稳定SiO阳极通过高度弹性的准固体聚乙烯基电解质通过现场制造
Mengyue Yu1, Jian Ma2, Lei Dong1
1School of Materials Science and Engineering, Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei 230009, PR China.
ACS applied materials & interfaces
|February 21, 2025
概括
一种新型的准固态聚合物电解质 (QSPE) 增强了离子电池的氧化 (SiO) 阳极. 这种弹性QSPE抑制体积膨胀并稳定固体电解质介相 (SEI),改善电池周期寿命.
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
- 聚合物化学 聚合物化学
背景情况:
- 氧化 (SiO) 是下一代离子电池的一个有前途的阳极材料,因为它具有很高的特定容量.
- 对SiO阳极的重大挑战包括循环过程中的大量体积膨胀和随后的固体电解质介相 (SEI) 破坏.
- 开发稳定的阳极材料和电解质对于推进电池技术至关重要.
研究的目的:
- 为氧化 (SiO) 阳极开发一种高度弹性的准固态聚合物电解质 (QSPE).
- 调查QSPE在缓解SiO阳极体积膨胀和SEI不稳定性的有效性.
- 为了提高使用SiO阳极的离子电池的周期稳定性和性能.
主要方法:
- 在1,3,5-三 (TXE) 的局部离子环开放聚合,以创建QSPE.
- 加入1,3,2-二氧二氧化 (DTD) 作为启动剂和薄膜形成添加剂.
- 在QSPE配方中使用乙烯碳酸作为增塑剂.
主要成果:
- 基于TXE的QSPE表现出极好的离子导电性 (25°C时为1.36mS cm−1) 和低的玻璃过渡温度 (-94.3°C).
- 该QSPE表现出高弹性模量 (42 MPa),有效抑制SiO阳极体积膨胀.
- DTD添加剂促进了与Li2SO3物种形成强大的SEI层,改善了SiO颗粒的稳定性.
结论:
- 开发的基于TXE的QSPE显著提高了离子电池中SiO阳极的周期稳定性.
- QSPE为克服SiO阳极的局限性提供了一个有希望的解决方案,提高了它们的实际应用性.
- 配备了现场QSPE的体液体电池半电池在200个循环后实现了81.9%的容量保留,性能优于液体电解质.
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