Abstract
Developing novel electrode materials for lithiumion batteries (LIBs) with rapid charge/discharge capability and high cycling stability remains a big challenge to date. Herein, we demonstrate the design and synthesis of ultrathin MoS2 nanosheets in-situ grown on sponge-like carbon nanospheres by a simple diffusion-controlled process. The unique sponge-like carbon nanosphere core can be used as “reservoir” of electrolyte by adsorbing to shorten the iondiffusion path, and meanwhile as “elastomer” to alleviate the structural change of the MoS2 nanosheets during the charge/discharge processes. Furthermore, the vertical ultrathin MoS2 nanosheets with broadened interlayer space greatly enrich the electrochemical active sites. Consequently, the as-obtained MoS2/C nanospheres exhibit increased specific capacities at various rates with superior cycling stability compared to the MoS2/C floccules. It is reckoned that the present concept can be extended to other electrode materials for achieving highrate and stable LIBs.
摘要
开发具有快速充放电能力和长寿命的锂离子电池用电极材料是当前面临的巨大挑战. 本文中, 我们通过一个简单的扩散过程控制设计并合成了在多孔碳球上原位生长的超薄MoS2纳米片. 这种类海绵状的多孔碳纳米球不仅可以吸附并储存大量的电解质, 有效地缩短了电化学反应过程中离子的传输路径; 而且还能用作类弹性体来缓冲表面活性电极材料在充放电过程中的结构变化. 此外, 这些超薄MoS2纳米片的层间距扩大到0.89纳米, 极大地丰富了电化学活性位点. 因此, 与相应的MoS2/C絮状物相比, 所制备的MoS2/C纳米球表现出更高的比电容量和优异的循环稳定性. 我们希望这种设计理念可以延伸到其他高倍率、 稳定电极材料的制备.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21522602, 51672082 and 91534202), the Shanghai Rising-Star Program (15QA1401200), the Innovation Program of Shanghai Municipal Education Commission, the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, and the Fundamental Research Funds for the Central Universities (222201718002).
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Ling Chen is currently a PhD candidate in Materials and Science Engineering under the supervision of Prof. Hao Jiang at East China University of Science and Technology (ECUST). Her research centers on developing transition metal oxides/dichalcogenides for energy storage and conversion.
Chunzhong Li received BSc (1989), MSc (1992) and PhD (1997) from East China University of Science and Technology (ECUST). He became a full professor of School of Materials Science and Engineering in 1998, and now he is the dean of School of Materials Science and Engineering at ECUST. His research interests include functionalization and fabrication of nanomaterials for new energy, environment and relevant applications.
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Chen, L., Jiang, H., Hu, Y. et al. In-situ growth of ultrathin MoS2 nanosheets on sponge-like carbon nanospheres for lithium-ion batteries. Sci. China Mater. 61, 1049–1056 (2018). https://doi.org/10.1007/s40843-017-9215-3
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DOI: https://doi.org/10.1007/s40843-017-9215-3