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用于金属电池的聚多巴胺基酸改性分离器具有高速率能力和超长循环寿命

Shixiang Liu^1,2, Qiang Liu³, Pu Cheng^1,2

¹ZJU‑Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, 311215, P. R. China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|April 1, 2025

概括

研究人员开发了一种用于金属电池 (LMB) 的新功能分离器,通过涂层聚烯/聚乙烯/聚烯分离器用聚多巴胺铜酸盐. 这通过抑制树突来提高安全性和快速充电性能,并改善循环稳定性.

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:

金属电池 (LMB) 提供高能量密度,但由于高速循环时的树形成,面临安全问题.
开发先进的分离器对于克服这些挑战和实现实际的LMB应用至关重要.

研究的目的:

创建一个多功能分离器,提高LMB的安全性和快速充电能力.
为了解决树状石的形成,并改善LMBs的长期循环稳定性.

主要方法:

在标准的聚烯 (PP) /聚乙烯 (PE) /PP分离器上,聚多巴胺铜酸盐 (PDA(Cu)) 涂层的现场生长.
分离器的电化学特性,包括离子导电性和离子转移.
评价板-剥离行为在Li干Li对称细胞和循环性能在LiFePO4干Li细胞.

主要成果:

经过修改的PP/PE/PP@PDA(Cu) 分离器表现出优异的电解质浸湿性和离子选择性,达到高离子导电率 (5.02 × 10−4 S cm−1) 和高Li+转移数 (0.776).
这种PDA(Cu) 涂层有效地抑制了树的生长,使树对称细胞能够稳定循环900多个小时.
使用修改后的分离器的电池表现出增强的循环稳定性,在10°C的6000个循环后保持85.1%的容量.

结论:

PDA ((Cu) 涂层分离器通过减轻树突形成和促进稳定的接口,显著提高了LMB的安全性和性能.
这种新的分离器设计为推进下一代金属电池快充和长周期寿命提供了一个有希望的策略.

关键词:

高速的能力能力能力.金属电池的金属电池是什么聚多巴胺合物合物分离器分离器分离器分离器分离器

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