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洞察表面修改Ti2的Li存储属性Nb10O29高速率应用的阳极材料

Nikhitha Joseph¹, Haojie Fei¹, Constantin Bubulinca¹

¹Centre of polymer systems, Tomas Bata University in Zlín, 760 01 Zlín, Czech Republic.

ACS applied materials & interfaces

|November 16, 2023

概括

研究人员为高速电池增强了氧化 (Ti2Nb10O29或TNO15) 阳极. 碳和铜涂层显著改善了离子储存和导电性,提高了性能.

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
纳米技术纳米技术

背景情况:

基于的阳极材料为高速电池应用提供了石墨的潜在替代品.
Ti₂Nb₁₀O₂₉ (TNO15) 具有较高的储能和合适的电压窗口,但电导率差.

研究的目的:

为了增强TNO15阳极的离子 (Li+) 存储特性.
为了克服TNO15中固有的电子导电性差的局限性.

主要方法:

通过引入氧气空缺来修改TNO15.
用几层碳和铜涂层TNO15的表面涂层.
使用静电间歇定位技术 (GITT) 评估离子扩散.
制造和测试TNO15-800-C-Cu-700半电池的制造和测试.

主要成果:

碳/铜涂层TNO15显示离子扩散系数比未涂层样本高两倍.
复合材料涂层显著改善了整体电子和离子导电性.
在电流密度增加十倍后,TNO15-800-C-Cu-700半电池保持了92%的速率能力.
相互连接的TNO15纳米粒子形成了一个多孔的微球结构,促进Li+运输.

结论:

与碳和铜涂层相结合的氧气空隙有效地提高了TNO15阳极的电化学性能.
改进的导电性和多孔结构对于高速率离子电池应用至关重要.
表面修改策略对于实现像TNO15这样的先进阳极材料的全部潜力至关重要.

关键词:

间隔性阳极是介质的阳极碳铜涂层覆盖了碳铜.离子电池是一种离子电池.缺氧缺乏氧气缺乏氧气氧化和的氧化物.

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