Year-end Sale % OFF 
Abstract
Two different interlayers were introduced in lithium–sulfur batteries to improve the cycling stability with sulfur loading as high as 80% of total mass of cathode. Melamine was recommended as a nitrogen-rich (N-rich) amine component to synthesize a modified polyacrylic acid (MPAA). The electrospun MPAA was carbonized into N-rich carbon nanofibers, which were used as cathode interlayers, while carbon nanofibers from PAA without melamine was used as an anode interlayer. At the rate of 0.1 C, the initial discharge capacity with two interlayers was 983 mAh g−1, and faded down to 651 mAh g−1 after 100 cycles with the coulombic efficiency of 95.4%. At the rate of 1 C, the discharge capacity was kept to 380 mAh g−1 after 600 cycles with a coulombic efficiency of 98.8%. It apparently demonstrated that the cathode interlayer is extremely effective at shutting down the migration of polysulfide ions. The anode interlayer induced the lithium ions to form uniform lithium metal deposits confined on the fiber surface and in the bulk to strengthen the cycling stability of the lithium metal anode.
Highlights
The lithium–sulfur (Li–S) battery is one of the most promising candidates for its high energy density applications, especially in electric vehicles (EVs) due to its low-cost, nontoxic, surprising theoretical specific capacity and energy density of 1675 mAh g−1 and 2500 Wh kg−1, respectively [1,2]
The development of the lithium–sulfur battery for practical applications has been obstructed to date by a series of challenges, including the insulating nature of S8, large volume change during the intercalation process and the solubility of polysulfides as intermediate products in liquid electrolytes
We present a novel modified Li–S cell structure with N-doped carbon nanofibers as the cathode interlayer and polyimides-based (PI-based) carbon nanofibers as the anode interlayer
Summary
The lithium–sulfur (Li–S) battery is one of the most promising candidates for its high energy density applications, especially in electric vehicles (EVs) due to its low-cost, nontoxic, surprising theoretical specific capacity and energy density of 1675 mAh g−1 and 2500 Wh kg−1 , respectively [1,2]. One of the most effective methods is to import an interlayer or modify the separator, which means that the interlayer serves as a barrier to limit soluble polysulfide diffusion and localizes the active material within the cathode side. This in turn facilitates the reutilization of the entrapped active materials in the following cycles, improving the capacity retention and cyclic stability of the cells. Nickel foam [5], polypyrrole nanotubes film (PNTF) [6], Fe3 C/carbon nanofibers (CNF) [7], polypyrrole functional interlayer (PFIL) [8], microporous carbon paper [9,10], carbon paper [11], hollow carbon nanofiber/reduced graphene oxide [12], etc., can be utilized as interlayers in an Li–S
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
