刚性-灵活的协同缓冲层设计在Mn/Co双金属MOF-derived核心-shell基阳极中,用于增强存储性能
Zhaowen Ren1, Li Li2,3, Liang Tian1
1School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China.
ChemSusChem
|August 9, 2025
概括
阳极为离子电池提供高容量,但存在扩张问题. 这项研究开发了一种复合材料缓冲层来稳定纳米粒子,显著提高了电池循环稳定性.
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
- 纳米技术纳米技术
背景情况:
- 阳极对高能离子电池具有前景,因为它们的理论容量很高.
- 循环过程中的严重体积膨胀导致阳极的容量迅速色,稳定性差.
研究的目的:
- 为阳极开发一种新的缓冲层策略,以减轻体积膨胀和提高电化学性能.
- 研究具有工程复合材料缓冲层的阳极的结构和电化学特性.
主要方法:
- 使用现场溶热方法在纳米颗粒上合成Mn/Co双金属MOF (MC-BTC) 前体.
- 控制式热解将前体转化为碳/MnO/CoO复合材料的缓冲层,在芯周围创建球形外结构.
- 使用静电循环和速率测试来评估电化学性能.
主要成果:
- 设计的Si@MC-BTC-C复合材料表现出稳定的球形外结构,有效地适应体积的扩张.
- 复合阳极在2°C下提供了1270mAhg-1的高可逆容量.
- 实现了显著的循环稳定性,在10°C下1000个循环后保持806mAhg-1的电容,每个循环的衰变率为0.06%.
结论:
- 开发的分层复合材料缓冲层有效地解决了阳极的体积扩张挑战.
- 这种接口工程方法显著提高了基于的阳极的循环稳定性和电化学性能.
- 这些发现为先进的储能系统中高容量阳极的实际应用提供了有希望的途径.
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