NiCo2S4@graphene nanocomposites as high-performance cathode materials with enhanced rate capability for Lithium-ion batteries

IF 4.2 Q2 CHEMISTRY, MULTIDISCIPLINARY

Results in Chemistry Pub Date : 2025-09-10 DOI:10.1016/j.rechem.2025.102700

Mursaleen Shahid , Amtul Basit , Nayan Banik , Taimoor Abbas , Renu Sharma , Subbulakshmi Ganesan , C.P. Surya , Subhashree Ray , Bekzod Madaminov , Mirjalol Ismoilov Ruziboy Ugli

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Abstract

In this study, we present the preparation and electrochemical performance (ECP) of NiCo₂S₄@graphene nanocomposites as high-performance cathode materials for lithium-ion batteries (LIBs). Hydrothermal synthesis in a single step was employed to fabricate the composite, enabling uniform anchoring of NiCo₂S₄ nanoparticles on the graphene matrix. Structural characterization using XRD, Raman spectroscopy, SEM, and BET investigation revealed the successful formation of the composite with a mesoporous architecture and improved surface area. Electrochemical testing revealed that the NiCo₂S₄@graphene electrode delivered a high initial discharge capacity (DC) of 113.4 mAh g⁻¹ at 0.1C, significantly surpassing 97.5 mAh g⁻¹ observed for pristine NiCo₂S₄. Under a high current rate (CR) of 5C the composite achieved 58.02 mAh g⁻¹, whereas the unmodified sample reached only 27.78 mAh g⁻¹, confirming its improved capability for fast charge and discharge. EIS showed a marked reduction in charge transfer resistance (R_CT) from 138 Ω (NiCo₂S₄) to 64 Ω (NiCo₂S₄@graphene), highlighting improved interfacial charge transport. Additionally, capacity retention after 30 cycles at various current rates was 95% for the composite, compared to 91% for pristine NiCo₂S₄. The enhanced electrochemical behavior stems from the integrated contribution of the interaction between the conductive graphene matrix and the redox-active NiCo₂S₄ nanoparticles, which together improve electron mobility, structural stability, and ion diffusion. This outcome underscores the suitability of NiCo₂S₄@graphene composites for high-performance LIB applications.

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NiCo2S4@graphene纳米复合材料是锂离子电池的高性能正极材料，具有增强的倍率能力

在这项研究中，我们介绍了NiCo2S4@graphene纳米复合材料作为锂离子电池（LIBs）高性能正极材料的制备及其电化学性能。该复合材料采用单步水热合成，使NiCo2S4纳米颗粒能够均匀锚定在石墨烯基体上。利用XRD、拉曼光谱、SEM和BET等手段对该复合材料进行了结构表征，结果表明该复合材料具有介孔结构和提高的比表面积。电化学测试表明，NiCo2S4@graphene电极在0.1C条件下具有113.4 mAh g−1的高初始放电容量（DC），显著超过原始NiCo2S4的97.5 mAh g−1。在高电流倍率（CR） 5C下，复合材料达到58.02 mAh g−1，而未改性的样品仅达到27.78 mAh g−1，证实了其提高的快速充放电能力。EIS显示电荷转移电阻（RCT）从138 Ω （NiCo2S4）显著降低到64 Ω （NiCo2S4@graphene），表明界面电荷传输得到了改善。此外，在不同电流速率下，30次循环后，复合材料的容量保留率为95%，而原始NiCo2S4的容量保留率为91%。增强的电化学行为源于导电石墨烯基体和氧化还原活性NiCo2S4纳米颗粒之间相互作用的综合贡献，它们共同提高了电子迁移率、结构稳定性和离子扩散。这个结果强调了NiCo2S4@graphene复合材料对于高性能LIB应用程序的适用性。

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