无形铁酸盐使高负载硫电池的多硫化物快速回氧成为可能
Guangfeng Zeng1, Dongjiang Chen2, Cheng Zhen3
1Collage of Chemistry and Food Science, Yulin Normal University, Yulin, 537000, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|June 28, 2023
概括
这项研究引入了用于硫 (Li-S) 电池的无形铁酸盐修饰分离器. 它有效地抑制了聚硫化物穿,提高了电池的性能,并使实际应用成为可能.
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:
- 聚硫化物穿是硫 (Li-S) 电池的一个主要限制.
- 无形催化剂由于丰富的活性位点,有望增强催化活性.
- 了解无形催化剂的结构-活性关系对于Li-S电池的开发至关重要.
研究的目的:
- 为修改聚烯分离器 (C-Fe-Phytate@PP) 提出一种无形的酸盐结构.
- 为了增强聚硫化物转化,并抑制聚硫化物在Li-S电池中的穿.
- 为了研究无形Fe-Phytate结构的催化活性和吸附特性.
主要方法:
- 无形Fe-Phytate的合成和表征.
- 用C-Fe-Phytate@PP.修改聚烯分离器的方法.
- 使用修改后的分离器对Li-S电池进行电化学测试.
主要成果:
- 在C-Fe-Phytate@PP分离器中,通过Fe-S结合证明了通过Fe-S结合加速的聚硫化物转化.
- 与裸碳相比,观察到增强的氧化还原动力学和强大的聚硫化物吸附.
- 带有C-Fe-Phytate@PP的Li-S电池实现了高速率 (690 mAh g−1在5 C) 和面积容量 (7.8 mAh cm−2在7.3 mg cm−2硫负载下).
结论:
- 无形Fe-酸盐是Li-S电池中聚硫化物转换的有效催化剂.
- 修改后的分离器显著抑制了穿效应,改善了电池的性能.
- 这项工作为推进Li-S电池的实际应用提供了一个新的分离器战略.
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