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Updated: Jun 8, 2025

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从二甲基/二烯碳酸盐的石墨电极转化为螺旋双二烯离子的间歇行为

Jiaxing Qi^1,2, Hongyu Wang³, Guobao Xu^1,2

¹State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, People's Republic of China.

Langmuir : the ACS journal of surfaces and colloids

|November 5, 2024

概括

四次性酸 (QA+) 与石墨形成间化合物,影响双碳电池的性能. 电解质溶剂的组成显著影响了这种插入和电池的行为.

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:

四级氨基石墨间化合物 (QA+-GICs) 被研究为安全,经济有效和环保的负电极材料,用于双碳电池.
在混合溶剂电解质中的石墨电极中,QA+的间歇性行为在很大程度上仍未被探索.

研究的目的:

通过使用二甲基/二烯碳酸盐 (DMC/PC) 双溶剂系统,研究石墨电极中的spiro-(1,1') -bipyrrolidinium的间隙行为.
了解电解质溶剂成分对石墨/活性炭 (AC) 电容器的电化学性能的影响.

主要方法:

使用过的石墨/活性炭 (AC) 电容器,含有含有spiro-(1,1') -bipyrrolidinium tetrafluoroborate的电解质,在一个DMC/PC二元溶剂中.
在现场使用X射线衍射 (XRD) 来分析电化学循环过程中QA+-GICs的形成.
在充放电过程中监测石墨电极的可逆厚度变化.

主要成果:

螺旋 - - 1,1') - - 双铁酸转化为石墨的间歇性行为强烈依赖于电解质的溶剂组成.
在循环过程中,在石墨电极中形成了不同的QA+-GIC,直接影响了石墨/交流电容器的电化学性能.
在石墨电极中观察到可逆的厚度变化,提供了溶剂分子与QA+电离子的协同插曲的证据.

结论:

电解质溶剂的组成是控制QA+阳离子在双碳电池中转化为石墨的关键因素.
各种QA+-GIC的形成和溶剂的潜在协同插曲显著影响电容器性能.
这项研究为设计高性能石墨基储能器件的先进电解质提供了基础的见解.

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