开发热稳定的以离子液体为基础的复合聚合物电解质,通过在现场聚合来实现离子可充电电池的开发
1Department of Chemical Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, Seoul 04066, Republic of Korea.
ACS omega
|September 8, 2025
概括
基于离子液体的复合聚合物电解质 (CPE) 为离子电池中的液体电解质提供了更安全的替代品. 这些新型CPE显示出优异的热稳定性和高离子导电性,提高了电池性能和循环寿命.
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
- 聚合物科学 聚合物科学
背景情况:
- 使用液体电解质 (LEs) 的商业离子电池 (LIB) 由于易燃性而带来安全风险.
- 固态电解质被探索为更安全的替代品,聚合物电解质提供加工优势,但面临导电性和稳定性挑战.
- 现有的聚合物电解质具有较低的室温离子导电性和较差的热稳定性.
研究的目的:
- 合成具有增强热稳定性和离子导电性的新型离子液体复合聚合物电解质 (CPE).
- 评估这些CPE在离子电池应用中的电化学性能和安全特性.
- 为了解决LIBs中常规聚合物电解质的局限性.
主要方法:
- 在现场聚合被用于合成离子液体基复合聚合物电解质 (CPEs).
- 对离子导电性,热稳定性,电化学窗口和接口性质进行了表征.
- 电池电池 (NCM 811/CPE/Li) 被组装并测试了放电能力,速率能力和周期寿命.
主要成果:
- 合成的CPE具有高离子导电性 (25°C时为1.38mS cm-1) 和特殊的热稳定性 (350°C时分解).
- 在长时间储存在高温 (>120°C) 后,CPE表现出宽的电化学稳定性窗口 (5V),并保持容量.
- NCM 811/CPE/Li电池显示出高放电能力 (210 mA hg-1在0.1 C) 并保持66%的容量在0.3 C的100个循环后.
结论:
- 在现场开发的聚合CPE为更安全和高性能离子电池提供了有前途的解决方案.
- 与传统的聚合物电解质相比,这些CPE具有优越的热稳定性,离子导电性和电化学性能.
- 这些发现表明,这些CPE在下一代高压和更安全的可充电电池中具有潜力.
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