通过像李奇一样的初级间相来形成LiF主导的SEI形成,用于快速充电的天然石墨阳极
Xiangqi Liu1, Qitao Shi2, Jiaqi Wang1
1Soochow Institute for Energy and Materials Innovation, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry, Soochow University, Suzhou, 215006, China.
Small (Weinheim an der Bergstrasse, Germany)
|July 7, 2025
概括
在天然石墨阳极上的二氧化 (TiO2-x) 涂层产生稳定的固体电解质介相 (SEI). 这种修改提高了离子电池的性能,提高了阳极的容量和循环稳定性.
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:
- 天然石墨是离子电池的关键阳极材料,由于成本和性能.
- 挑战包括电解质兼容性差,导致容量减弱和效率降低.
- 现有的TiO2-x涂层提高了稳定性,但由于脆弱的SEI,限制了快速充电.
研究的目的:
- 为了提高天然石墨阳极的快速充电能力.
- 为了提高离子电池阳极的结构完整性和循环稳定性.
- 开发一个强大的固体电解质界面 (SEI),以更好地管理界面.
主要方法:
- 将原子纳入缺乏氧气的二氧化 (TiO2-x) 表面结构.
- 形成一个类似于李奇的初级接相,以调节接口电化学.
- 使用现场X射线光电子光谱和动力评估进行分析.
主要成果:
- 在修改后的阳极上成功形成了一个强大的LiF主导的SEI.
- 由LiF主导的SEI有效地减轻了接口的副作用,并增强了电荷转移.
- 经过修改的阳极在高电流密度下显示出更好的容量,在5°C的200个循环后保持388.9mAhg-1的容量.
结论:
- 将纳入TiO2-x涂层是改善天然石墨阳极性能的一种可行的策略.
- 开发的SEI增强了离子电池的循环稳定性和快速充电能力.
- 这种方法为更持久,更高效的储能解决方案提供了途径.
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