在无碳铁化物阴极中解码多电子氧化路径:在极端温度下实现能量密度高的全固态电池
Qingyu Li1, Shuxian Zhang1, Renbo Liu1
1Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan, 250061, China.
铁化物阴极为完全固态电池提供无碳的解决方案. 这项研究强调了α-FeSe
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 转换型阴极为下一代全固态电池 (ASSLB) 提供多电子氧化还原和成本效益.
- 现有的ASSLB阴极材料通常需要碳添加剂,影响性能和安全性.
- 由于其固有的氧化还原特性,铁化物是一个有前途的替代品.
研究的目的:
- 研究α-FeSe作为ASSLB无碳阴极材料的潜力.
- 评估α-FeSe阴极的电化学性能,循环稳定性和温度范围.
- 了解底层的氧化还原机制,包括双 Fe/S 氧化还原过程.
主要方法:
- 在硫化物固态电解质系统中对α-FeSe的电化学表征.
- 在不同温度和高面积负载下对循环性能进行评估.
- 通过延长循环和高温测试对氧化还原反应的分析.
主要成果:
- 无碳α-FeSe阴极在30°C时表现出稳定的Fe2+/Fe0氧化还原,具有很高的可逆容量 (564.6 mAh-1 g) 和良好的循环稳定性 (80.3%在800个循环后保持).
- 该材料表现出优异的Li+/e转移,有限的体积变化,高面积负载 (≈26 mg cm-2),以及广泛的温度可操作性 (-20-150 °C).
- 采用Fe2+/Fe0和S/S2-的双氧还原机制使其具有特殊的循环性 (>60°C的6000个循环) 和增强的容量 (120°C的956mAhg-1).
- 在ASSLB中达到超高的能量密度 (120°C时1568 Wh kg-1/8310 Wh L-1).
结论:
- α-FeSe 是一个非常有前途的无碳阴极材料,用于实际的ASSLB.
- 双氧还原机制显著提高了循环利用性和特异性.
- 铁化物为高能量密度固态电池提供了可行的途径.
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