| Autor: |
Kannadasan, Kalidoss, Sankar Devi, Vaithiyanathan, Archana, Suresh, Thomas, Paramanandam, Elumalai, Perumal |
| Předmět: |
|
| Zdroj: |
New Journal of Chemistry; 8/7/2023, Vol. 47 Issue 29, p13963-13978, 16p |
| Abstrakt: |
In this work, a spinel-type metal sulfide/oxide (NiCo2S4–NiCo2O4) composite in which NiCo2S4–NiCo2O4 anchored on graphene oxide was synthesized via a simple freeze-drying method was explored as an electrode for both supercapattery and lithium-ion battery applications. Materials characterization revealed the formation of a NiCo2S4–NiCo2O4 composite material. Electrochemical studies, including cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) cycling and electrochemical impedance spectroscopy (EIS), were performed for both the lithium-ion battery (LIB) and supercapattery in the form of a CR-2032 coin cell featuring the NiCo2S4–NiCo2O4 electrode. The lithium storage performance of the NiCo2S4–NiCo2O4 anode in a half-cell exhibited a high reversible capacity of 674 mA h g−1 at a rate of 0.2C with high reversibility and excellent cycling stability over 500 cycles at a rate of 1C. The supercapattery device delivered a high specific energy of 86 W h kg−1 at a specific power of 320 W kg−1 with excellent cycling stability and Coulombic efficiency. In both the LIB and supercapattery, using a power law and Dunn's method, deconvolution of the capacitive and the diffusive charge/lithium storage were examined. The high capacitive contribution was attributed to the nanostructured features of the freeze-dried composite material. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
