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调整Bi-Sb合金@C复合材料的组成和结构,以提供优质的离子储存

Kuo Cao¹, Yida Wang¹, Yunyong Hu¹

¹State Key Laboratory of Precision and Intelligent Chemistry, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China.

ACS applied materials & interfaces

|May 15, 2025

概括

新的Bi-Sb-碳复合材料提供稳定的离子电池阳极. 这些材料克服了体积扩张问题,为下一代储能提供了出色的循环寿命和速率能力.

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:

离子电池 (PIB) 由于的丰富性和合适的氧化还原潜力而具有前景,为离子电池提供了替代品.
合金类型的阳极如 (Sb) 和 (Bi) 对于 PIB 面临着由于运行过程中大量扩张的循环稳定性不佳的挑战.

研究的目的:

为PIBs设计和合成新的Bi-Sb-碳 (BSC) 复合阳极材料.
研究Bi/Sb比率和微结构对电化学性能和循环稳定性的影响.
了解这些复合材料中离子储存期间的相位演变机制.

主要方法:

合成Bi_xSb_1-x@C (BSC) 复合材料,使用金属有机框架 (MOF) 作为具有不同Bi/Sb比率的前体.
电化学表征包括循环性能,速率能力和现场X射线衍射 (XRD) 分析.
结构和形态分析,以将材料特性与电化学性能相关联.

主要成果:

优化的Bi_0.5Sb_0.5@C复合材料 (BS23C) 显示出卓越的循环稳定性 (94.1%的容量保留在2 A g^{-1的1500个循环后) 和速率能力 (275.2 mAh g^{-1在5.0 A g^-1).}}
复合材料的细颗粒大小,碳矩阵缓冲效果和独特的辐射组装结构有助于增强防粉和离子/电子传输.
在现场XRD揭示了两步阶段进化 (Bi_0.5Sb_0.5 K(Bi_0.5Sb_0.5) K₃(Bi_0.5Sb_0.5),其次周期中的立方阶段K₃(Bi_0.5Sb_0.5形成与稳定性改善相关.

结论:

开发的Bi-Sb-碳复合材料,特别是BS23C,显示出作为离子电池的高性能阳极材料的巨大潜力.
控制组合和微观结构对于减轻体积膨胀和提高合金类型阳极的循环稳定性至关重要.
这项研究为设计下一代离子储能系统的先进阳极材料提供了宝贵的见解.

关键词:

这是一种Bi−Sb合金.MOFs 的使用情况.构成组合的组成.高稳定性高稳定性离子电池离子电池结构的结构结构的结构.

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