重构水性电解质的网络以稳定铁酸对于高压pH脱细胞的稳定
Zi-Long Xie1,2, Yunhai Zhu3, Jia-Yi Du1,2
1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Angewandte Chemie (International ed. in English)
|May 20, 2024
概括
在水性电池中的普鲁士蓝类似物 (PBA) 由于质子插入的pH值变化而降解. 一个封闭水的策略稳定电解质,增强PBA的稳定性,并使高压性能.
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:
- 普鲁士蓝色类似物 (PBA) 是水性电池的有希望的阴极材料,因为它们具有离子插入能力.
- 然而,在电池运行期间PBA溶解限制了它们的实际应用和使用寿命.
研究的目的:
- 调查PBA在水性电解质中溶解的主要原因.
- 制定一种策略,以减轻PBA溶解并提高水性电池的性能.
主要方法:
- 在PBA放电期间分析电解质pH值的变化.
- 实施一个封闭水的策略来破坏质子扩散.
- 在混合电解质中铁酸盐的电化学循环.
主要成果:
- PBA溶解与由质子联合插入引起的局部升高的电解质pH有关.
- 封闭水的策略有效地中断了质子的产生和扩散.
- 铁六亚诺酸盐通过混合电解质在1C下进行了超过1000个循环的演示.
- 一个高压pH脱的电池达到1.95V的平均电压.
结论:
- 电解质pH升高是PBA溶解的关键因素.
- 封水策略显著提高了PBA的稳定性和周期寿命.
- 这种方法提高了高性能水性电池的可行性.
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