双轴拉伸和多层复合材料在全固态聚合物电解质中的协同增强
Zhitao Yang1, Zhen Zhang1, Yong Liu1
1National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China.
ACS applied materials & interfaces
|September 12, 2024
概括
这项研究开发了用于离子电池的先进聚合物电解质. 新型多层复合聚合物电解质具有增强的离子导电性和机械强度,这对于更安全,更高效的电池性能至关重要.
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
- 聚合物科学 聚合物科学
背景情况:
- 全固态聚合物电解质 (ASSPEs) 对离子电池至关重要,需要高离子导电性,灵活性和机械强度.
- 纯ASSPEs的离子导电性较低,而填充剂降低了灵活性和机械完整性.
研究的目的:
- 开发一种新的多层复合聚合物电解质 (MCPE),用于离子电池,具有改进的性能.
- 为了解决纯ASSPEs和填充剂修改电解质的局限性.
主要方法:
- 使用无溶剂方法制备一个聚乙烯化物-co-hexafluoropropylene) / bis ((trifluoromethanesulfonyl) imide/聚乙烯氧化物) 电解质.
- 电解质经历了同步的双向拉伸,随后与基于PEO的复合聚合物电解质进行了多层覆盖.
主要成果:
- 双向拉伸诱导了分子链的方向,增强了内平面和外平面的机械性能,并抑制了树突.
- 拉伸促进了PVDF-HFP的β-晶体形式的形成,降低了离子迁移能量屏障.
- 多层复合改善了接口接触,减少了接口阻抗.
- 这些MCPE显示出高离子导电性 (1.83 × 10−4 S cm−1),低界面电阻 (547 Ω cm−2),以及优良的机械性能 (26 MPa).
结论:
- 开发的MCPE满足了全固态离子电池的性能要求.
- 双向拉伸和多层复合的组合为先进的固态电解质提供了一个有希望的战略.
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