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Updated: May 14, 2025

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在离子电池中,以LiPF₆ + LATP复合电解质为基极电解质间相/固体电解质间相的形成机制和新功能₆ + LATP复合电解质

Mengxia Wang¹, Yanlin Zhou¹, Kun Zou¹

¹School of chemistry and chemical engineering, Guizhou University, Guiyang550025, China.

Langmuir : the ACS journal of surfaces and colloids

|May 13, 2025

概括

酸 (LATP) 添加剂通过形成保护性阴极和固体电解质相间层来增强电池的稳定性. 这提高了循环寿命,热稳定性,减少了自放电,提高了性能.

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:

电池的循环稳定性至关重要,受阴极电解质介面 (CEI) 和固体电解质介面 (SEI) 的无机成分的影响.
电解质添加剂可以同时修改CEI和SEI层,影响电池性能.
了解相间形成是开发先进离子电池的关键.

研究的目的:

调查Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) 作为电池中的电解质添加剂的作用.
分析LATP如何修改CEI和SEI层,并影响电池性能,包括循环稳定性,热稳定性和自放电.
探索CEI/SEI与LATP形成的机制及其对离子迁移的影响.

主要方法:

用LATP作为电解质添加剂在基于LiPF6的电解质中用于离子电池测试.
组装LiFePO₄/Li硬币电池,以评估复合电解质的性能.
分析了形成的CEI和SEI层的组成和特性.

主要成果:

LATP添加剂形成了富含LiF和Li₃PO_{4}的CEI和SEI层,增强了循环稳定性.}
带有LATP的细胞表现出更好的放电能力 (119.12 mA hg-1在2°C下500个周期) 和显著减少的自我放电 (128.9 mA hg-1在400小时储存后0.1°C).
LATP调节了Li+嵌入/脱嵌入,降低了氧化潜力,并增加了Li+迁移速度.

结论:

LATP有效地提高了离子电池的电化学性能,循环稳定性和自放电特性.
通过LATP形成LiF和Li₃PO₄丰富的界面对于增强电池功能至关重要.
这项研究为设计用于高能量密度,快充离子电池的复合电解质提供了一种新方法.

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