Iron fluoride with excellent cycle performance synthesized by solvothermal method as cathodes for lithium ion batteries
| Autor: | Hongbo Shu, Qian Zhou, Xin Yi, Zichao Yan, Xianyou Wang, Jinli Tan, Haipeng Guo, Zhifeng Huang, Zhenhua Yang, Qiliang Wei, Hai Hu, Xiukang Yang, Li Liu |
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| Rok vydání: | 2014 |
| Předmět: |
High rate
Materials science Nanocomposite Renewable Energy Sustainability and the Environment Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Carbon black Cathode law.invention Ion chemistry law Iron fluoride Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry Wall thickness |
| Zdroj: | Journal of Power Sources. 251:75-84 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2013.11.004 |
| Popis: | Hollow prismatic/cylindric iron fluoride with a wall thickness of 0.1–0.5 μm and a length of 1–3 μm has been synthesized by a simple and mild solvothermal method. This compound with a mixed crystal structure of FeF3·3H2O and FeF3·0.33H2O, has an initial discharge capacities of 106.7 mAh g−1 and a capacity retention of 60% after 100 cycles at the rate of 0.5C (1 C is 237 mA g−1) in the voltage of 2.0–4.5 V. To overcome the poor electronic conductivity of fluorides, the as-prepared iron fluoride has been ball-milled with 15 wt.% acetylene black (AB) and heat-treated to obtain FeF3·0.33H2O/C nanocomposites. The nanocomposites deliver discharge capacity of 160.2 mAh g−1 at the rate of 0.5C. Even at the high rate of 5 C, the initial discharge capacity is still as high as 137.5 mAh g−1. The capacity retentions reach up to 85.0% and 75.7% after 100 cycles at 0.5 C and 5 C, respectively. |
| Databáze: | OpenAIRE |
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