Importance of nanostructure for reversible Li-insertion into octahedral sites of LiNi0.5Mn1.5O4 and its application towards aqueous Li-ion chemistry
| Autor: | Srinivasan Madhavi, Nagasubramanian Arun, Vanchiappan Aravindan, Wong Chui Ling |
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| Rok vydání: | 2015 |
| Předmět: |
Nanostructure
Aqueous solution Renewable Energy Sustainability and the Environment Spinel Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Electrolyte engineering.material Electrospinning Anode Nickel chemistry Nanofiber engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Journal of Power Sources. 280:240-245 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2015.01.095 |
| Popis: | We demonstrate the significance of nanostructuring on the reversible Li-insertion into octahedral sites of the nickel substituted spinel Li[Ni 0.5 Mn 1.5 ]O 4 . One dimensional nanofibers (50–250 nm diameter) of the Li[Ni 0.5 Mn 1.5 ]O 4 were prepared by a single spinneret electrospinning and their performance was compared with powders synthesized via a conventional solid state approach. Li-diffusion coefficient of electrospun fibers was an order of magnitude higher (5.8 × 10 −11 cm 2 s −1 ) than that of conventional powders (1.22 × 10 −12 cm 2 s −1 ). Galvanostatic studies revealed a much improved capacity and rate performance for electrospun fibers. The fibers delivered a reversible capacity of ∼87 mAh g −1 after 150 cycles at 1C rate compared to negligible capacity for solid-state prepared material. Finally, the performance of this nanostructured spinel phase as an anode in aqueous rechargeable Li-ion system was demonstrated to require a strongly alkaline electrolyte. |
| Databáze: | OpenAIRE |
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