Importance of nanostructure for reversible Li-insertion into octahedral sites of LiNi0.5Mn1.5O4 and its application towards aqueous Li-ion chemistry

作者：Arun Nagasubramanian; Aravindan Vanchiappan^*; Ling Wong Chui; Madhavi Srinivasan

来源：Journal of Power Sources, 2015, 280: 240-245.

DOI：10.1016/j.jpowsour.2015.01.095

• Aqueous Li-ion battery
• Li[Ni0.5Mn1.5]O-4
• Electrospinning
• Octahedral Li-insertion

We demonstrate the significance of nanostructuring on the reversible Li-insertion into octahedral sites of the nickel substituted spinel Li[Ni0.5Mn1.5]O-4. One dimensional nanofibers (50-250 nm diameter) of the Li[Ni0.5Mn1.5]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 x 10(-11) cm(2) s(-1)) than that of conventional powders (1.22 x 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 similar to 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.

• 出版日期2015-4-15