Improved electrochemical performances of LiOVPO4/ketjen black composite prepared by a novel solvent-thermal oxidation route
| Autor: | Haishen Song, Qingfeng Yi, Anping Tang, Fu Yangyang, Chen Juedong, Ronghua Peng, Guorong Xu, Hezhang Chen |
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| Rok vydání: | 2021 |
| Předmět: |
Thermal oxidation
Materials science Scanning electron microscope General Chemical Engineering Composite number General Engineering General Physics and Astronomy chemistry.chemical_element Sorption 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Nitrogen 0104 chemical sciences Solvent chemistry Chemical engineering General Materials Science Orthorhombic crystal system 0210 nano-technology |
| Zdroj: | Ionics. 27:2937-2943 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-021-04053-6 |
| Popis: | Orthorhombic β-LiVOPO4/ketjen black composite is obtained via a two-step chemical synthesis. In the first step, Li3V2(PO4)3-V2O3/ketjen black precursor is obtained by spray-drying process and subsequent heat treatment. Solvent-thermal oxidation of the precursor results in the complete formation of β-LiVOPO4/ketjen black composite. The synthesized composite is characterized by means of X-ray diffraction, scanning electron microscopy, nitrogen sorption, and electrochemical tests. Galvanostatic charge–discharge cycling of the composite shows an initial discharge specific capacity of 305, 289, 276, 242, 157, and 77 mAh·g−1 at C/20, C/10, C/5, C/2, 1C, and 2C rate in a voltage window of 2.0–4.5 V, respectively. At higher current rates, although it exhibits good retention of discharge capacity, the capacity is found to reduce with increasing current rates. The composite displays excellent cycling performance at a current rate of C/5 up to 50 cycles, which yields a high specific capacity of 245 mAh·g−1 at the end of the 50th cycle and a small capacity fading of 0.13% per cycle. |
| Databáze: | OpenAIRE |
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