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基乙烯纤维素间接氧化阴极与格子缺陷工程,用于高性能水性离子电池

Sheng Lu^1,2, Yu Gao¹, Wei An¹

¹School of Chemistry and Chemical Engineering, Shanghai University of Engineering Sciences, 333 Longteng Road, Shanghai, 201620, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|July 27, 2025

概括

一种新的复合阴极材料,VO-i-HEC,通过提高结构稳定性和容量来增强水性离子电池 (AZIB). 这种材料为高性能储能解决方案提供了一个有前途的途径.

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:

水性离子电池 (AZIB) 面临着阴极结构不稳定性和容量衰减的挑战.
开发稳定和高性能阴极对于推进AZIB技术至关重要.

研究的目的:

为AZIBs制造一种新的复合性阴极材料,VO-i-HEC.
为了解决结构不稳定性和氧化瓦纳 (V2O5) 阴极容量衰减的局限性.
调查乙烯纤维素 (HEC) 间隙对V2O5结构和电化学性能的协同效应.

主要方法:

通过将HEC插入V2O5.5中来制造VO-i-HEC复合材料.
结构修改的特征,包括层间间距扩大和缺陷引入.
电化学测试用于评估特定容量,速率能力和循环稳定性.
使用微分电荷密度和密度函数理论 (DFT) 进行计算分析,以了解离子扩散和反应机制.

主要成果:

HEC间隔扩大了V2O5层间距到12.74 Å,并引入了网格缺陷.
修改后的阴极 (VO-i-HEC) 的高特异容量为499.88 mAh·g−1 在0.1 A·g−1.
显著的循环稳定性得到了超过2000个周期在10A·g-1和0.004%的低容量衰变率.
DFT计算证实了减少Zn2+迁移障碍 (0.14 eV) 和抑制寄生虫反应.

结论:

使用HEC间隔的结构-接口协同调节策略对于AZIB中的基于的阴极非常有效.
VO-i-HEC表现出卓越的电化学性能,包括高容量和出色的稳定性.
这种方法为开发高性能AZIB提供了一个可行的设计范式.

关键词:

水性离子电池水性离子电池电化学运动学电化学运动学基乙纤维素 - 插曲式插曲格子缺陷格子缺陷氧化 (Pentoxide) 是一种氧化.

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