Seyedeh Nooshin Banitaba , Dariush Semnania, Elahe Heydari-Soureshjanic , Waqas Ul Arifeend, Tae Jo Kod, Behzad Rezaeic , Ali A. Ensafic , Masoud Latifia , Ebrahim Mostafavie , Ajeet Kaushik
Journal of Alloys and Compounds, Volume 924, 30 November 2022, 166482, https://www.sciencedirect.com/science/article/abs/pii/S0925838822028730
Electrospun fibrous materials are promising electrolytic candidates suitable for all-solid-state lithium batteries (ASSLBs), owning to high ionic conductivity and energy density. However, the limited conductivity is yet to overcome and exploring chemistries for decorating them using electro-active filler of dopants is suggested by experts. In this direction, copper oxide (CuO), nickel oxide (NiO), and cobalt oxide (Co3O4) have also gained considerable attention due to their intriguing properties in various electrochemical devices. Herein, nano CuO, NiO, and Co3O4 were synthesized and used as the filler in the polyethylene oxide-based electrospun fibers to approach a proper electrochemical behavior. The obtained electrolytes were fully characterized using appropriate analytical systems. Based on the careful analysis of the results, incorporating 0.21 wt% nano CuO into the membrane led to approaching the most desirable characteristics by showing a higher concentration of free Li+ ions, greater amorphous domains, and lower Tg. Therefore, the highest ionic conductivity of 0.32 mS cm−1 was achieved at 25 °C. In addition, the CuO-filled fibers resulted in the activation energy drop from 53 to 19 kJ mol−1. The observed trends were confirmed through the estimation of dielectric and electrical properties. In a Li|LiCoO2 half-cell, reversible CV curves after 25 cycles as well as a stable structure up to 5.00 V were attained for the filled electrospun fibers. More significantly, the presence of CuO nanoparticles caused the discharge capacity increment from 68 to 120 mA h g−1 at 0.5 C for up to 100 cycles. Overall, the upgraded designing of the electrospun fibers through embedding the filler particles opens an influential way toward high-performance ASSLBs with appropriate safety.
Keywords: Electrospun polymer electrolyte All-solid-state lithium battery Copper oxide Nickel oxide Cobalt oxide