热压缩提高了PEO固体聚合物电解质的机械强度,用于全固态金属电池
Lanqing Zhao1, Minjie Hou1, Kun Ren1
1Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming, 650093, China.
Small methods
|March 4, 2024
概括
这项研究使用无溶剂热压方法为金属电池开发了强大的固体聚合物电解质. 增强的电解质显示出更好的导电性和稳定性,使高性能全固态金属电池成为可能.
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:
- 基于聚乙烯氧化物 (PEO) 的固体聚合物电解质 (SPEs) 为全固态金属电池 (ASSSMB) 提供了灵活性和安全性.
- 关键的局限性包括电离电导率不足和机械强度不足,阻碍了实际应用.
- 开发机械坚固和离子导电的SPEs对于推进ASSSMB技术至关重要.
研究的目的:
- 为ASSSMBs增强基于PEO的SPEs的离子导电性和机械强度.
- 为了研究将超离子导体 (Na$_{3}$Zr$_{2}$Si$_{2}$PO$_{12}$ (NZSP)) 和NaClO$_{4}$纳入基于PEO的SPEs的有效性.
- 评估ASSSMBs的电化学性能和长期稳定性,使用开发的复合电解质.
主要方法:
- 采用无溶剂热压技术制造机械坚固的基于PEO的SPE膜.
- 超离子导体Na$_{3}$Zr$_{2}$Si$_{2}$PO$_{12}$ (NZSP) 和NaClO$_{4}$被纳入以提高离子导电性.
- 全固态金属电池 (ASSSMB) 使用复合电解质组装并测试电化学性能.
主要成果:
- 准备的以PEO为基础的SPE显示出高离子导电率为4.42 × 10$^{-4}$ S cm$^{-1}$,电化学稳定窗口为4.5V与Na/Na$^{+}$.
- 该SPE促进了与电池电极的密切接触,这对于有效的离子传输至关重要.
- 这台Na $_{3}$V$_{2}${PO$_{4}$) $_{3}$@C ASSSMB显示出出色的容量保留 (97.1%在0.5°C和60°C的100个循环后) 和高库伦比效率 (接近100%).
结论:
- 无溶剂的热压方法与NZSP和NaClO$_{4}$的添加相结合,是制造稳定和高性能聚合物陶复合电解质的有希望的策略.
- 开发的SPEs显著提高了基于PEO的电解质的离子导电能力和机械强度.
- 这种方法为实现高能量密度和稳定的金属电池铺平了道路.
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