C, respectively, with good capacity retention over 500 cycles. The excellent electrochemical performance of Co₃O₄ can be ascribed to the porous nanoarchitecture that provides a short diffusion length for Li⁺ ions and high electrolyte percolation in the porous structure. Additionally, the thin porous wall of the nanocages provides an effective way to overcome the issues associated with the volume change occurring during Li charge/discharge. The conversion of Co₃O₄ into Co upon discharge was also probed by measuring the magnetic properties.

SUBMITTER: Gurunathan P

PROVIDER: S-EPMC6644945 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Publications

A Convenient Synthesis Route for Co3O4 Hollow Microspheres and Their Application as a High Performing Anode in Li-Ion Batteries.

Gurunathan Padalingam P Ette Pedda Masthanaiah PM Lakshminarasimhan Narayanan N Ramesha Kannadka K

ACS omega 20171107 11

A new, rapid, and cost-effective method for synthesizing hollow microspheres (HMSs) of cobalt oxide (Co3O4) using the phloroglucinol-formaldehyde gel route is reported here. Further, the synthesized hollow Co3O4 microspheres were investigated as an anode material for Li-ion batteries. The Co3O4 hollow spheres exhibited excellent electrochemical performance and cycling stability, for example, a capacity of 915 mA h g-1 w ...[more]

PMID: 31457322

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Project description:A SnO2/Ni/CNT nanocomposite was synthesized using a simple one-step hydrothermal method followed by calcination. A structural study via XRD shows that the tetragonal rutile structure of SnO2 is maintained. Further, X-ray photoelectron spectroscopy (XPS) and Raman studies confirm the existence of SnO2 along with CNTs and Ni nanoparticles. The electrochemical performance was investigated via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge measurements. The nanocomposite has been used as an anode material for lithium-ion batteries. The SnO2/Ni/CNT nanocomposite exhibited an initial discharge capacity of 5312 mA h g-1 and a corresponding charge capacity of 2267 mA h g-1 during the first cycle at 50 mA g-1. Pristine SnO2 showed a discharge/charge capacity of 1445/636 mA h g-1 during the first cycle at 50 mA g-1. This clearly shows the effects of the optimum concentrations of CNTs and Ni. Further, the nanocomposite (SnNiCn) shows a discharge capacity as high as 919 mA h g-1 after 210 cycles at a current density of 400 mA g-1 in a Li-ion battery set-up. Thus, the obtained capacity from the nanocomposite is much higher compared to pristine SnO2. The higher capacity in the nanoheterostructure is due to the well-dispersed nanosized Ni-decorated stabilized SnO2 along with the CNTs, avoiding pulverization as a result of the volumetric change of the nanoparticles being minimized. The material accommodates huge volume expansion and avoids the agglomeration of nanoparticles during the lithiation and delithiation processes. The Ni nanoparticles can successfully inhibit Sn coarsening during cycling, resulting in the enhancement of stability during reversible conversion reactions. They ultimately enhance the capacity, giving stability to the nanocomposite and improving performance. Additionally, the material exhibits a lower Warburg coefficient and higher Li ion diffusion coefficient, which in turn accelerate the interfacial charge transfer process; this is also responsible for the enhanced stable electrochemical performance. A detailed mechanism is expressed and elaborated on to provide a better understanding of the enhanced electrochemical performance.

Dataset Information

A Convenient Synthesis Route for Co₃O₄ Hollow Microspheres and Their Application as a High Performing Anode in Li-Ion Batteries.

Publications

A Convenient Synthesis Route for Co<sub>3</sub>O<sub>4</sub> Hollow Microspheres and Their Application as a High Performing Anode in Li-Ion Batteries.

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