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聚醇合NH₄ V₃ O₈与氧气空隙作为水性离子电池的高性能阴极材料

Xuanxuan Cai¹, Yu Zhang¹, Huanhuan Cheng¹

¹State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, Xinjiang, 830046, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|August 26, 2023

概括

研究人员通过结合氧缺陷工程和聚合物间隔,开发了用于水性离子电池 (AZIB) 的新阴极材料. 这种新型材料显著提高了离子传输和电池性能.

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) 面临的局限性是由于离子扩散缓慢,主要是由于缺乏先进的正极材料造成的.
开发高效的阴极材料对于提高AZIB的性能和广泛采用至关重要.

研究的目的:

为AZIBs设计一种新的阴极材料,克服缓慢离子扩散的局限性.
通过氧气缺陷工程和聚合物介质的组合,增强Zn2+离子的动力运输.

主要方法:

使用密度函数理论 (DFT) 进行理论计算,以预测聚烯 (PPy) 间隙和氧缺陷 (Od) 对NH4V3O8 (NVO) 层的影响.
通过两步的热水合成,制造嵌入OD (NVO-Od@PPy) 的PPy间接NVO.
对NVO-Od@PPy//Zn系统进行电化学测试,以评估循环稳定性和容量.

主要成果:

DFT的计算证实,PPy屏蔽和氧气缺陷优化了Zn2+运输动力学.
合成的NVO-Od@PPy电极在AZIBs中表现出极好的循环稳定性.
在0.1A g-1下实现了421 mAh g-1的最佳可逆容量,在1000个循环后175.7 mAh g-1保持在10 A g-1 (99%的保留).

结论:

氧缺陷工程和聚合物间隔的结合方法在为AZIBs开发高性能阴极材料方面是有效的.
由于其优越的容量和稳定性,NVO-Od@PPy材料显示出对推进AZIB技术的重大前景.
这项研究为下一代阴极材料的合理设计提供了有价值的见解,用于水性能量存储系统.

关键词:

氨瓦纳酸是一种氧气缺陷是因为氧气缺陷.聚乙烯 (polypyrrole) 是一种聚乙烯 (polypyrrole) 的一种.离子电池离子电池

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