一个电解质工程同核铜复合物作为硫电池的同质催化剂
Qin Yang1, Shiying Shen2, Zhiyuan Han3
1State Key Laboratory of Environment-Friendly Energy Materials, School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, China.
Advanced materials (Deerfield Beach, Fla.)
|July 17, 2024
概括
在硫 (Li-S) 电池中使用的新型铜催化剂 (Cu-2-T) 有效地抑制了多硫化物穿和树突. 这提高了容量保留,并在实际应用中实现了稳定的循环.
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 (Li-S) 电池面临的挑战包括聚硫化物穿,缓慢的硫转化和树突,限制性能和安全性.
- 工程催化剂提供了一种有希望的方法,通过控制硫和物种的进化,同时解决这些问题.
研究的目的:
- 开发和评估一种同质的催化剂,以合理化Li-S氧化还原反应.
- 提高Li-S电池的放电能力,循环寿命和安全性.
主要方法:
- 在现场合成桥式双核铜复合物 (Cu-2-T) 作为同质电解质催化剂.
- 使用同步辐射X射线3D纳米计算机断层扫描,小角度中子散射和COMSOL模拟的表征.
- 在不同的C-率和实际条件下,对具有不同Cu-2-T度的Li-S电池进行性能测试.
主要成果:
- -2-T同质地引导Li2S核化/分解,并稳定了接口.
- 低度 (0.25 wt%) 的Cu-2-T显著提高了性能.
- 在400个循环中,容量保留从0.2°C的51.4%提高到86.3%,在1.0°C的77.0%.
- 在软包装袋细胞中实现稳定的循环,具有高硫负载 (6.5 mg cm−2).
结论:
- 开发的Cu-2-T同质催化剂有效地减轻了Li-S电池的关键限制.
- 这种催化剂可以在实际条件下提高电化学性能和稳定运行,为先进的Li-S电池技术铺平了道路.
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