Coordination effect of biocatalyst dithiothreitol and aramid fiber interlayer for lithium-sulfur batteries
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Coordination effect of biocatalyst dithiothreitol and aramid fiber interlayer for lithium‑sulfur batteries Rui Li1 · Xiaogang Sun1 · Jingyi Zou1 · Qiang He1 Received: 29 April 2020 / Accepted: 8 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Lithium-sulfur (Li–S) batteries have great development potential in the field of new energy because of their high specific capacity. However, problems such as poor conductivity of sulfur (S) and "shuttle effect" hinder the practical application of Li–S batteries. In this work, dithiothreitol (DTT) was used as a coating to form a 3D crosslinked network structure with aramid paper (AP) interlayer and inhibiting the notorious shuttle effect. DTT assisted scission of disulfide bond (-S–S- bonds) in high-order polysulfides to inhibit the diffusion of polysulfides, and the loose porous AP interlayer can significantly enhance the utilization of active substances. The successful combination of DTT and AP interlayer showed significant synergistic effect, which improved the electrochemical performance of the Li–S batteries, leading to the discharge-specific capacity of 697 mAh/g at 5C.
1 Introduction The depletion of oil resources and environmental issues are imminent, leading to an increasing demand for green energy [1]. S is a cathode material for a promising high energy density lithium ion battery; the development and application of Li–S batteries have attracted wide attention from researchers [2, 3]. Nowadays, commercial mainstream cathode materials include lithium cobaltate (LiCoO2) and lithium manganate (LiMn2O4), energy density remains insufficient to meet need [4, 5]. S is inexpensive and represents one of the most abundant elements worldwide [6], and the theoretical specific capacity of Li–S batteries is as high as 1675mAh/g [7]. Despite Li–S batteries have good development prospects, there are still some problems that need to be solved in practical applications, such as volume expansion during charging and discharging and shuttle effect [8]. Recently, numerous methods have been explored to surmount these challenges [9]. Biochar prepared from renewable biomass can increase the specific capacity and cycle performance of Li–S batteries, and the porous structure of the biochar can adsorb polysulfide [10]. Although the method of preparing biochar is inexpensive and effective, the * Xiaogang Sun [email protected] 1
School of Mechantronics Engineering, Nanchang University, Nanchang 330031, Jiangxi, China
effect of biochar to improve the performance of the carrier of the anthode is not stable. Pyrolysis of cellulose to prepare highly flexible conductive carbon fiber paper as an interlayer can steadily improve the electrochemical performance of Li–S batteries [11]. Due to the carbonized cellulose paper, polysulfides were effectively adsorbed, while significantly improves the cell discharge capacity and rate performance. Li et al. [12] used LiF to modify the separator to suppress the transfer of polysulfides from the anthode to the an
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