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首页> 外文期刊>Advanced Functional Materials >Sulfurized Polyacrylonitrile Cathodes with High Compatibility in Both Ether and Carbonate Electrolytes for Ultrastable Lithium-Sulfur Batteries
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Sulfurized Polyacrylonitrile Cathodes with High Compatibility in Both Ether and Carbonate Electrolytes for Ultrastable Lithium-Sulfur Batteries

机译：在超稳定锂硫电池中，在醚和碳酸盐电解质中均具有高相容性的硫化聚丙烯腈阴极

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摘要

Sulfurized polyacrylonitrile (SPAN) is a promising material capable of suppressing polysulfide dissolution in lithium-sulfur (Li-S) batteries with carbonate electrolyte. However, undesirable spontaneous formation of soluble polysulfides may arise in the ether electrolyte, and the conversion of sulfur in SPAN during the lithiation/delithiation processes is yet to be understood. Here, a highly reliable Li-S system using a freestanding fibrous SPAN cathode, as well as the sulfur conversion mechanism involved, is demonstrated. The SPAN shows high compatibility in both ether and carbonate electrolytes. The sulfur atoms existing in the form of short Symbol of the Klingon Empire S-2 Symbol of the Klingon Empire and Symbol of the Klingon Empire S-3 Symbol of the Klingon Empire chains are covalently bonded to the pyrolyzed PAN backbone. The electrochemical reduction of the SPAN by Li+ is a single-phase solid-solid reaction with Li2S as the sole discharge product. Meanwhile, the parasitic reaction between Li+ and C(sic)N bonds exists upon the first discharge, and the residual Li+ enhances the conductivity of the backbone. The recharge ability and rate capability are kinetically dominated by the activation of Li2S nanoflakes generated during discharge. At 800 mA g(-1), a specific capacity of 1180 mAh g(-1) is realized without capacity fading in the measured 1000 cycles, which makes SPAN promising for practical application.
机译：硫化聚丙烯腈（SPAN）是一种有前途的材料，能够抑制带有碳酸盐电解质的锂硫（Li-S）电池中的多硫化物溶解。然而，在醚电解质中可能会产生不希望的自发形成可溶性多硫化物，并且尚需了解在锂化/脱锂过程中硫在SPAN中的转化。在此，展示了使用独立式纤维SPAN阴极的高度可靠的Li-S系统，以及所涉及的硫转化机理。 SPAN在醚和碳酸盐电解质中均显示出高相容性。以短的克林贡帝国S-2符号，克林贡帝国符号和克林贡帝国S-3符号，克林贡帝国符号的符号形式存在的硫原子共价键合到热解PAN骨架上。 Li +对SPAN的电化学还原是单相固-固反应，其中Li2S是唯一的放电产物。同时，第一次放电时，Li +和C（sic）N键之间存在寄生反应，残留的Li +增强了骨架的导电性。充电能力和速率能力在动力学上由放电过程中产生的Li2S纳米薄片的活化所决定。在800 mA g（-1）时，实现了1180 mAh g（-1）的比容量，而在测量的1000个周期中容量没有衰减，这使得SPAN在实际应用中很有希望。

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