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有机染料分子间接瓦纳氧化水合物使高性能水性离子储存成为可能

Rukun Cui¹, Jianmin Gu¹, Ning Wang¹

¹State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao, 066004, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|October 8, 2023

概括

预先将甲基色和甲蓝等有机染料分子插入氧化瓦纳阴极,可显著提高水性Zn离子电池的性能. 这一策略通过减少离子网相互作用来提高容量,能量密度和寿命.

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:

分层的氧化物对水性离子电池 (AZIB) 是有前途的.
挑战包括由于强烈的离子相互作用而导致的低容量和缓慢的动力学.
探讨了客人材料的预插入,以克服这些限制.

研究的目的:

调查有机染料分子在AZIBs的氧化瓦纳阴极中作为间隔剂的使用.
通过减少Zn-离子和晶格相互作用来增强氧水合物 (VOH) 的电化学性能.

主要方法:

合成与甲基色 (MO) 和甲基蓝色 (MB) 间隔的VOH.
作为AZIB中的阴极的MO-VOH和MB-VOH的电化学表征.
计算分析 (电荷密度差异,结合能) 用于研究介质机制.

主要成果:

MO-VOH 和 MB-VOH 阴极显示了提高的特定容量 (分别为 293 和 311 mAh g-1,在 0.3 A g-1 时).
实现了增强的能量密度 (237.1Wh kg-1对于MO-VOH,232.3Wh kg-1对于MB-VOH) 和延长3A g-1的寿命.
间隙减弱了Zn-离子和V-O格子之间的静电相互作用.

结论:

有机染料间隔是提高AZIB阴极性能的一个有效策略.
减少离子晶格相互作用是改善动力学和容量的关键.
这种方法为开发高性能AZIB提供了一条途径.

关键词:

Zn2+ 的储存动力学静电相互作用静电相互作用有机染料分子有机染料分子氧化水合物氧化水合物离子电池离子电池

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