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通过性溶解来提高近固态离子电池的性能

Yifan Wang¹, Weilin Yan², Xuejun Zhu²

¹Institute of Solid State Physics Chinese Academy of Sciences, Hefei Institutes of Physical Science, Hefei, CHINA.

Angewandte Chemie (International ed. in English)

|June 12, 2025

概括

这项研究引入了使用尿素的水性离子电池 (AZIB) 耐用,低成本的水凝电解质. 这种新型电解质提高了电池的性能和寿命,为灵活和环保的储能铺平了道路.

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) 为传统电池提供了有希望的替代品,但在电解质稳定性和机械耐用性方面面临着挑战.
开发具有高机械强度的灵活,环保和经济高效的水凝电解质对于推进AZIB技术至关重要.

研究的目的:

为AZIBs开发一种低成本,机械稳固的水凝电解质.
为了提高AZIB中阳极的稳定性和循环性能.
为了证明开发的水凝电解质在柔性袋式电池中的潜力.

主要方法:

加入尿素作为性溶解剂,以克服在水凝骨架中Zn(Ac) 2盐的经典度极限.
利用"脱盐"效应来增强聚合物链捆绑和机械性能.
在阳极上在现场形成一个聚氨酸固体电解质介相 (SEI) 层.

主要成果:

开发的水凝电解质具有出色的机械性能,包括557%的延伸和3.7 MPa的压力强度.
阳极表现出高可逆性,在一个Zn//Cu电池中,在150个循环中平均Coulombic效率 (CE) 为99.93%.
完全使用NH4V4O10阴极的AZIB在1000个循环中提供了253.8mAhg-1的高容量,1Ag-1的高容量,并在袋式电池中经过200个循环后保持90.13%的容量,即使在曲应力下.

结论:

尿素辅助的水凝电解质为AZIBs提供了稳定的阳极/电解质接口和卓越的机械耐用性.
这一进步使得高性能,耐用和灵活的AZIB能够适合各种应用.
该研究提出了一个可行的策略,用于开发下一代储能设备的经济高效和强大的电解质.

关键词:

水凝电解质,友溶解,机械耐用性,现场SEI,水性离子电池.

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