Novel NiCo 2 O 4 nanofibers prepared via electrospinning method as host materials for perfect polysulfide inhibition
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ORIGINAL PAPER
Novel NiCo2O4 nanofibers prepared via electrospinning method as host materials for perfect polysulfide inhibition Jie Luo 1 & Jianming Zheng 2 Received: 5 November 2020 / Revised: 12 November 2020 / Accepted: 14 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Lithium-sulfur batteries have been widely studied as promising energy storage system due to their high specific capacity and energy density. However, the poor electronic conductivity and severe polysulfide shuttle effect still hinder the practical applications of lithium-sulfur batteries. Therefore, improving the electronic conductivity and inhibiting the polysulfide migration are still the hot research topic in lithium-sulfur batteries. In this work, ternary metal oxide NiCo2O4 nanofibers are designed as novel sulfur host for high-performance lithium-sulfur batteries. On the one hand, the polar NiCo2O4 could provide sufficient active site for anchoring the soluble polysulfide. On the other hand, the high electronic conductivity of NiCo2O4 nanofibers could adequately activate insulated sulfur and improve the specific capacity and rate capability of lithium-sulfur batteries. As a result, the as-prepared NiCo2O4 nanofibers/S (NCO-NFs/S) composite cathodes exhibit initial specific capacity of 1238 mAh g−1 at 0.2 C. Moreover, the specific capacity of 706 mAh g−1 could be obtained after 500 cycles at 1 C for the NCO-NFs/S composites. Keywords Metal oxides . NiCo2O4 . Electrochemical performance . Shuttle effect . Li-S batteries
Introduction Owing to the increasing demand for high energy density energy storage devices, lithium-sulfur (Li-S) batteries have drawn much attention for the researchers due to their high theoretical specific capacity (1675 mAh g−1) and energy density (2600 Wh Kg−1), which is about five times higher than the traditional lithium-ion batteries [1–4]. Besides, elemental sulfur is low cost, abundant, and environment friendly [5, 6]. However, there are also some defects to limit the practical applications of Li-S batteries, including poor electronic conductivity of element sulfur and discharge products, the severe polysulfide shuttle effect, and the volume change upon cycles [7–9]. These problems finally lead to low specific capacity, rapid capacity fading, and poor rate capability [10]. Consequently, the efficient method to modify the electrochemical performance of Li-S batteries is to improve the * Jie Luo [email protected] 1
School of Mechanical Engineering, Xijing University, Xi’an 710123, China
2
School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China
electronic conductivity of the cathode and inhibit the shuttle effect of the soluble polysulfide at the same time [11–13]. To overcome these mentioned challenges, many strategies have been employed to design the suitable host materials and the structures for the element sulfur. Nazar et al. firstly developed porous carbon (CMK3) as sulfur host material to enhance the cycle life an
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