Grinding–sol–gel synthesis and electrochemical performance of mesoporous Li3V2(PO4)3 cathode materials
| Autor: | You-Nian Liu, Su-qing Liu, Guo-cong Liu |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Metals and Alloys Analytical chemistry Sintering Geotechnical Engineering and Engineering Geology Condensed Matter Physics Electrochemistry Cathode law.invention Amorphous solid law Transmission electron microscopy Specific surface area Materials Chemistry Mesoporous material Sol-gel |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 23:439-444 |
| ISSN: | 1003-6326 |
| Popis: | Li 3 V 2 (PO 4 ) 3 precursor was obtained with V 2 O 5 · n H 2 O, LiOH·H 2 O, NH 4 H 2 PO 4 and sucrose as starting materials by grinding-sol-gel method, and then the monoclinic-typed Li 3 V 2 (PO 4 ) 3 cathode material was prepared by sintering the amorphous Li 3 V 2 (PO 4 ) 3 . The as-sintered samples were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), N 2 adsorption-desorption and electrochemical measurement. It is found that Li 3 V 2 (PO 4 ) 3 sintered at 700 °C possesses good wormhole-like mesoporous structure with the largest specific surface area of 188 cm 2 /g, and the smallest pore size of 9.3 nm. Electrochemical test reveals that the initial discharge capacity of the 700 °C sintered sample is 155.9 mA·h/g at the rate of 0.2 C , and the capacity retains 154 mA·h/g after 50 cycles, exhibiting a stable discharge capacity at room temperature. |
| Databáze: | OpenAIRE |
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