设计CoHCF@FeHCF核心外结构,以提高离子电池的速度性能和循环稳定性
Zu-Tao Pan1, Zheng-Hua He1, Jing-Feng Hou1
1State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|July 11, 2023
概括
具有核心外结构的普鲁士蓝色类似物提高了离子电池的性能. CoHCF@FeHCF复合材料显示了用于先进的能量存储的增强速度能力和循环稳定性.
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:
- 普鲁士蓝色类似物 (PBA) 是对离子电池的有希望的阴极材料,因为它们的成本低,理论容量高.
- NaxCoFe(CN) 6 (CoHCF) 在速度性能和循环稳定性方面表现出局限性,而NaxFeFe(CN) 6 (FeHCF) 则提供更好的电化学特性.
研究的目的:
- 为了增强离子电池阴极材料的电化学特性.
- 为了研究一个CoHCF@FeHCF核心外结构的性能.
主要方法:
- 一个CoHCF@FeHCF核心外结构的合成.
- 电化学表征包括速率性能和循环稳定性测试.
- 动力分析以评估离子扩散和电容.
主要成果:
- 与未经修改的CoHCF相比,CoHCF@FeHCF核心外结构显著提高了速度性能和循环稳定性.
- 复合材料在20°C时达到54.8mAh-1g的特定容量.
- 观察到卓越的循环稳定性,在1C的100个循环后保持了84.1%的容量,在5C的200个循环后保持了82.7%.
结论:
- 核心外架构有效地提高了用于离子电池的普鲁士蓝色类似物电化学性能.
- 复合材料表现出快速的动力学,增加了表面电容,并改善了离子扩散系数.
- 这一战略为开发下一代离子电池的高性能阴极材料提供了可行的途径.
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