在高性能离子电池的无螺旋正电极中近表面重建
Bao Zhang1, Yongkang Liu1, Yunfeng Gu2
1National and Local Joint Engineering Research Center for Lithium-ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Battery Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Journal of colloid and interface science
|September 10, 2025
概括
用酸修改斯皮内尔酸 (LiMn2O4) 的表面,提高了它对于无电池 (LIB) 的稳定性. 这一战略提高了循环稳定性和速度能力,解决了实际应用的关键局限性.
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
- 电池技术 电池技术
背景情况:
- 酸 (LiMn2O4) 是离子电池 (LIB) 的一个有前途的无天极材料.
- 实际应用受到Jahn-Teller效应和界面不稳定性导致的容量恶化所阻碍.
- 的溶解和与有机电解质的副作用会降低性能.
研究的目的:
- 为LiMn2O4开发表面工程战略,以提高电化学稳定性和循环性能.
- 为了研究表面修饰的机制,使用酸同时进行剂和保护性涂层.
- 建立一个可扩展的方法,以实现高性能,无LIBs.
主要方法:
- 在LiMn2O4.4上使用酸进行基于聚离子的表面修饰.
- 电化学测试包括循环稳定性,速率能力和高温下的热稳定性.
- 先进的表征技术:XRD精制,XPS,HR-TEM和密度函数理论 (DFT) 的计算.
主要成果:
- 经过修改的BO3-LMO显示了显著改善的循环稳定性,在1C下经过900个循环后保持了80.6%的容量,而未经修改的LMO则保持了61.1%.
- BO3-LMO表现出极好的速度能力和热稳定性,在55°C和5°C保持高性能.
- 表面修饰稳定了MnO6八面体,抑制了溶解,并通过产生BF4−形成保护性阴极电解质介相 (CEI).
结论:
- 酸表面修饰有效地解决了LiMn2O4阴极中的界面不稳定性和结构降解.
- 修改后的阴极表现出增强的电化学性能,包括卓越的循环稳定性,速率能力和热稳定性.
- 这一综合战略提供了一种可扩展的方法,用于开发高性能,无的,基于的 spinel LIBs.
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