一个铁改性分离器用于吸附和催化转化多硫化物,用于优秀的硫电池
Zhuoying Su1, Wenjuan Qiu1, Yuming He1
1School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China. zuoxiaoxi75@163.com.
Dalton transactions (Cambridge, England : 2003)
|June 19, 2023
概括
一种用铁氧化和乙黑修改的新型分离器有效地抑制了硫电池 (LSB) 中的穿效应. 这一进步显著提高了LSB的循环稳定性和储能能力.
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:
- 硫电池 (LSB) 具有高能量密度,但由于多硫化物 (LiPS) 的穿效应,其容量降低.
- 穿效应涉及LiPS在电极之间迁移,导致效率降低和循环稳定性差.
研究的目的:
- 开发一种修改后的分离器,有效地抑制LSB中的LiPS穿效应.
- 通过分离器工程来提高LSB的循环稳定性和能量密度.
主要方法:
- 通过修改聚烯 (PP) 膜与氧化铁 (SrFe12O19,FSO) 和乙黑 (AB) 来制造一个多功能分离器.
- 研究了修改后的分离器捕获LiPS并催化其转化的能力.
- 使用修改分离器的LSB的电化学性能被评估并与控制分离器进行比较.
主要成果:
- FSO/AB@PP分离器显示与LiPS有强烈的化学相互作用,捕获它们并提供催化转化场所.
- 使用FSO/AB@PP分离器的LSB实现了高初始放电特异容量930mAhg-1在2C.
- 修改后的分离器可以稳定循环1000个周期,每周期0.036%的低色率.
结论:
- 双金属氧化物修改分离器是一种有希望的策略,可以减轻LSB中的LiPS穿效应.
- 这种方法显著提高了硫电池的循环稳定性和容量保留.
- FSO/AB@PP分离器为推进高性能LSB技术提供了一个新的解决方案.
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