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Sulfur-Rich Polymers Based Cathode with Epoxy/Ally Dual-Sulfur-Fixing Mechanism for High Stability Lithium–Sulfur Battery
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-01 , DOI: 10.1021/acsnano.1c05330
Tianpeng Zhang 1 , Fangyuan Hu 1 , Wenlong Shao 2 , Siyang Liu 1 , Hao Peng 1 , Zihui Song 1 , Ce Song 3 , Nan Li 2 , Xigao Jian 2
Affiliation  

Lithium–sulfur (Li–S) batteries have attracted a great deal of attention for the next-generation energy storage devices due to their inherently high theoretical energy density, high natural abundance, and low cost. However, the dissolution of polysulfides in electrolytes and their undesirable shuttle behavior lead to poor cycling performance, which obstructs practical application. Herein, we report a dual-sulfur-fixing mechanism of epoxy/allyl compound/sulfur system to prepare poly(sulfur-random-4-vinyl-1,2-epoxycyclohexane) (SVE) copolymers as powerful cathode materials. Benefiting from the stable C–S bond and a uniform distribution of ultrafine Li2S/S8 in the SVE-based polymer matrix, the SVE electrodes exerted an embedding effect to reduce polysulfides migration. The thiosulfate/polythionate protective layer derived from the terminal hydroxyl group of SVE also ensured the cycle stability of SVE electrodes during cycling. As a result, optimized SVE electrodes deliver a high reversible specific capacity of 1248 mA h g–1 at rates of 0.1 C, together with a stable cycling performance of no capacity decay per cycle over more than 400 cycles. This work provides an effective strategy for the practical application of organosulfur polymers Li–S batteries and inspires the exploration of the reaction mechanism of epoxy/allyl compound/sulfur system.

中文翻译:

用于高稳定性锂硫电池的具有环氧/合金双硫固定机制的富硫聚合物基阴极

锂硫(Li-S)电池由于其固有的高理论能量密度、高天然丰度和低成本而引起了下一代储能设备的极大关注。然而,多硫化物在电解质中的溶解及其不良的穿梭行为导致循环性能差,阻碍了实际应用。在此,我们报告了环氧/烯丙基化合物/硫系统的双硫固定机制,以制备聚(硫-无规-4-乙烯基-1,2-环氧环己烷)(SVE)共聚物作为强大的正极材料。受益于稳定的 C-S 键和超细 Li 2 S/S 8的均匀分布在基于 SVE 的聚合物基质中,SVE 电极发挥嵌入作用以减少多硫化物的迁移。SVE末端羟基衍生的硫代硫酸盐/连多硫酸盐保护层也确保了SVE电极在循环过程中的循环稳定性。因此,优化的 SVE 电极可在 0.1 C 的倍率下提供 1248 mA hg –1的高可逆比容量,以及在超过 400 次循环中每个循环没有容量衰减的稳定循环性能。该工作为有机硫聚合物锂硫电池的实际应用提供了有效的策略,并激发了对环氧/烯丙基化合物/硫体系反应机理的探索。
更新日期:2021-09-28
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