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分层/道间生长氧化物阴极:形成过程,互锁化学和电化学性能

Yu Su^1,2, Ning-Ning Zhang¹, Jia-Yang Li²

¹Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China.

ACS applied materials & interfaces

|September 11, 2023

概括

发现了用于离子电池 (SIB) 的新型基层氧化物. 这项研究揭示了双相交生态结构的形成机制,提高了先进电池应用的储存性能和稳定性.

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:

基于的分层氧化物是离子电池 (SIB) 的有希望的阴极材料,因为它们的成本效益和高理论能力.
在分层阴极中,双相交互生长结构对于优越的储存性能至关重要,这是由于相之间的协同效应造成的.
这些双相交生结构的形成机制仍然不完全理解.

研究的目的:

作为一个模型系统,研究分层/道交生Na_0.6MnO₂ (LT-NaMO) 的形成机制和电化学特性.
阐明双相交生长在提高储存性能和结构稳定性方面的作用.
为SIBs提供先进的交生长阴极材料的设计提供见解.

主要方法:

层层/道间生长Na_0.6MnO₂ (LT-NaMO) 的合成.
在现场高温X射线衍射 (HT-XRD) 来研究结构演变和热稳定性.
电化学性能测试,包括循环稳定性和速率能力.
使用LT-NaMO阴极和硬碳阳极制造和测试一个全电池.

主要成果:

成功地准备了LT-NaMO模型材料,采用了分层/道间生长结构.
在现场,HT-XRD证实了生结构的形成过程和出色的热稳定性.
阶段接口的互锁效应显著减轻了结构应变和格子体积变化,增强了循环稳定性 (在5°C的300个循环中保持约70.5%的容量).
组装完整的细胞表现出高能量密度.

结论:

双相交互生长结构,特别是分层和道阶段之间的相互锁定效应,是SIB阴极中优越电化学性能的关键.
了解相互生长结构的形成机制为设计用于离子电池的高性能阴极材料提供了宝贵的指导.
作为用于实际SIB应用的阴极材料,LT-NaMO显示出有前途的潜力.

关键词:

相互封锁的化学物质.层层地/道间的生长.氧化物正极是氧化物正极.离子电池是一种离子电池.有协同效应的效应.

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