Synthesis, spectral character, electrochemical performance and in situ structure studies of Li1+xV3O8 cathode material prepared by tartaric acid assisted sol–gel process
| Autor: | Feng Lin, Liangliang Chen, Dan Xu, Gao Shan, Yuanlong Ren, Jie Shu, Weidong Zheng, Qingchun Wang, Miao Shui |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Mechanical Engineering Inorganic chemistry Infrared spectroscopy chemistry.chemical_element Condensed Matter Physics Microstructure Electrochemistry chemistry.chemical_compound chemistry Mechanics of Materials Differential thermal analysis X-ray crystallography Tartaric acid General Materials Science Lithium Sol-gel Nuclear chemistry |
| Zdroj: | Materials Research Bulletin. 47:2455-2459 |
| ISSN: | 0025-5408 |
| Popis: | Lithium-ion battery cathode material Li 1+ x V 3 O 8 was synthesized by a tartaric acid assisted sol–gel method and thermally treated at 350 °C, 450 °C and 550 °C for 3 h for the formation of Li 1+ x V 3 O 8 phase. The synthesized samples were fully characterized by FTIR, TG/DTA, XRD and charge–discharge tests. Li 1+ x V 3 O 8 material synthesized by tartaric acid assisted route, followed by heat treatment at 450 °C for 3 h shows best electro-chemical performance. It shows a high initial capacity of 249 mAh g −1 and still reserves a discharge capacity of 260 mAh g −1 after 50 cycles. Moreover, for all tartaric assisted products, no capacity decadence is observed in 50 cycles. The in situ X-ray measurements reveal a two-phase transition mechanism in the lithium intercalation/deintercalation process. During lithium extraction, the structure of the delithiated compound changes from Li 4 V 3 O 8 ( x > 3.1) to the original LiV 3 O 8 phase ( x x a axis and a slight expansion along b axis are also observed. |
| Databáze: | OpenAIRE |
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