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-合金预化亚氧化阳极构建稳定的多相酸盐层,促进离子转移动力学

Yingying Shen¹, Yun Zheng¹, Jiangmin Jiang²

¹Guangdong-Hong Kong-Macau Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Macao, SAR, 999078, China.

Journal of colloid and interface science

|October 15, 2024

概括

研究人员开发了一种带有新酸层的预化亚氧化 (SiOx) 阳极. 这提高了先进电池应用的初始库伦比克效率 (ICE) 和循环稳定性.

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:

子氧化 (SiOx) 阳极对高容量电池具有前景,但由于初始库伦比效率 (ICE) 和循环稳定性不佳而受到损害.
改善ICE和稳定性对于SiOx阳极的商业化至关重要.
现有的方法往往会损害可逆能力或增加复杂性.

研究的目的:

开发一种经济有效的方法来提高SiOx阳极的ICE和循环稳定性.
为了创建预先化核心外SiOx阳极,具有坚固的,功能性的表面层.
调查预化层在提高电化学性能方面的作用.

主要方法:

使用合金 (Li13Si4) 预化SiOx以形成核心外结构.
形成一个纳米级的多相酸 (Li2SiO3,Li4SiO4,Li2Si2O5) 表面层.
电化学表征,包括ICE和自行车稳定性测量.
使用动态电化学阻抗光谱 (dEIS) 和放松时间分布 (DRT) 的分析.

主要成果:

预化SiOx阳极实现了85.3%的高ICE和1771.5 mAhg-1.1的特定容量.
多相酸盐层提供了机械强度,作为对体积膨胀的缓冲器.
该层增强了离子扩散动力学,并促进了稳定的固体电解质介相 (SEI) 的形成.

结论:

拟议的预化策略有效地提高了SiOx阳极的ICE和循环稳定性.
纳米级的多相酸层是提高界面稳定性和电化学性能的关键.
这种方法为开发用于储能应用的高性能SiOx阳极提供了一种实用且可扩展的方法.

关键词:

放松时间的分布.最初的库伦比效率离子电池是离子电池的一种.副氧化物是的副氧化物

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