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微量小分子/纳米合体多尺度电解质添加剂使金属阳极的寿命超长
Xuemei Xiao1, Xiaoman Ye1, Zhijing Wu1
1School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.
Advanced materials (Deerfield Beach, Fla.)
|July 17, 2024
概括
乙酸 (ZAA) 的微量水溶性添加剂 (SWAs) 通过在阳极上形成保护层来增强水性离子电池 (AZIB). 这提高了电池的性能和寿命,为实际的AZIB应用铺平了道路.
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 (AZIB) 的性能受到电解质添加剂的限制.
- 目前的添加剂是完全水溶性 (FWA) 或水不溶性 (WIA).
- 需要采用一种新的方法,使用轻微水溶性添加剂 (SWAs).
研究的目的:
- 将微量水溶性添加剂 (SWAs) 的乙氨酸 (ZAA) 引入水性 ZnSO4 电解质中.
- 调查ZAA作为小分子调节器和纳米合体前者的双重作用.
- 评估ZAA对金属阳极 (ZMA) 稳定性和AZIB整体性能的影响.
主要方法:
- 引入乙烯基酸盐 (ZAA) 作为一种轻微水溶性添加剂 (SWA) 在水性 ZnSO4 电解质中.
- 分析ZAA在可溶性小分子和不溶性纳米聚合物中的动态溶解平衡.
- 用ZAA修饰的电解质对ZnZn半细胞和NH4V4O10Zn囊细胞进行电化学测试.
主要成果:
- 在ZMAs上,ZAA动态形成调节Zn2+溶解的可溶性分子和不溶性纳米合物,形成一个强大的固体电解质接口 (SEI) 膜.
- SWA系统显著提高了离子导电性和转移数,同时抑制了ZMA腐蚀,进化和树突成长.
- ZnZn半电池实现了15 Ah cm-2的累积板容量,而NH4V4O10Zn袋式电池在4000个循环后保持了67.8%的容量.
结论:
- 像ZAA这样的轻微水溶性添加剂 (SWAs) 为AZIBs设计先进的电解质添加剂提供了一个有希望的策略.
- 多尺度的ZAA添加剂系统有效地提高了ZMA的稳定性和自行车性能.
- 这项工作为AZIBs的实际开发和商业化提供了宝贵的见解.
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