在水性Mg-离子电池中的质子/Mg2+联合插入化学:从接口到内部
Meng Huang1,2,3, Xuanpeng Wang4, Junjun Wang5
1Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China.
Angewandte Chemie (International ed. in English)
|July 25, 2023
概括
在双价离子水性电池中,质子共插入对于性能至关重要. 这项研究揭示了质子在道材料中的共同插入是由接口和扩散控制的,从而提高了电池容量和稳定性.
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:
- 对高性能双价离子水性电池来说,质子联合插入至关重要.
- 对质子联合插入机制的全面理解仍然有限.
- 接口导出和离子扩散是影响质子联合插入的关键因素.
研究的目的:
- 为了研究质子在道材料中共同插入的详细机制.
- 阐明介面导出和内部扩散在质子联合插入中的作用.
- 探索质子联合插入的潜力,以提高水性电池的性能.
主要方法:
- 电化学测试单临床二氧化瓦纳 (VO2(B)) 在Mg(CH3COO) 2水溶液中的阳极.
- 界面反应的分析,包括形成富含Mg的固体电解质界面.
- 使用能量屏障计算,研究道结构内的离子扩散动力学.
主要成果:
- 确认了质子联合插入,由界面上的Mg2+水解驱动,并由道中的H2O分子促进.
- 与Mg2++H2O (2.7 eV) 相比,质子的较低的扩散能障碍表明了质子的主导地位.
- VO2 ((B) 阳极实现了高容量 (257.0 mAh g-1 在 1 A g-1 时),优异的速率保留 (59.1% 从 1 到 8 A g-1),以及稳定的循环 (81.5% 在 3000 循环后).
结论:
- 质子在道材料中的共同插入是一个复杂的过程,由接口和扩散现象控制.
- 这些发现提供了对质子联合插入的更深入的理解,这对于设计先进的水性电池至关重要.
- 这项研究为开发高性能和稳定的可充电水性电池铺平了道路.
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