摘要： 【目的】锂硫（ Li-S）电池因其较高理论能量密度而受到广泛关注，但充放电过程中硫正极体积变化大，多硫化锂（LiPSs）穿梭效应严重，导致电池循环稳定性差、寿命短，传统非水系聚偏氟乙烯（ PVDF）黏结剂难以解决以上问题。【方法】利用硫辛酸（ TA）开环自聚，同时引入短链聚醚型交联剂聚乙二醇二丙烯酸酯（PEGDA）和两性离子化合物（SBMA），制备了一种硫正极用新型水性聚合物黏结剂 ——TA-PEGDA-SBMA（TPS），用以改善锂硫电池的电化学性能。【结果】采用 TPS黏结剂的硫正极在 0.25 C倍率下表现出 1 127. 6 mAh/g的初始放电比容量，经 300次稳定循环后仍保持在 835. 1 mAh/g（容量保持率为 74. 06%）。即使在 2. 0 C倍率下，其放电比容量仍高达 833. 6 mAh/g，展现出优异的倍率性能。使用该黏结剂的硫正极平均剥离强度达 1. 63 N，能够保证硫正极在充放电过程中的结构稳定性，且其丰富的极性官能团和带电基团可有效限制 LiPSs的“穿梭效应”从而综合改善锂硫电池的倍率性能及循环稳定性。【结论】 TPS黏结剂可有效抑制硫正极体积变化和 LiPSs的穿梭，效应，为实现高性能、高能量密度锂硫电池提供有效支撑。

关键词: 硫辛酸, 黏结剂, 水性聚合物, 锂硫电池, 两性离子化合物, 穿梭效应

Abstract: ［Objective］Lithium-sulfur（Li-S）batteries have garnered significant attention owing to their high theoretical energy density. However，their practical application is hindered by thesubstantial volume expansion of the sulfur cathode during charge-discharge cycling and the lithiumpolysulfide（LiPSs）shuttle effect，which collectively result in poor cycling stability and a short lifespan. Conventional non-aqueous poly（vinylidene fluoride）（ PVDF） binders are inadequate in mitigating these challenges.［Methods］A novel aqueous polymer binder for the sulfur cathode，TA-PEGDA-SBMA（TPS）， was prepared. This binder was synthesized via the ring-opening self-polymerization of hioctic acid（TA）， incorporating a short-chain polyether crosslinker（PEGDA） and a zwitterionic compound（SBMA）， with the aim of enhancing the electrochemical performance of Li-S batteries.［Results］The sulfur cathode employing the TPS binder exhibited an initial discharge specific capacityof 1 127. 6 mAh/g at 0. 25 C and maintained a capacity of 835. 1 mAh/g after 300 stable cycles， corresponding to a capacity retention of 74. 06%. Remarkably，it exhibited an outstanding rate capability，retaining a high discharge specific capacity of 833. 6 mAh/g even at a high current density of 2. 0 C. The sulfur cathode employing this binder exhibited an average peel strength of 1. 63 N，ensuring the structural stability of the sulfur cathode during charge-discharge cycling. Furthermore，its abundant polar functional groups and charged moieties effectively improved the“shuttle effect”of LiPSs.［Conclusion］ TPS binder can effectively suppress the volume variation of sulfur cathodes and theshuttle effect of lithium polysulfides（LiPSs）. Consequently，the TPS binder significantly improved boththe rate capability and cycling performance of Li-S batteries，offering a promising strategy for the development of high-performance，high-energy-density lithium-sulfur batteries. 

Key words: thioctic acid, binder, aqueous polymer, lithium-sulfur battery, zwitterionic compound, shuttle effect

中图分类号: 

• TQ630. 4