In-situ growth of ultrathin MoS_2 nanosheets on sponge-like carbon nanospheres for lithium-ion batteries

在多孔碳纳米球上原位生长超薄MoS_2纳米片构筑锂离子电池负极材料及其性能研究(英文)

Developing novel electrode materials for li-thium-ion batteries （LIBs） with rapid charge/discharge cap- ability and high cycling stability remains a big challenge to date. Herein, we demonstrate the design and synthesis of ul- trathin MoS2 nanosheets in-situ grown on sponge-like carbon nanospheres by a simple diffusion-controiled process. The unique sponge-like carbon nanosphere core can be used as ＂reservoir＂ of electrolyte by adsorbing to shorten the ion- diffusion 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 high- rate and stable LIBs.

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MoS_2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MoS_2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MoS_2/C絮状物相比,所制备的MoS_2/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.