在Ca (TFSI) 中金属的腐蚀2/DMAc电解质及其溶液通过合金接口和竞争性溶解
Jiang Liang1, Min Wang2, Shaohua Zhu1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P.R. China.
Angewandte Chemie (International ed. in English)
|June 18, 2025
概括
金属电池对储能充满希望,但受到电解质腐蚀的影响. 一种新的SnI2添加剂可以防止腐蚀,使电池周期稳定超过500小时.
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:
- 金属电池 (CMB) 提供高的理论容量和丰富性,但面临电解质兼容性和金属腐蚀的挑战.
- 在Ca (TFSI) 2 / DMAc电解质中发现了两个主要的腐蚀机制:来自溶剂还原的原生被动化和来自离子分解的电化学腐蚀.
- 原生被动化加剧了离子分解,导致CaF2形成和电池故障.
研究的目的:
- 为了研究Ca (TFSI) 2 / DMAc电解质中的金属的腐蚀机制.
- 开发一种电解质添加剂,可以减轻原生被动和电化学腐蚀.
- 为了提高金属电池的稳定性和性能.
主要方法:
- 在Ca (TFSI) 2 / DMAc电解质中对金属腐蚀的表征.
- 引入一种双功能SnI2电解质添加剂.
- 电化学测试,以评估循环稳定性和过电压的降低.
主要成果:
- SnI2添加剂有效地通过替代通过Ca-Sn合金的形成抑制本地被动化.
- 来自SnI2的化离子在Ca2+溶解中取代TFSI- ,防止离子分解.
- 稳定循环超过500小时,在0.1 mA cm-2和0.1 mAh cm-2的0.33 V的超电压下降时,可以实现稳定循环超过500小时.
结论:
- 建立了对电解质中金属腐蚀的基本理解.
- 双功能SnI2添加剂显著提高了金属电池的稳定性.
- 这种方法为设计金属电池的先进抗腐蚀电解质提供了途径.
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