Synthesis of Spherical Silver-coated Li4Ti5O12 Anode Material by a Sol-Gel-assisted Hydrothermal Method
| Autor: | Li Jun, Shaofang Li, Shuaijun Xu, Lu Lu, Si Huang, Lan Lifang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Lithium-ion batteries
Materials science Nanochemistry Nanotechnology 02 engineering and technology engineering.material 010402 general chemistry Electrochemistry 01 natural sciences Hydrothermal circulation chemistry.chemical_compound Coating Silver coating lcsh:TA401-492 General Materials Science Sol-gel Electrochemical performance 021001 nanoscience & nanotechnology Condensed Matter Physics Li4Ti5O12/Ag 0104 chemical sciences Dielectric spectroscopy Silver nitrate chemistry Chemical engineering engineering lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Ethylene glycol |
| Zdroj: | Nanoscale Research Letters, Vol 12, Iss 1, Pp 1-9 (2017) |
| ISSN: | 1931-7573 |
| DOI: | 10.1186/s11671-017-2342-z |
| Popis: | ᅟ Ag-coated spherical Li4Ti5O12 composite was successfully synthesized via a sol-gel-assisted hydrothermal method using an ethylene glycol and silver nitrate mixture as the precursor, and the influence of the Ag coating contents on the electrochemical properties of its was extensively investigated. X-ray diffraction (XRD) analysis indicated that the Ag coating does not change the spinel structure of Li4Ti5O12. The electrochemical impedance spectroscopy (EIS) analyses demonstrated that the excellent electrical conductivity of the Li4Ti5O12/Ag resulted from the presence of the highly conducting silver coating layer. Additionally, the nano-thick silver layer, which was uniformly coated on the particles, significantly improved this material’s rate capability. As a consequence, the silver-coated micron-sized spherial Li4Ti5O12 exhibited excellent electrochemical performance. Thus, with an appropriate silver content of 5 wt.%, the Li4Ti5O12/Ag delivered the highest capacity of 186.34 mAh g−1 at 0.5C, which is higher than that of other samples, and maintained 92.69% of its initial capacity at 5C after 100 cycles. Even at 10C after 100 cycles, it still had a capacity retention of 89.17%, demonstrating remarkable cycling stability. Trial registration ISRCTN NARL-D-17-00568 |
| Databáze: | OpenAIRE |
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