瘦水凝电解质使离子电池能够在-70°C下工作
Zeping Liu1, Yu Zhang2, Meng Li1
1State Key Laboratory of Urban-rural Water Resources and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
Angewandte Chemie (International ed. in English)
|September 23, 2025
概括
研究人员开发了一种用于水性离子电池的新型水中聚合物电解质,提高了低温下的安全性和性能. 这一策略抑制了寄生反应,并改善了离子运输,使得在-40°C以下的温度下稳定运行.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 水性离子电池提供安全,负担得起的能量存储,但存在与水有关的问题,如寄生虫反应和低温性能差.
- 水的结点限制了离子运输和电池运行在-40°C以下,阻碍了实际应用.
研究的目的:
- 设计一种聚合物中的水电解质,限制水,减轻水性电解质的缺点.
- 提高离子电池的电化学稳定性和低温性能.
主要方法:
- 由质子启动的弱溶解单体定向聚合技术被用于创建聚合物中的水电解质.
- 质子启动的聚合方式将水分子限制在聚合物矩阵内.
- 电化学性能使用对称细胞和ZnRacZn0.58V2O5全细胞进行评估.
主要成果:
- 聚合物中的水电解质显著抑制了水诱导的寄生反应,并将电化学窗口扩大到2.59V.
- 由于快速的离子运输和有利的界面溶解,在-70°C达到高离子导电率 (0.36 mS cm-1).
- 对称Zn细胞在室温下超过10,000小时,在-40°C下700小时都表现出极好的循环稳定性.
结论:
- 开发的电解质策略有效地限制了水,克服了传统水性电解质的局限性.
- 这种方法使离子电池在零度以下的温度下能够稳定高效地运行,为先进的储能解决方案铺平了道路.
- 这些发现激发了对水封闭的进一步研究,以提高水性电池的性能.
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