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一个具有电子云设计的聚胺气凝分离器,以促进稳定的金属电池的离子运输

Luoyi Ding¹, Xinyang Yue¹, Xinhai Zhang¹

¹Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.

Proceedings of the National Academy of Sciences of the United States of America

|December 15, 2023

概括

本研究介绍了用于金属电池的功能性聚胺气凝 (PIA) 分离器. PIA 分离器有效地抑制了树的生长,提高了电池的性能和安全性.

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
电池技术电池技术

背景情况:

金属电池 (LMBs) 面临着树增长的挑战,影响安全性和循环寿命.
传统的具有高扬模量分离器可以减轻但不能消除树突.
控制在分离器/阳极接口上的 (Li) 行为对于树抑制至关重要.

研究的目的:

为LMBs开发一种功能分离器,促进均的Li核化并抑制树突的生长.
研究聚胺气凝 (PIA) 分离器中功能组对沉积的作用.
增强LMB的接口特性,以提高性能和安全性.

主要方法:

用精确设计的功能组制造一个聚胺气凝 (PIA).
伊胺 (N1) 和三级胺 (N2) 位点的电子特性 (电子云密度) 的表征.
在碳酸盐电解质中使用PIA功能分离器对LMB进行电化学测试.
对核化行为和树抑制的分析.

主要成果:

PIA 分离器的N1和N2位点与Li+呈现差异性静电相互作用,加速界面Li+扩散.
实现了统一的二维核和抑制的树生长.
PIA 分离器显示出高的电解质亲和度和均的Li+流量,导致稳定的Li/脱落.
带有PIA分离器的LMB显示高库伦比克效率和稳定的高速循环.

结论:

设计的PIA分离器通过控制界面Li核化,有效地抑制树突.
化学结构设计和PIA分离器中的层次孔的协同效应提高了LMB的性能.
这项工作为开发更安全,更高效的金属电池的先进分离器提供了一个有前途的战略.

关键词:

金属电池电池的使用情况离子扩散式离子扩散一个共价聚合物网的共价聚合物网.聚胺气凝是一种多胺气凝.分离器工程的分离器工程.

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