含有和硫的多孔碳板,含有微量铁,作为高负载硫电池的高效聚硫化物转换催化剂
Jeevanantham Sivaraj1, Bosubabu Dasari1,2, Prakash Subramani1
1CSIR-Central Electrochemical Research Institute Madras Unit, CSIR Madras Complex, Taramani, Tamil Nadu, Chennai, 600113, India.
概括
原子合碳板有效地定聚硫化物和催化反应,显著改善硫电池的周期寿命. 这种双重功能阴极材料提高了电化学性能和容量保留,用于先进的能量存储.
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) 电池在循环寿命中面临重大挑战,原因是聚硫化物 (PS) 穿和反应动力学缓慢.
- 异原子合碳材料提供了一个有希望的,具有成本效益的解决方案,通过作为双功能阴极主机.
- 这些宿主定PS并催化氧化还原反应,解决Li-S电池性能的主要局限性.
研究的目的:
- 调查原子合碳板 (CS) 在化学吸收Li2S6和催化其转化为Li2S.中的双重作用.
- 开发和评估使用这些合碳板的复合性阴极,以提高Li-S电池的性能.
- 为了证明特定的S@Fe-NS-CS-CNT阴极组合的有效性.
主要方法:
- 复合阴极的制备方法是将硫封装在异原子合的碳板 (CS) 中.
- 将CS-硫复合材料与碳纳米管 (CNT) 混合,以创建独立的阴极.
- 在Li-S电池中的S@Fe-N-CS-CNT,S@Fe-S-CS-CNT和S@Fe-NS-CS-CNT阴极的电化学性能评估.
主要成果:
- 该S@Fe-NS-CS-CNT阴极的初始放电容量高,在0.5°C时达到1017 mAh g-1的高初始放电容量.
- 它在260个循环后保持了751mAhg-1的容量,实现了73.8%的容量保留.
- 即使在高硫负载 (12毫克/厘米-2),这种阴极也最初提供了892 mAh g-1 ,在200个循环后提供了575 mAh g-1.
结论:
- 原子合碳板在提高Li-S电池性能方面具有显著的双重功能.
- 该S@Fe-NS-CS-CNT复合阴极表现出卓越的循环稳定性和高容量保留.
- 这种方法有效地减轻了聚硫化物穿,并增强了先进的储能应用的氧化还原动力学.
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