应用化学 ›› 2025, Vol. 42 ›› Issue (5): 668-674.DOI: 10.19894/j.issn.1000-0518.240303

• 研究论文 • 上一篇    下一篇

FeP纳米晶催化活化Li2S构建长寿命锂硫电池

陈飞(), 翟飞飞, 宋昊鑫, 吕盼   

  1. 国能信控技术股份有限公司,北京 102200
  • 收稿日期:2024-09-24 接受日期:2025-02-08 出版日期:2025-05-01 发布日期:2025-06-05
  • 通讯作者: 陈飞

FeP Nanocrystal Catalyzed Activation of Li2S for Establishment of Ultra-Stable Li-S Batteries

Fei CHEN(), Fei-Fei ZHAI, Hao-Xin SONG, Pan LYU   

  1. CHN Energy I&C Interconnection Technology Co. ,Ltd. ,Beijing 102200,China
  • Received:2024-09-24 Accepted:2025-02-08 Published:2025-05-01 Online:2025-06-05
  • Contact: Fei CHEN
  • About author:cfm6889@163.com

摘要:

通过简便且易规模化的高温原位热解聚合物制备出自支撑的核壳结构柔性多孔催化载体,用于高载量负载活性硫组分。 壳层内FeP纳米晶颗粒的引入,在加速硫电极结构内离子输运的同时,作为活性位点高效催化Li2S的活化转化,加速了Li-S电池中Li2S?S8的转化反应,保证了锂硫电池的高度可逆性和长循环稳定性。 制备的高硫负载阴极展现出较高的放电比容量(1306.2 mA·h/g)和十分优异的长循环稳定性(2 C→0.1 C,容量恢复率95.8%)。 通过循环后电池拆解分析,验证了实验条件下所组装的锂硫电池性能衰减机制。

关键词: 锂硫电池, 磷化铁纳米晶, 核壳结构, 硫化锂活化, 多孔载体

Abstract:

Through a simple and easily scalable high-temperature in-situ pyrolysis of polymers, a self-supported core-shell structured flexible porous catalytic carrier is prepared for high-loading of active sulfur components. Introducing FeP nanocrystals within the shell layer accelerates the ion transport within the sulfur electrode structure and efficiently catalyzes the activation conversion of Li2S, accelerating the conversion reaction of Li2S?S8 in Li-S batteries, ensuring high reversibility and long-term cycling stability of Li-S batteries. The prepared high-sulfur-loaded cathode exhibits high discharge specific capacity (1306.2 mA·h/g) and excellent long-term cycling stability (2 C→0.1 C, 95.8% of capacity recovery rate). Battery disassembly analysis after cycling confirms the performance degradation mechanism of the assembled lithium-sulfur batteries under the experimental conditions.

Key words: Li-S batteries, FeP nanocrystal, Core-shell structure, Li2S activation, Porous matrix

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