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亚微米Li₆PS₅Cl调节的阴极Li动力学在硫化物基础的全固态电池中

Yuanyuan Lin¹, Hanzhou Liu¹, Yaqi Hu¹

¹School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, P. R. China. lu_yang@csu.edu.cn.

Physical chemistry chemical physics : PCCP

|January 27, 2025

概括

使用微微米级固态电解质颗粒可以增强所有固态电池中的离子动力学. 这提高了阴极性能和容量保留,这对于先进的电池设计至关重要.

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:

全固态电池 (ASSB) 在实际应用中面临挑战,原因是电极接口的离子 (Li) 动力学不佳.
阴极活性材料 (CAM) 和固态电解质 (SSE) 之间的接触不足限制了运输地点和电池的整体性能.

研究的目的:

通过增强CAM和SSE之间的接口来改善ASSB阴极中的Li动力学.
研究微微米级SSE颗粒大小对运输和电池性能的影响.

主要方法:

使用亚微米Li6PS5Cl (SU-LPSC) 颗粒制造高质量载荷的阴极.
分析电极多孔性和离子扭曲性,以量化离子通路的改进.
对基于SU-LPSC的电池进行电化学测试,以评估容量,库伦比效率和循环寿命.

主要成果:

由于SU-LPSC颗粒形成的 conformal 接触,离子扭曲度从3.91降至1.77.
显着改善了近65%的明显离子扩散系数.
SU-LPSC 阴极表现出良好的容量 (197.5 mA h g-1),高初始库伦比效率 (82.4%) 和出色的循环稳定性 (在0.5C 200 个循环后保持 93.4%).

结论:

微微米级的SSE粒子工程在增强Li动力学和提高ASSB阴极性能方面是有效的.
开发的SU-LPSC阴极为设计具有改进接口性能的高能密度ASSB提供了一个有前途的途径.
这项研究为优化复合性阴极结构和推进ASSB技术提供了宝贵的见解.

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