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添加CoP与优化的d-Band中心作为双向电催化剂,用于Li-S电池的高面积容量

Haopeng Wang¹, Na Li¹, Jinfeng Sun¹

¹Hebei Key Laboratory of Flexible Functional Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China.

Journal of colloid and interface science

|March 29, 2024

概括

用添加的酸 (N-CoP@NC) 作为双向催化剂,解决聚硫化物穿和硫化物氧化问题. 这种材料表现出极好的循环稳定性,为先进的电池开发铺平了道路.

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) 电池具有较高的理论能量密度,但受到多硫化物 (LiPSs) 穿效应和较差的Li2S氧化作用的限制.
这些挑战阻碍了Li-S电池技术的商业可行性.

研究的目的:

为硫宿主开发一种新型的双向催化剂,以减轻LiPSs穿并改善Li2S氧化.
为了提高电化学性能和Li-S电池的循环稳定性.

主要方法:

合成的化化 (N-CoP@NC) 作为硫载体和电催化剂.
研究了催化剂对电子传输的影响,缺陷能量水平和Li2S和Li2S4.4内的结合.
评估了 Li-S 细胞中的聚硫化物吸附能力和电化学性能.

主要成果:

引入N-CoP@NC增强了电子传输,并改变了的电荷状态,削弱了Li-S和SS键.
催化剂在充电过程中促进Li2S氧化,并在循环过程中改善LiPSs转化.
由于晶体缺陷和Co-S键形成,观察到增强的多硫化物吸附.
带有N-CoP@NC的Li-S电池表现出极好的循环性,其低容量降解率为0.07%/周期,在0.5C的500个周期内降解.

结论:

在硫宿主中进行阳离子注是一种有前途的策略,用于开发Li-S电池的先进材料.
N-CoP@NC有效地解决了Li-S电池性能的主要局限性.
该研究强调了定制催化剂为下一代储能解决方案的潜力.

关键词:

双向电催化剂是一种双向的电催化剂.硫电池的使用方法用剂合的COP被化.硫的宿主是硫的宿主.

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