Page 139 - 《精细化工》2023年第12期
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第 12 期 王天宇,等: 一种水性多功能黏结剂对锂硫电池性能的影响 ·2681·
V(DME)=1∶1〕溶剂充分洗涤至溶剂无色透明,并 (3)电化学及电池性能测试结果表明,SAPEI
在手套箱室温干燥 12 h 的 SAPEI-64 黏结剂的 XPS 黏结剂制备的硫正极表现出优异的循环性能与电化
谱图。由图 11 可知,浸泡样品 S 2p 谱中出现的硫 学稳定性,使用 SAPEI-64 黏结剂的锂硫电池首次放
酸盐信号可能是由于 Li 2 S 的湿度敏感性产生的,同 电比容量能达到 854 mA·h/g,且在 200 次循环后仍
时对比未处理的 SAPEI-64,浸泡 Li 2 S 6 的 SAPEI-64 有 620 mA·h/g 的放电比容量,容量保持率为 72.6%,
在 161 和 163 eV 处出现明显的 Li 2 S n 峰,其中,n=4 性能优于 PVDF 黏结剂。
和 6。因为样品已充分洗涤以保证完全除去物理吸 SAPEI 作为一种水性多功能黏结剂,具有优异
附的 Li 2 S 6 ,S 2p 谱中仍出现了明显的 Li 2 S 6 峰,这 的黏结性和抑制多硫化物穿梭的功能,可有效提高
说明黏结剂与放电产物之间存在很强的化学吸附作 锂硫电池性能,是一种具有潜在应用价值的锂硫电
用,SAPEI-64 黏结剂与 LiPS 之间的这种相互作用 池正极黏结剂材料。
可以有效地吸附多硫化物,并抑制多硫化物的穿梭, 参考文献:
因此提供了更优异的电池循环稳定性。
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抑制多硫化物的穿梭效应。 (下转第 2730 页)