Preparation of FeS2/CNT/S composite and application as the cathode material of lithium-sulfur batteries

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology Pub Date : 2026-03-01 Epub Date: 2026-02-17 DOI:10.1016/j.apt.2026.105210

He Linfeng, Liao Juan, Liu Xiaoqi, Liu Yuran, Wu Jun, Chen Tao, Jiang Qi

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Abstract

Metal sulfide pyrite (FeS₂) has received much attention in energy storage because of its structural diversity, abundant resources, and low cost. However, the volume expansion and poor electrical conductivity during the cycle are the main reasons for the low specific capacity. Therefore, in this study, carbon nanotubes (CNT) are introduced into FeS₂ by the organic solvothermal method to prepare FeS₂/CNT composite as the S carrier material. The FeS₂ nanoparticle ball serves as a “connecting unit” that forms a three-dimensional (3D) interconnected conductive network structure by connecting with CNT. Adding CNT can effectively change the problem of insufficient conductivity of FeS₂ to sulfur electrode, providing a large specific surface area and abundant reaction sites, which promotes the electrode reaction transformation. In addition, the porous structure of the FeS₂/CNT composite ensures the electrode’s structural integrity during the reaction process and effectively avoids volume expansion. As a result, the discharge specific capacity of FeS₂/CNT/S reaches 1352.4 mAh·g⁻¹ at 0.1C. And after 200 cycles at 0.5C, the capacity retention is 75.9%, and the capacity decay rate is only 0.12% per cycle. This work provides a new way to develop highly efficient cathode composites.

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FeS2/CNT/S复合材料的制备及其作为锂硫电池正极材料的应用

金属硫化物黄铁矿（FeS2）以其结构多样、资源丰富、成本低等特点在储能领域受到广泛关注。然而，循环过程中的体积膨胀和导电性差是导致比容量低的主要原因。因此，本研究采用有机溶剂热法将碳纳米管（CNT）引入到FeS2中，制备了FeS2/CNT复合材料作为S载体材料。FeS2纳米颗粒球作为“连接单元”，通过与碳纳米管连接，形成三维（3D）互连的导电网络结构。加入碳纳米管可以有效改变FeS2对硫电极导电性不足的问题，提供了较大的比表面积和丰富的反应位点，促进了电极的反应转化。此外，FeS2/CNT复合材料的多孔结构保证了电极在反应过程中的结构完整性，有效避免了体积膨胀。结果表明，在0.1C下，FeS2/CNT/S的放电比容量达到1352.4 mAh·g−1。在0.5℃下循环200次后，容量保持率为75.9%，每循环容量衰减率仅为0.12%。这项工作为开发高效阴极复合材料提供了一条新的途径。

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来源期刊

Advanced Powder Technology 工程技术-工程：化工

CiteScore

9.50

自引率

7.70%

发文量

424

审稿时长

55 days

期刊介绍： The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)