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高性能Mg-Li双金属离子电池基于高度伪容量的层次的TiO₂-B纳米板组装球体阴极

Mewin Vincent^1,2, Venkata Sai Avvaru^1,2, Maciej Haranczyk³

¹Electrochemistry Division, IMDEA Materials Institute, C/ Eric Kandel 2, Getafe, Madrid 28906, Spain.

|December 17, 2024

概括

一个新的层次化的TiO2-B纳米板阴极增强Mg-Li双金属离子电池. 这种高性能阴极为先进的电池技术提供了卓越的容量,循环稳定性和快速充电.

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:

Mg-Li 双金属离子电池将Mg电池的安全性与离子电池的性能相结合.
由于缺乏高性能阴极材料,实际应用受到阻碍.

研究的目的:

为Mg-Li双金属离子电池开发一种高性能阴极.
研究一种基于TiO2-B的新型阴极的电化学特性和机制.

主要方法:

制造层次的TiO2-B纳米板组装球体 (NS) 阴极.
电化学测试包括特定容量,速率性能,循环稳定性和充/放电时间.
用光谱和显微镜分析来研究电极结构变化和离子扩散机制.

主要成果:

TiO2-B NS阴极表现出高的特定容量 (303 mAh g-1 在25 mA g-1) 和优秀的速率能力 (210 mAh g-1 在1 A g-1).
卓越的循环稳定性,在3000个循环中以1 A g-1和接近100%的库伦比效率保持~100%的容量.
证明了快速充电能力,在大约12.1分钟内实现全充电.

结论:

层次化的TiO2-B NS阴极显著推进了Mg-Li双金属离子电池技术.
伪容量Mg-Li双离子扩散通过等级结构中的纳米接口是性能的关键.
这种方法为设计未来Mg-Li电池的高性能电极材料提供了一个有希望的策略.

关键词:

混合MgLi混合动力二氧化青铜 TiO2 的使用.在 insitu XRD 中.纳米薄膜的使用方法伪容量是一种伪容量.

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