固态硫电池中的固体电解质和树突动力学
Chien-Yu Pan1, Guan-Liang Kuo1, Chia-Chen Li1
1Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
ACS applied materials & interfaces
|February 15, 2025
概括
改进复合固体电解质 (CSEs) 是安全的固态电池 (SSLB) 的关键. 在CSE中分散性差导致不均的充电和树的生长,导致电池故障.
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:
- 固态电池 (SSLB) 与传统的液体电解质电池相比,提供了更高的安全性.
- 目前的SSLB通常由于固体电解质量的限制而表现较低.
- 基于陶的复合固体电解质 (CSEs) 对于SSLB的发展至关重要.
研究的目的:
- 调查基于陶的CSE中分散质量对固态硫电池 (SSLSB) 性能的影响.
- 了解Li6.4La3Zr1.4Ta0.6O12 (LLZTO) 粒子分散在PVDF-HFP矩阵中的作用.
- 确定与电解质量和树形成有关的SSLSB的故障机制.
主要方法:
- 在PVDF-HFP矩阵中制备具有不同Li6.4La3Zr1.4Ta0.6O12 (LLZTO) 分散品质的CSE.
- 使用准备好的CSE和硫阴极组装SSLSB.
- 电化学阻抗光谱 (EIS) 和放松时间分布 (DRT) 分析.
- 三电极配置,临界电流密度测试,现场光学显微镜和有限元模拟.
主要成果:
- 低质量的CSE与LLZTO差的分散导致不均的收费运输.
- 低标准的CSEs在电池循环过程中促进了显著的树形成.
- 不均的电荷传输和树突的生长被确定为容量衰减和细胞衰竭的主要原因.
- 虽然CSE可以抑制穿效应,但树的生长仍然是一个关键的挑战.
结论:
- 在CSEs中陶颗粒的分散质量极大地影响SSLSB的性能和寿命.
- 统一的电荷传输和树突的抑制对于可靠的SSLSB运行至关重要.
- 解决树的增长对于推进固态电池技术至关重要.
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