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Electrochemical polymerization of nonflammable electrolyte enabling fast-charging lithium-sulfur battery
Energy Storage Materials ( IF 20.4 ) Pub Date : 2022-05-24 , DOI: 10.1016/j.ensm.2022.05.044
Jiahang Chen, Huichao Lu, Xuan Zhang, Yang Zhang, Jun Yang, Yanna Nuli, Yudai Huang, Jiulin Wang

Lithium-sulfur battery has received wide interest owing to its high theoretical energy density and abundant sulfur resources. Sulfurized pyrolyzed poly(acrylonitrile) (S@pPAN) cathode can eliminate the shuttle effect owing to solid-solid conversion mechanism while suffers poor electrolyte/electrodes interphase and sluggish kinetics in carbonate electrolyte. Herein, an in-situ electrochemical polymerization is firstly proposed to form a nonflammable polyether electrolyte for Li-S@pPAN battery, which enables superior lithium compatibility (over 3000 h) and modifies the cathode interphase with promoted kinetics. The polyether-rich interphase ensures high capacity (1645.3 mAh g−1 based on sulfur), fast-charging ability (10 C) and remarkable cycling stability (99.5% retention over 400 cycles) with ultrahigh average Coulombic efficiency (CE) over 99.9995%, indicating nearly no irreversible reaction on cathode. The pouch cell delivers high sulfur utilization of 91.2% and stable performance with 84.6% capacity retention over 60 cycles.



中文翻译:

不可燃电解质的电化学聚合可实现锂硫电池的快速充电

锂硫电池因其理论能量密度高、硫资源丰富而受到广泛关注。硫化热解聚(丙烯腈)(S@pPAN)正极由于固-固转换机制可以消除穿梭效应,但在碳酸盐电解质中电解质/电极界面差和动力学缓慢。在此,首先提出了一种原位电化学聚合来形成用于 Li-S@pPAN 电池的不易燃聚醚电解质,该电解质具有优异的锂相容性(超过 3000 小时),并通过促进动力学改变了正极界面。富含聚醚的界面确保了高容量(1645.3 mAh g -1基于硫)、快速充电能力(10 C)和出色的循环稳定性(400 次循环后保持 99.5%),平均库仑效率(CE)超过 99.9995%,表明在正极上几乎没有不可逆反应。该软包电池的硫利用率高达 91.2%,性能稳定,60 次循环后容量保持率为 84.6%。

更新日期:2022-05-27
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