渐变复合结构使得高性能离子电池的稳定微型子氧化基阳极成为可能
Zhenhui Liu1, Rui Hu1, Ruohan Yu2
1Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, P. R. China.
Nano letters
|April 10, 2024
概括
使用亚氧化物 (SiO) 和碳的新型渐变复合阳极为离子电池提供了稳定,高容量的解决方案,克服了以前的限制.
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:
- 离子电池中的微型阳极遭受体积膨胀和容量退化.
- 子氧化 (SiO) 是一个有前途的阳极材料,因为它具有高的理论容量.
- 结构不稳定性限制了基于SiO的阳极的实际应用.
研究的目的:
- 开发一种稳定,高容量的微型子氧化阳极.
- 为了减轻SiO阳极的体积变化和容量色.
- 为了提高先进的离子电池阳极的电化学性能.
主要方法:
- 一个梯度复合阳极 (d-SiO@SiO/C@C) 的制造,其中有一个微小的SiO核心,SiO/C中间层和碳外层.
- 使用梯度复合材料策略来管理应力并改善结构完整性.
- 在一个带有高阴极的全电池中对复合阳极进行电化学测试.
主要成果:
- 该d-SiO@SiO/C@C阳极在1A/g的300个循环后达到1023 mAh/g的特定容量,保持率高于90%.
- 证明了出色的循环稳定性,平均库伦比克效率超过99.7%.
- 一个完整的电池表现出569Wh/kg的特定能量密度和强大的循环性能.
结论:
- 梯度复合材料策略有效地解决了微型SiO阳极的体积扩张和容量色问题.
- 制造的d-SiO@SiO/C@C阳极为高性能离子电池提供了一个有前途的解决方案.
- 这种方法为设计结构稳定和电化学稳固的微型阳极提供了可行的途径.
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