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对异构结构的氧化物进行界面工程,以增强离子电池中的能量存储

Tzu Ho Wu¹, Jheng An Chen¹, Jia He Su¹

¹Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan.

Journal of colloid and interface science

|October 16, 2023

概括

研究人员开发了一种用于可充电水性离子电池 (RAZIB) 的新阴极材料. 双相VO2/HVO材料提供高容量和出色的循环稳定性,对于电网规模的储能至关重要.

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:

可充电的水性离子电池 (RAZIB) 由于成本效益和安全性,对电网规模的储能充满希望.
阴极材料对于RAZIB的性能至关重要.
开发稳定和高容量的阴极对于推进RAZIB技术至关重要.

研究的目的:

为了合成和评估VO2,V10O24·12H2O (HVO) 和双相VO2/HVO作为RAZIBs的阴极材料.
研究这些材料的电化学性能和稳定性.
了解结构与财产关系,这些关系决定了它们的表现.

主要方法:

使用不同的降解剂制备VO2,HVO和VO2/HVO材料的热水合成.
电化学测试,包括充/放电循环和容量保留测量.
带结构分析以阐明提高性能背后的机制.

主要成果:

VO2的初始容量很高,但周期稳定性不佳 (在2000个周期后保持48%).
HVO表现出中等容量与卓越的稳定性 (在2000个周期后保持82%).
双相VO2/HVO材料表现出高容量 (239mAh/g在4A/g) 和良好的稳定性 (在2000个周期后80%的保留率).

结论:

这种VO2/HVO双相材料结合了VO2的高容量和HVO的稳定性.
在VO2和HVO之间形成的异质连接通过内置的电场增强了电子运输动力学.
这种异质连接导致了优越的电化学性能,使VO2/HVO成为RAZIB的有希望的阴极.

关键词:

水性离子电池是水性离子电池.二相氧化瓦纳二氧化物不同质的接口不同质的接口自动驱动的电场自动驱动的电场

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