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易于涂层的Poly-N异环添加剂使离子电容器阳极在深层/脱落下能够长期稳定

Yongfeng Bu¹, Qin Kang¹, Zhaomin Zhu¹

¹Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|June 26, 2024

概括

1,4,7,10-tetraazacyclododecane (TC) 显著提高水性电解质中的阳极稳定性,在高电流密度下延长寿命至1000小时. 这一突破改善了离子电容器的性能和寿命.

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:

(Zn) 阳极树突和水性电解质中的副作用限制了高功率储能装置的性能.
具有O/N异原子的有机化合物可以抑制这些问题,但在高电流密度下稳定性仍然是一个挑战.

研究的目的:

为了研究1,4,7,10-tetraazacyclododecane (TC) 作为稳定 Zn 阳极的 ZnSO4 电解质中的添加剂的有效性.
为了评估TC修改Zn阳极在高电流密度和深层/脱落条件下的性能.

主要方法:

添加1,4,7,10-tetraazacyclododecane (TC) 加入到水性ZnSO4电解质中.
对 Zn 阳极进行电化学测试,包括在高电流密度 (10 和 20 mA cm−2) 下进行/剥离循环.
对 Zn 阳极表面形态和界面化学的分析.

主要成果:

TC将 Zn 阳极的寿命从 ~ 30 小时延长到 1000 小时 (10 mA cm−2) 和 240 小时 (20 mA cm−2).
达到5.0Ah cm-2的累积容量,99%的库伦比效率,超过现有的添加剂.
TC证明强烈结合Zn物种,促进稳定的Zn沉积,抑制树突和副作用.
经过TC修改的Zn阳极在Zn离子电容器28000个循环后表现出>94.6%的容量保留.

结论:

1,4,7,10-tetraazacyclododecane是一种非常有效的添加剂,用于稳定水性电解质中的 Zn 阳极,特别是在苛刻的条件下.
通过防止树岩的形成和副作用反应,TC使基于Zn的高功率,长寿命的储能设备成为可能.
这项工作为开发先进的基于的电容器和电池提供了一个有前途的战略.

关键词:

离子电容器离子电容器深层涂层/脱落是指深层涂层/脱落的情况.没有树的 Zn 阳极是无树的.电解质添加剂的电解质添加剂高电流密度的高电流密度.

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