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在非水性K-离子电池中的阴极的MXene衍生预间接双层氧化物纳米结构

Timofey Averianov¹, Xinle Zhang¹, Ryan Andris¹

¹Materials Electrochemistry Group, Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.

ACS applied nano materials

|April 24, 2025

概括

来自MXene前体的双层氧化物 (BVO) 的形态稳定提高了离子电池的性能. 控制合成条件可以提高这些超出离子电池材料的电化学稳定性和速率能力.

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:

双层氧化物 (BVO) 是超出离子电池的有希望的阴极材料,提供可调的化学成分和高理论容量.
然而,大型超离子阻碍了BVO电极中的电化学循环和速率能力.
以前对纳米尺度花样形态的MXene衍生BVO的研究表明,离子电池的稳定性得到了改善.

研究的目的:

调查离子电池 (PIB) 中改善速度能力的形态稳定.
通过使用不同的MXene前体蚀刻协议,合成和电化学表征MXene衍生的K-预间接BVO (MD-KVO).
确定合成条件,由此产生的形态和PIBs中的电化学性能之间的关系.

主要方法:

使用不同的MXene蚀刻协议合成两种类型的V2CTx前体材料.
将MXene前体转化为具有不同的形态的K-预间接BVO (纳米花与纳米花).
在 PIB 中合成的 MD-KVO 的电化学表征,包括循环稳定性和速率能力测试.

主要成果:

MXene蚀刻条件显著影响MXene-to-oxide转化和MD-KVO的最终形态.
一种较温和的蚀刻产生了纳米花形态 (KVO-DMAE),而一种更激进的蚀刻产生了纳米花形态 (KVO-CMAE).
电化学循环证明了MD-KVO的增速能力和稳定性,特别是2D纳米花结构 (KVO-DMAE-200),归因于形态稳定和控制的离子/水含量.

结论:

纳米结构层氧化物材料的形态稳定对于提高超离子电池性能至关重要.
控制MXene前体的合成和随后的转化,可以定制材料形态和电化学特性.
这项研究强调了MXene衍生的BVO在先进的离子电池应用中的潜力.

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