解开阴极和阳极之间的合效应,以实现实际的硫电池
Runhua Gao1, Mengtian Zhang1, Zhiyuan Han1
1Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|July 27, 2023
概括
研究人员开发了一种新的方法,通过解决硫阴极和阳极的问题来改进硫电池. 这种设计提高了实际应用的能量密度和稳定性.
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:
- 硫阴极的局部反应异质性和阳极上的不均沉积阻碍了硫 (Li-S) 电池的实际性能.
- 现有的研究通常会独立优化硫阴极或阳极,忽视它们的合关系.
研究的目的:
- 建立对Li-S电池中硫阴极和阳极之间的合关系的全面理解.
- 开发一个描述器,用于合理的结构设计Li-S电池电极.
- 在实际条件下设计可扩展的电极结构,以提高性能.
主要方法:
- 在巴特勒-沃尔默方程的启发下,确定了一个二进制描述符 (I_BD),结合了质量运输 (I_mass) 和电荷转移 (I_charge) 指数.
- 建立了I_BD和阳极形态演变之间的关系.
- 设计和制造了一种具有相互透的流通道的可扩展电极.
主要成果:
- 开发的二进制描述器 (I_BD) 指导了硫阴极的合理结构设计.
- 工程电极展示了高效的质量/电荷转移,充分利用硫,以及机械弹性.
- 在阴极和阳极都观察到同质的局部电流密度和减少的反应异质性.
- 在Ah级袋式电池中实现了令人印象深刻的318Wh kg-1和473Wh L-1的能量密度.
结论:
- 这项研究为了解和优化Li-S电池中的阴极-阳极相互作用提供了一个有希望的范式.
- I_BD描述器通过解决合反应异质性,促进了高能,实用的Li-S电池的设计.
- 工程电极结构为改善Li-S电池的稳定性和能量密度提供了一个可扩展的解决方案.
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