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通过电离表面活性剂实现无机丰富的接口,用于高性能金属电池

Zejun Sun¹, Jinlin Yang², Hongfei Xu¹

¹Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.

Nano-micro letters

|March 4, 2024

概括

乙烯基三甲基化 (CTAB) 通过在电解质中促进有机丰富的固体电解质介相 (SEI) 来增强金属阳极的稳定性. 这导致金属电池的循环寿命显著延长.

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:

稳定的金属阳极对于高能量密度电池至关重要.
乙电解质往往导致不稳定的固体电解质间相 (SEI) 形成.
众所周知,富含阳离子的电双层 (EDL) 区域有利于无机SEI形成.

研究的目的:

为了研究使用阴离子表面活性剂, cetyltrimethylammonium bromide (CTAB),来设计EDL并促进无机SEI的形成.
为了提高金属阳极在电解质中的稳定性和循环性能.
了解CTAB影响阳离子分布和SEI组成的机制.

主要方法:

在现场用电化学表面增强拉曼光谱 (SEIRAS) 研究EDL组成.
分子动力学 (MD) 模拟用于模拟离子相互作用.
射线光电子光谱 (XPS) 和飞行时间二次离子质谱 (ToF-SIMS) 用于SEI结构分析.
电化学循环的 Li 基底 Li 对称的细胞和 Li 基底 LiFePO4 / LiCoO2 细胞.

主要成果:

通过SEIRAS和MD模拟验证,CTAB有效地将离子 (NO3-/FSI-) 吸入EDL中.
由XPS和ToF-SIMS证实无机丰富的SEI层的形成.
改进了Li+转移动力学和同质化的Li沉积.
对称的Li干细胞显示了从500小时到1300小时的延长循环.
在高阴极负载 (>10毫克/厘米-2) 的电池中,LiFePO4和LiLiCoO2电池的稳定循环运行超过180个周期.

结论:

CTAB是一种有效的添加剂,可以在电解质中的金属阳极上产生稳定的无机SEI.
设计的SEI层显著提高了金属电池的电化学性能和循环寿命.
这一战略为开发下一代高能金属电池提供了一个有前途的途径.

关键词:

阴离子表面活性剂是什么?电气双层电气双层电气金属电池金属电池的使用方法酸的添加剂是酸的添加剂固体电解质相间阶段

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