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一个创新的策略,用于构建多核黄Si/C阳极离子电池的离子电池

Yingjun Qiao¹, Yuxin Hu², Zhiqiang Qian¹

¹Key Laboratory of Green and High-end Utilization of Salt Lake Resources, Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China.

Journal of colloid and interface science

|January 15, 2025

概括

我们为离子电池的/碳黄阳极开发了一种可扩展的方法. 这种新的结构增强了稳定性和离子扩散,改善了电池性能,而不需要复杂的蚀刻过程.

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:

阳极为离子电池 (LIB) 提供高容量,但在循环过程中受到体积膨胀的影响.
现有的阳极的黄结构通常需要牺牲模板和严厉的蚀刻,限制了可扩展性.

研究的目的:

开发一种可扩展和工业应用的方法,用于制造/碳 (Si/C) 蛋黄阳极.
调查Si阳极中的黄结构的性能提升和机制.

主要方法:

可扩展的喷雾干燥技术与室温金属有机框架 (MOF) 的现场生长相结合.
可控调节喷雾干燥参数和MOF大小,以调整腔腔大小和外完整性.
电化学表征和有限元素分析 (FEA) 来评估性能和机制.

主要成果:

在没有牺牲模板的情况下,成功合成了具有可控制的多核黄结构的Si / C复合材料.
在0.5 A g-1的100个循环后达到高可逆特异容量 (1,054.5 mAh g-1),在1 A g-1的400个循环后达到优异的长期稳定性 (734.8 mAh g-1).
FEA发现,黄皮腔增强了离子扩散,有助于改善阳极性能.

结论:

通过喷雾干燥和MOF模板设计,建立了一个新的,可扩展的,用于黄皮Si-C复合材料的合成范式.
黄皮结构有效地减轻体积膨胀,并增强Si阳极中的离子扩散.
这项工作为下一代LIB提供了对黄皮结构的性能改进机制的关键见解.

关键词:

有限元素分析的研究.离子电池是一种离子电池.金属有机框架金属有机框架阳极是一种阳极.黄的结构是黄的外结构.

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