High thermal stability multilayered electrolyte complexes via layer-by-layer for long-life lithium-sulfur battery
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ORIGINAL PAPER
High thermal stability multilayered electrolyte complexes via layer-by-layer for long-life lithium-sulfur battery Jing Wang 1 & Yufan Li 1 & Xianmei Deng 2 & Lei Yan 1 & Zhiqiang Shi 1 Received: 17 February 2020 / Revised: 17 June 2020 / Accepted: 7 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this work, polyacrylonitrile/sulfonated poly(ether ether ketone) (PAN/SPEEK) composite fiber membrane as separator for lithium-sulfur battery was first prepared by electrospinning. In order to reduce the shuttle effect, multilayered polyelectrolyte complexes (CS/CNTs)n as surface modification agents were prepared by alternating deposition of oppositely charged hydroxylated multi-walled carbon nanotubes (MWCNTs-COOH) and chitosan (CS) via the layer-by-layer method. The as-prepared fiber multilayered complex separator (FMCS) was finally treated by heating at 120 °C to form cross-linked network for better thermal stability. FMCS possessed much higher porosity than that of the commercial PP separator (44%). As expected, the assembled membranes remained intact even at 150 °C, while PP separator shrunk severely. Compared with PP, PAN/SPEEK/ (CS/MWNTs-COOH)10 showed the discharge capacity of 956.9 mAh/g at 0.1 C and maintained 463 mAh/g after 100 cycles with the capacity retention rate of 48.4% which is higher than that of the commercial PP separator. Thus, this work can provide a simple method for modifying separator for long-life lithium-sulfur battery. Keywords Separator . SPEEK . Lithium-sulfur battery . Shuttle effect
Introduction Due to its high specific energy and theoretical specific capacity and abundant sources of sulfur as active substances, low toxicity, clean, and pollution-free, lithium-sulfur battery has become a promising candidate for next-generation secondary batteries [1, 2]. However, there are still many problems that limit its development and application. The most serious of these is the shuttle effect of polysulfides. It not only Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03692-5) contains supplementary material, which is available to authorized users. * Jing Wang [email protected] * Zhiqiang Shi [email protected] 1
Tianjin Key Laboratory of Advanced Fibers and Energy Storage, College of Materials Science and Engineering, Tiangong University, 399 Binshui West Road, Tianjin 300387, People’s Republic of China
2
State Key Laboratory of Separation Membranes and Membrane Processes, College of Chemistry and Chemical Engineering, Tiangong University, 399 Binshui West Road, Tianjin 300387, People’s Republic of China
significantly reduces the utilization of sulfur in the active material but also leads to the passivation of the positive electrode and poor cycle stability [3]. Therefore, to solve the shuttle effect, the real practical application of the lithium-sulfur battery may be realized earlier. At present, the commonly used method for inhibiting polysulfide shuttle effect is to l
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