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长周期金属电池的多层分离器驱动接口稳定和树突抑制

Dongxia Li¹, Lingli Liu², Xuan Song³

¹Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China; CASH GCC (Nanxiong) Research Institute of Advanced Materials Co, Ltd, Nanxiong 512000, China.

Journal of colloid and interface science

|April 17, 2025

概括

一种新型的多层分离器有效地抑制了金属电池 (LMB) 中的树的生长. 这种先进的分离器提高了电池的稳定性和循环寿命,为更安全,更有效的储能解决方案铺平了道路.

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 (LMB) 具有高能量密度,但受到树生长和副作用的影响,限制了它们的实际使用.
树岩的形成导致短路,容量衰减,以及诸如热失控等安全隐患.

研究的目的:

设计和评估用于金属电池的新型多层分离器.
抑制树的生长,提高LMB的循环稳定性和安全性.

主要方法:

使用PVDF-HFP纳米纤维膜之间嵌入的甲醇间接的Li-Al水甲酸类纳米薄膜制造三层分离器.
分离器的热稳定性,机械强度,电解质可湿性和离子导电性的表征.
使用开发的分离器,对Li对称细胞和Li的LiFePO4细胞进行电化学测试.

主要成果:

三层分离器表现出增强的热稳定性,机械强度和电解质可湿性.
分离器促进了均的Li+沉积,并抑制了树突的生长,实现了高的Li+转移数 (0.89) 和离子导电性 (1.20mS cm-1).
对称电池在2800小时以上的低电压极化过程中表现出稳定的循环运行,而在2°C的1000个循环后,体液LiFePO4电池保持了91.6%的容量.

结论:

设计的多层分离器有效地解决了金属电池技术的关键挑战.
水晶石纳米板的层次性多孔结构和易斯酸位促进离子运输和树突抑制.
这项工作为开发高性能和安全的金属电池提供了一个有前途的战略.

关键词:

没有树岩的树岩.高电流密度的高电流密度.类似于Li-Al酸的纳米板.金属电池的电池是金属的电池.多层分离器多层分离器

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