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微结构调制提高了离子电池Bi极的稳定性性能

Yi-Wen Chen¹, Cheng-Lu Yang¹, Jun Guo^1,2

¹Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China. 1038gj@kust.edu.cn.

|February 26, 2025

概括

研究人员开发了一种新型的双碳涂层珠材料 (Bi/C@C_Ppy),以克服电池中的体积膨胀问题. 这种增强的阳极材料证明了高性能可充电电池的卓越稳定性和容量保留.

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:

金属 (Bi) 为电池阳极提供了高的理论容量,但在循环过程中遭受了显著的体积变化,导致性能降低.
开发策略来减轻木的体积膨胀对于改善阳极材料稳定性和循环寿命至关重要.

研究的目的:

设计和合成一种稳定的基于木的阳极材料,具有增强的电化学性能.
通过使用一种新的结构方法,在充放电周期中抑制对比斯木的体积膨胀.

主要方法:

作为前体使用了一种金金属有机框架 (Bi-MOF).
采用有机聚合涂层工艺,然后进行化,以创建双碳涂层层状板状结构 (Bi/C@C_Ppy).
进行了电化学性能测试,包括长期循环稳定性,并利用现场X射线衍射 (XRD) 来研究+储存机制.

主要成果:

该Bi/C@C_Ppy阳极材料表现出极好的容量保留,在100个循环后保持526.4 mA hg-1在0.1 A g-1和255.6 mA hg-1在900个循环后保持0.5 A g-1.
双碳涂层有效地抑制了Bi粒子聚合,并减轻了体积变化.
使用Bi/C@C_Ppy作为阳极的完整细胞在0.05 A g^{-1的100个循环后达到104.3 mA hg^-1的容量.}

结论:

开发的Bi/C@C_Ppy材料显示出作为可充电电池的高性能阳极的巨大潜力.
使用Bi-MOF前体和双碳涂层的战略为设计稳定合金阳极材料提供了可行的途径.
这项工作为先进的电池电极材料的结构工程提供了宝贵的见解.

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