了解精益电解质和低温硫电池中硫滴形成的动态
Qi Qi1, Fangyi Shi2, Jingya Yu1,3
1Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, 999077, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 6, 2024
概括
硫电池 (LSB) 可以利用液体硫的形成,以提高性能. 这项研究揭示了液体硫的产生是独立于电解质/硫的比率,并在低温下运行,这对于高能量的LSB至关重要.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫电池 (LSB) 提供高能量密度和低成本.
- 精益电解质条件对于高能LSB至关重要,但在低温下绝缘硫颗粒方面面临挑战.
- 了解硫的行为是释放LSB潜力的关键.
研究的目的:
- 为了研究液体硫的电化学生成在LSBs.
- 在不同的电解质/硫 (E/S) 比率和低温下阐明聚硫化物氧化反应 (SOR) 动力学.
- 为改善LSB性能提供关于液体硫动态的见解.
主要方法:
- 现场光学和拉曼显微镜用于实时观察液体硫形成.
- 聚硫化反应剂和液硫产品度的量化.
- 在不同的E/S比率和温度下进行动力分析,包括极端条件 (-20°C).
主要成果:
- 在SOR过程中液体硫的形成独立于E/S比率,并且在广泛的温度范围内稳定.
- SOR动力学遵循伪零顺序行为与E/S比率依赖的反应常数.
- 液体硫即使在-20°C和低E/S比率为5μL mg-1时也能保持,具有快速的SOR动力学.
结论:
- 这项研究澄清了Li-S化学中的液体硫生成动态.
- 这些发现加深了对LSB中SOR动态的E/S比和温度影响的理解.
- 这种知识对于优化LSB设计和性能至关重要,特别是在稀缺的电解质和低温条件下.
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