混合离子接触离子对形成,使无化物Mg离子电解质的性能提高
Stefan Ilic1,2, Sydney N Lavan1,2, Noel J Leon1,3
1Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, United States.
ACS applied materials & interfaces
|December 26, 2023
概括
三酸盐为先进的电池电解质提供无化物溶液. 这一发现提高了电池的性能和稳定性,为下一代超越离子技术的能量存储铺平了道路.
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:
- 开发超越离子储能技术的先进储能技术至关重要.
- 电池具有潜力,但在电解质稳定性方面面临挑战.
- 基于的电解质虽然对阳极有前途,但对于高压阴极缺乏氧化稳定性.
研究的目的:
- 为了确定金属阳极和高压阴极的稳定和高效的电解质.
- 为了克服含有的电解质的局限性.
- 为了实现下一代电池技术.
主要方法:
- 在没有的电解质中研究三甲硫酸盐 (triflate) 作为一个coanion.
- 利用19F核磁共振和拉曼光谱分析电解质组成.
- 运用密度函数理论来预测拟议复合物的热力学稳定性.
主要成果:
- 将三酸盐添加到 bis ((trifluoromethane sulfonyl) imide (TFSI-) 基电解质中,显著提高了性能.
- 观察到Coulombic效率的提高,并减少了金/剥离过电位 (降低了100mV).
- 与混合TFSI-Cl电解质相比,获得了对水的更好的耐受性和氧化稳定性的0.35V增加.
结论:
- 性能提升归因于与Mg2+协调的混合离子接触离子对 (triflate和TFSI-) 的形成.
- 密度函数理论证实了形成这些混合离子复合物的热力学驱动力.
- 这项研究为设计未来电池的优质电解质提供了指导原则.
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