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性基质诱导NaF丰富的固体电解质接口,用于无树的金属阳极

Pei Liu¹, Licheng Miao¹, Zhiqin Sun¹

¹Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China.

Advanced materials (Deerfield Beach, Fla.)

|August 4, 2024

概括

开发了一种新的3D-锡合金纳米纤维框架 (NaSn-PCNF),可以稳定金属阳极. 这一策略抑制了副作用,使高性能电池能够稳定循环运行.

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:

金属电池提供高能量密度,但面临着状岩石形成和电极不稳定的挑战.
高表面积的3D基板可以加剧副作用,限制性能,特别是在高电流密度下.

研究的目的:

通过调节固体电解质接口 (SEI) 和抑制有害的副作用反应,开发稳定的金属阳极.
为了提高电池的性能和循环稳定性,使用一种新的3D基板.

主要方法:

在一个多孔的3D纳米纤维框架 (NaSn-PCNF) 上均加载-锡 (Na-Sn) 合金.
调查Na-Sn合金和PF6阳离子之间的相互作用,以了解离子解离和电荷转移.
分析界面电解质溶解结构和SEI层组成 (高NaF含量) 的调制.

主要成果:

NaSn-PCNF在600多小时内表现出稳定的循环,在10 mA cm-2和10 mAh cm-2的低超电位 (24.5 mV) 时.
Na-Sn合金相互作用促进盐解离和自由离子的可用性.
修改后的接口和SEI层增强了电极的稳定性和可逆性.

结论:

通过控制界面反应,NaSn-PCNF策略有效地稳定了金属阳极.
这种方法加快了反应动力学,并改善了电池的容量保留.
这些发现为设计高能金属电池的先进基提供了宝贵的见解.

关键词:

三维框架 3D框架电解质溶解结构的结构金属阳极是一种金属阳极.固体电解质接口工程固体电解质接口工程

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