在SiOx中酸的相位工程用于快充离子电池的阳极
Han-Xian Chen1,2, Di-Xin Xu3, Ge Li3
1CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, P. R. China.
ACS applied materials & interfaces
|December 31, 2025
概括
化工程精确控制用于快充离子电池的一氧化阳极结构. 电化学方法产生了优异的Li4SiO4相,提高了离子运输和电池性能.
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
- 电池技术 电池技术
背景情况:
- 高能量密度的阳极对于快速充电的离子电池至关重要.
- 一氧化 (SiOx) 是一个有前途的阳极材料,但它的性能取决于化结构.
研究的目的:
- 研究不同化方法 (化学与电化学) 如何影响氧化阳极的相工程.
- 为了确定酸矩阵结构和离子运输动力学之间的关系.
主要方法:
- 使用多种化技术选择性合成酸盐相 (Li2Si2O5,Li2SiO3,Li4SiO4).
- 分析[非桥梁氧]/[] ([NBO]/[Si]) 比率作为离子运输的描述符.
- 多尺度模拟以了解氧位点在离子迁移中的作用.
- 使用2Ah袋式电池进行性能验证.
主要成果:
- 化方法决定了产生的酸盐相及其[NBO]/[Si]比率.
- 非桥接氧气 (NBO) 站点促进离子运输,而桥接氧气 (BO) 站点阻碍了它.
- 电化学化产生的Li4SiO4 (最高[NBO]/[Si]) 显示出卓越的快速充电能力.
- 在4C的300个循环后,袋式电池保持了85%的容量.
结论:
- 化工程是优化SiOx阳极快速充电的关键策略.
- [NBO]/[Si]比率是设计高性能电池阳极的一个关键参数.
- 这种方法将预处理转化为先进的离子电池的基本设计原则.
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