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超长周期的离子电池由谷氨酸化物添加剂启用

Qin Zhou¹, Cong Xia¹, Zhifan Kuang¹

¹College of Chemistry and Chemical Engineering, College of New Energy and Electrical Engineering, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, Hubei University Wuhan 430062 P. R. China wsqhao@hubu.edu.cn jianwen@hubu.edu.cn.

Chemical science

|November 27, 2024

概括

研究人员开发了一种新的电解质,用于离子电池,使用谷氨酸化物 (GA) 添加剂. 这通过在两个电极上形成保护层来提高电池寿命,从而显著改善工业应用的循环寿命.

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:

离子电池由于资源丰富,为离子电池提供了一个有前途的替代品.
提高离子电池的循环寿命对于其广泛的工业采用至关重要.
电解质配方是影响电池性能和寿命的关键因素.

研究的目的:

设计一个实用的离子电池电解质,具有工业应用价值.
调查无水化物化合物的使用作为新型电解质添加剂.
通过优化电解质组成,提高离子电池的循环寿命.

主要方法:

最佳电解质的配方: 1M六酸 (NaPF6) 在糖醇二甲基乙醇 (DME) /乙烯基碳酸 (VC) (1:1,v/v) 溶剂混合物中,含有2重%的谷氨酸化物 (GA).
研究电化学机制,包括在阴极上优先氧化Na+-VC和在阳极上优先减少Na+-GA.
制造和测试离子电池电池 (Na‖NVP和NVP‖HC),以评估周期寿命和容量保留.

主要成果:

设计的电解质可以同时形成阴极电解质接口 (CEI) 和表面电解质接口 (SEI) 层.
Na‖NVP电池表现出极好的稳定性,在2500个循环 (91.16 mA hg-1) 后保持了85.06%的容量.
在800个循环后,NVP‖HC全电池保持了66.50%的容量保留,展示了更好的寿命.

结论:

添加谷氨酸无水化物作为电解质添加剂显著提高了离子电池的循环寿命.
同时形成CEI和SEI对于提高电池稳定性和性能至关重要.
这种电解质设计为长寿命离子电池的工业应用提供了可行的途径.

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