聚酸聚尿素基固体聚合物电解质具有高离子导电性,用于全固态离子电池
Lu Bai1,2, Peng Wang1, Chengyu Li1
1Hebei Key Laboratory of Flexible Functional Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China.
ACS omega
|June 19, 2023
概括
一种新的无溶剂方法可以制造出基于聚氨酸的先进聚酸固体聚合物电解质 (SPEs),用于更安全的高性能电池. 这些新型的SPEs在离子电池应用中显示出出色的兼容性和稳定性.
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:
- 当前现场固体聚合物电解质 (SPE) 制备通常涉及溶剂,这给工艺和安全带来了挑战.
- 在先进的电池技术中,开发无溶剂的SPE现场方法,提高处理能力和兼容性至关重要.
研究的目的:
- 开发一种新的无溶剂现场聚合方法,用于制备基于聚氨酸聚氨酸的聚酸聚合物 (PAEPU-SPEs).
- 研究聚合物骨干成分和LiTFSI度对SPE特性和性能的影响.
- 评估离子电池中开发的SPE的电化学性能和界面兼容性.
主要方法:
- 通过调节异二酸盐 (IPDI) 和异二酸盐三 (tri-IPDI) 和LiTFSI度的摩尔比率来系统合成PAEPU基的SPEs.
- 在现场聚合技术以实现交叉连接结构和良好的界面兼容性.
- 电化学表征,包括离子导电量测量和电池性能测试 (LiLiFePO4电池).
主要成果:
- 优化的PAEPU-SPE@D15 (IPDI/三-IPDI比为2:1,15重%LiTFSI) 在30°C时达到6.80×10−5 S/cm的离子导电率,在40°C以上达到10−4 S/cm.
- 基LiFePO4电池具有5.18V的广泛电化学稳定性窗口和卓越的界面兼容性.
- 该电池表现出高放电容量 (145.7 mAh g-1在第100个周期),优异的容量保留 (96.8%) 和高库伦比效率 (>98.0%).
结论:
- 开发的无溶剂现场方法成功生产了基于PAEPU的SPEs,具有出色的可加工性和界面兼容性.
- PAEPU-SPE@D15系统为离子电池提供了有前途的性能,包括稳定的循环,良好的速率能力和增强的安全性.
- 这种基于PAEPU的SPE系统对未来的电池应用具有重大潜力,比传统的PEO系统提供了优势.
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