用于Li-S电池的多功能水溶性粘合剂
Hongbang Zheng1,2, Longli Ma1,2, Pengshu Yi1,2
1Institute of Special Materials and Technology, Fudan University, Shanghai 200433, China. mxye@fudan.edu.cn.
Nanoscale
|October 23, 2024
概括
研究人员开发了一种用于硫 (Li-S) 电池的新型聚合物粘合剂. 这种粘合剂有效地抑制了聚硫化的穿,并提高了电池的稳定性,从而提高了循环性能和寿命.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫 (Li-S) 电池具有较高的理论容量,但受到聚硫化物 (LiPS) 穿效应和阴极结构不稳定的影响.
- 现有的结合剂往往无法充分应对这些挑战,限制了Li-S电池的性能和周期寿命.
研究的目的:
- 开发一种新型,水溶性,多功能聚合物粘合剂,用于Li-S电池中的硫阴极.
- 为了解决LiPS的穿效应,并提高硫阴极的结构完整性.
- 为了提高Li-S电池的整体电化学性能和循环稳定性.
主要方法:
- 一种新型的共聚合物粘合剂PAA-PVA-BA (PPB) 用聚烯酸 (PAA),聚乙烯醇 (PVA) 和酸 (BA) 合成.
- 研究了PPB粘合剂吸附LiPS的能力,以及其电解质兼容性和热稳定性.
- 使用PPB粘合剂制造的Li-S电池经过了电化学测试,包括循环和速率性能评估.
主要成果:
- PPB粘合剂显示出对LiPS的强烈吸附能力,有效地抑制了穿效应.
- 带有PPB粘合剂的Li-S电池表现出极好的循环稳定性,在0.5°C的200个循环后保持84.4%的容量.
- 在速率性能中观察到显著的改进,在2°C下放电容量为408.1mA hg−1.
结论:
- PAA-PVA-BA共聚合物粘合剂是一种有前途的多功能材料,可提高Li-S电池的性能.
- 本研究提出了设计先进水溶性粘合剂的新策略,以改善Li-S电池的循环寿命.
- PPB粘合剂的特性有助于Li-S电池的高效和稳定的运行,为实际应用铺平了道路.
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