异质接口设计与氧气空位丰富的辅助高容量基氧化物极材料为离子电池
Dapeng Zuo1, Weijia Meng2, Changchun Fan1
1Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China.
ACS applied materials & interfaces
|September 20, 2024
概括
研究人员开发了FeTiO3/TiO2异构的双微球 (FTO),以增强离子电池 (SIB) 阳极. FTO提高了动力学和稳定性,为高性能SIB提供了有前途的解决方案.
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:
- 离子电池 (SIB) 具有吸引力,因为它们具有丰富的资源和低成本.
- 二氧化 (TiO2) 是SIB的安全,寿命长的阳极材料,但其动力学缓慢,导电性差,和不可逆转的离子 (Na+) 捕获.
- 解决这些局限性对于推进SIB技术至关重要.
研究的目的:
- 合成新型FeTiO3/TiO2异构双微球 (FTO) 作为SIB的先进阳极材料.
- 研究FTO的结构和电化学特性,以改善Na+储存.
- 为了克服与传统TiO2阳极相关的动力限制和不可逆转的Na+捕获.
主要方法:
- 使用模板方法和双水解方法的组合用于FTO合成.
- 描述了FTO材料的结构,形态和组成.
- 评估了FTO作为SIB中的阳极的电化学性能,包括容量,速率能力和循环稳定性.
主要成果:
- 由于异构结构的内置电场效应,FTO材料表现出增强的反应动力学和电子导电性.
- 双结构促进电解质透,缩短离子/电子扩散路径,并适应体积膨胀.
- 在60个20mAg-1循环后,FTO表现出362.7mAhg-1的高容量,在1000个2Ag-1循环后,衰变率为0.0061%,在20mAg-1循环后,循环稳定性很好.
结论:
- 在基于TiO2的材料中构建异质接口是设计高性能SIB阳极的有效策略.
- FTO异构结构成功地抑制了不可逆转的Na+捕获和不利的表面相互作用.
- 开发的FTO材料显示出在先进的离子电池中实际应用的巨大潜力.
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