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根生长启发的自我形态 - - 微型石的进化,周围环绕微型硬碳,用于稳定离子储存

Ziyi Fang¹, Sicheng Fan¹, Zerui Yan¹

¹Department of Materials Science and Engineering, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, Xiamen Key Laboratory of High Performance Metals and Materials, College of Materials, Xiamen University, Xiamen, 361005, China.

Advanced materials (Deerfield Beach, Fla.)

|December 2, 2024

概括

微小的 (Bi) 和硬碳 (HC) 颗粒形成了离子电池的混合电极. 这种以自然为灵感的设计实现了显著的容量保留和高能储存的长期稳定性.

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
储能储能储能储能储能储能

背景情况:

合金类型的材料对于高能离子电池至关重要.
微小的粒子提供优势,如高容量和低成本,但遭受容量损失.
对电池材料的现有纳米工程方法是复杂和昂贵的.

研究的目的:

使用微小颗粒开发用于离子电池的稳定和高性能电极材料.
研究一种以自然为灵感的策略,以提高微型活性材料的电化学性能.
为了实现长期循环稳定性和厚膜电极的高容量保留.

主要方法:

一种简单的混合方法,以分散微小 bismuth (μm-Bi) 颗粒作为"种子",以微小硬碳 (μm-HC) 颗粒作为"土壤".
在循环过程中利用μm-Bi的电化学驱动的形态自我演变成为Bi-纳米网络.
混合Bi-HC厚膜电极的制造和测试以及使用Na3V2(PO4) 3阴极的全电池.

主要成果:

混合Bi-HC电极在2000个循环中显示出99.8%的稳定容量保留,显著超过裸体μm-Bi电极 (7.2%的保留).
在HC矩阵内相互连接的Bi-nanonetworks促进了电子传输和电解质透,提高了循环稳定性和速率能力.
一个Bi40HC60//Na3V2(PO4)3全细胞在没有预处理的情况下实现了4500个稳定周期,展示了卓越的综合性能.

结论:

这种以自然为灵感的"根生长"策略有效地克服了离子电池中微小Bi颗粒的容量衰减问题.
混合微型Bi-HC电极为高能,持久的离子电池提供了实用和可扩展的方法.
这种方法为在先进的储能系统中利用电化学驱动的材料进化提供了一条途径.

关键词:

合金类型的阳极毕斯穆特 (bismuth) 是一种天然气.硬碳是一种硬的碳.灵感来自于大自然,灵感来自于大自然.离子电池是一种离子电池.

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