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加快由异构的Ni₃Se₄/FeSe₂协同电催化剂实现的聚硫化物连续转化,用于高性能硫电池

Junhui Si¹, Haonan Zhang¹, Yuanchang Deng¹

¹School of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350118, China.

Journal of colloid and interface science

|February 22, 2025

概括

在碳纳米纤维上的新型Ni3Se4/FeSe2合电催化剂有效捕获多硫化物并提高硫电池的性能. 这一突破解决了关键的挑战,为先进的储能系统提供了更高的容量和稳定性.

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) 电池是有希望的,但由于导电性差,动力学缓慢和聚硫化物穿效应而受到限制.
现有的解决方案难以有效地应对阻碍实用的Li-S电池应用的多方面的挑战.

研究的目的:

开发一种高效的双联电催化剂,用于捕获多硫化物 (LiPS) 并催化其转化为Li-S电池.
在碳纳米纤维上使用异构的Ni3Se4/FeSe2催化剂研究Li-S电池的性能提升.

主要方法:

在电碳纳米纤维 (CNF@Ni3Se4/FeSe2) 上直接生长的异构Ni3Se4/FeSe2合电催化剂的制造.
催化剂的特性,包括电导率,催化活性和LiPS的吸附能力.
纳入CNF@Ni3Se4/FeSe2中间层的Li-S电池的电化学测试.

主要成果:

在CNF@Ni3Se4/FeSe2中间层显示出高电导率,丰富的催化位点和强大的LiPSs化学吸收.
理论计算证实了增强的电荷转移和LiPS吸附,FeSe2和Ni3Se4催化了不同的多硫化物中间体.
-S电池实现了高可逆容量 (1412.1 mAh g-1 在0.1 C),优异的速率性能 (588.0 mAh g-1 在5 C) 和长期稳定性 (每 1000 个周期在 2 C 时每周期衰减 0.058%).

结论:

Ni3Se4/FeSe2异构结构有效地减轻了LiPS的穿效应,并增强了Li-S电池中的电化学动力学.
开发的并联电催化剂显示了实际应用的巨大潜力,即使在高硫负载下也能实现高性能.
这项研究为设计下一代Li-S电池的先进催化系统提供了宝贵的见解.

关键词:

功能介层是功能介层.异构结构就是异构结构.硫电池的使用方法协同催化剂的协同催化过渡金属的化物.

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