屏蔽化物离子基本性通过二urea协调,用于非水性化物航班电池
Huijian Wang1, Chengjun Lei1, Tingting Liu1
1State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Joint International Research Laboratory of Energy Electrochemistry, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
Angewandte Chemie (International ed. in English)
|November 22, 2024
概括
研究人员通过将离子与1,3-二尿素 (DPU) 与水相协调,开发出稳定的离子电解质. 这种DPU协调抑制了离子反应,使离子电池具有强大的性能.
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
- 无机化学 无机化学
背景情况:
- 化物离子 (F-) 是高度基本的,通过对有机成分的核友性攻击引起电解质不稳定.
- 这种不稳定性限制了实用的离子电池 (FIB) 的发展,原因是腐蚀性二化物 (HF2-) 的形成.
- 目前的策略通常涉及复杂的离子受体,阻碍最佳性能.
研究的目的:
- 为了提高离子电解质的化学和电化学稳定性.
- 使用有机分子开发一种新的化物离子协调策略.
- 为了提高室温离子电池的性能.
主要方法:
- 在有机化物盐中用通过键进行双 1,3-二尿素 (DPU) 协调的替代水联体.
- 研究了F-DPU系统在各种离子溶剂中的化学稳定性.
- 评估了电化学稳定性窗口和电解质的离子导电性.
- 用Pb-PbF2阳极和BiF3或Ag阴极评估 (去) 化动力学和电池性能.
主要成果:
- 在近效溶剂中达到长期化学稳定性 (>1000小时).
- 将电化学稳定性窗口扩大到-2.5-0.9 V 与 Ag+/Ag 相比.
- 在室温下获得高离子导电性 (1.7 mS cm-1).
- 与传统的离子受体策略相比,证明了更快的 (脱化) 动力学.
- 在室温FIB中持续改善电化学性能.
结论:
- 1,3-二尿素协调有效抑制化物离子的基本性,增强电解质的稳定性.
- F-DPU系统为开发高性能,稳定的离子电池提供了一个有希望的替代方案.
- 这种方法促进了更快的电极动力学,为实际的FIB应用铺平了道路.
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