纳米粒子诱导的SiO2抗水凝电解质使Zn-I2电池能够在低温下具有完整和可逆的四电子转移机制
Minghui Chen1, Guanhong Chen1, Chenxi Sun1
1State Key Lab of Physical Chemistry of Solid Surfaces, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P.R. China.
一种新的防水凝电解质 (HC-SiO2) 能够使低温水性-电池实现高效的四电子转移. 这一突破克服了结的局限性和缓慢的动力学,用于实际的大规模储能.
科学领域:
- 储能 储能 储能 储能 储能 储能
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 水性-电池提供高容量的储能.
- 低温操作受到电解质结和反应动力学缓慢的阻碍.
研究的目的:
- 为低温准固态-电池开发一种防水凝电解质.
- 为了在零度以下的温度下实现完全和可逆的四电子转移.
主要方法:
- 一种高度的电解质 (1m Zn(OAc) 2 + 21m LiCl) 与SiO2纳米粒子结合,形成一种防水凝 (HC-SiO2).
- 分析了水凝的特性,以检测离子相互作用,水活性和键网络.
- 使用HC-SiO2电解质的准固态Zn-I2电池的电化学性能在低温下进行了评估.
主要成果:
- 由于增强的离子分散,HC-SiO2水凝的结点为-60.7°C.
- 电解质抑制了I+水解和冰核形成,同时改善了I2/I+反应动力学.
- 电池表现出高容量490.9 mAh g-1和在-20°C下超过11000个循环.
结论:
- 开发的HC-SiO2水凝电解质有效地促进Zn-I2电池中低温四电子转移.
- 对离子相互作用,水活性和离子活性的协同效应是性能的关键.
- 这项研究为实际的低温水性储能解决方案提供了途径.
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