Cubic nanocrystal constructed 3D porous LiMn2O4: Low-temperature pyrolysis formation and high-performance as a cathode material for aqueous hybrid capacitor
| Autor: | Juanjuan Xing, Jun Fan, Li-Li Yu, Jing-Tai Zhao, Gai-Di Fan, Wei-Ling Xu |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
aqueous lithium-ion cathode
Materials science Annealing (metallurgy) Lithium manganese oxides 02 engineering and technology Lithium acetate 010402 general chemistry 01 natural sciences law.invention chemistry.chemical_compound law Porous material lcsh:TA401-492 Crystallization Porosity Aqueous solution Metals and Alloys 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Nanocrystal Chemical engineering chemistry Solid pyrolysis lcsh:Materials of engineering and construction. Mechanics of materials Particle size 0210 nano-technology |
| Zdroj: | Journal of Materiomics, Vol 7, Iss 3, Pp 488-497 (2021) |
| ISSN: | 2352-8478 |
| Popis: | 3D porous nano-LiMn2O4 (nano-LMO) is successfully prepared at 250 °C by a low temperature pyrolysis, using porous MnO2 and lithium acetate as reactants. The as-formed porous samples are demonstrated to be constructed by well-defined and uniform cubic nanocrystals with particle sizes regulated from tens to hundreds of nanometers by adjusting the annealing temperature. Due to its proper particle size with perfect crystallization (∼50 nm) and rich pores, sample LMO-265, prepared at 265 °C, exhibits high performance as an aqueous lithium ion cathode. It can present a high specific capacity of 102 mAh g−1 at a current density of 5C with a greatly improved rate capability (57.3%, 68C) and capacity retention (70.7%, after 5000 cycles at 13.5C) in 1 M Li2SO4. When assembled with commercial used active carbon (AC) to form an aqueous hybrid capacitor, it can deliver a high energy density of 15.8 Wh kg−1 at a large power density of 9 kW kg−1 with a good cycling life of 71.6% after 5000 at 2 A g−1. Considering of its simple and economical preparation, as-prepared porous LMO can be regarded as a promising high-performance cathode material in aqueous electrolyte. |
| Databáze: | OpenAIRE |
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