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阻效应调节的离子溶解使高性能水性离子电池成为可能
Haozhen Dou1, Xinru Wu2, Mi Xu1
1Department of Chemical Engineering, University of Waterloo, 200 University Ave. W, Waterloo, Ontario, Canada, N2L 3G1.
Angewandte Chemie (International ed. in English)
|March 12, 2024
概括
大尺寸的糖糖生物分子产生阻电解质 (STEs),调节离子溶解结构. 这提高了阳极的可逆性和电池性能,使其能够在650个循环中稳定运行.
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:
- 水性离子电池 (AZIB) 对储能具有前景,但其性能受到阳极不稳定性的限制.
- 添加剂用于改善AZIB,但对离子溶解的固体阻碍效应及其对电池性能的影响仍未得到充分研究.
研究的目的:
- 研究大型生物分子对离子溶解结构的固体阻碍效应.
- 开发固体阻碍电解质 (STEs),以提高阳极可逆性和AZIB性能.
主要方法:
- 选择砂糖作为一个大尺寸的生物分子添加剂.
- 开发用于水性离子电池的固体阻碍电解质 (STEs).
- 使用电化学方法和材料特性分析离子溶解结构和接口演变.
主要成果:
- 通过固态阻碍,糖分子均化了溶解离子分布,并扩大了溶解,削弱了Zn2+-H2O相互作用,而无需直接参与溶解.
- STEs创建一个防水电双层,并促进在阳极上在现场形成混合固体电解质接口 (SEI).
- 带有STEs的Zn//NVO电池具有3.9 mAh·cm-2的高容量,在650个循环中以瘦电解质 (4.5 μL·mg-1) 和低N/P比率 (1.5) 的循环稳定性以及在-20°C至+40°C的稳定运行.
结论:
- 阻电解质有效调节离子溶解结构,并改善水性离子电池中的阳极可逆性.
- 开发的STEs为提高AZIB的性能和稳定性提供了一个有前途的策略,特别是在稀疏的电解质条件和广泛的温度范围内.
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