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在鲁VO₂中秩序-混乱过渡 (M) 电极在Li间隙和提取过程中

Morten Johansen¹, Dorthe B Ravnsbæk¹

¹Center for Integrated Materials Research, Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark.

|September 2, 2024

概括

离子电池电极在离子循环过程中经历结构变化. 这项研究揭示了鲁VO2 (M) 无可逆转地转化为无序的LiVO2结构,使可逆间隔成为可能.

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
固态化学固态化学

背景情况:

过渡金属氧化物是离子电池的关键电极材料.
离子间隙/提取会诱导结构转变,影响电池性能和寿命.
了解秩序-混乱过渡对于设计先进的电池化学是非常重要的.

研究的目的:

为了研究rutile VO2 (M) 电极中间隔诱导的顺序-混乱过渡.
为了阐明离子电池运行期间的结构演变.
为了识别rutile氧化物内部的干驱动过渡的一般趋势.

主要方法:

电静电充放电循环. 电静电充放电循环.
操作粉末的X射线衍射 (XRD).
总的X射线散射与对分布函数 (PDF) 分析.

主要成果:

鲁VO2 (M) 经历了一个不可逆转的结构转变.
这种转化导致了一个高度混乱的分层LiVO2结构.
这种无序的结构促进了可逆的离子间隔.

结论:

这项研究提供了对电池材料中合诱导的秩序障碍现象的关键见解.
这些发现突显了鲁VO2 (M) 转化为功能失调的LiVO2阶段.
建议在鲁氧化物中进行干驱动的转换的一般趋势.

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