Shimoi Norihiro, Aonuma Hirotaka, Komatsu Masae
Department of Electrical and Electronic Engineering, Tohoku Institute of Technology, 35-1 Yagiyama Kasumi-cho, Taihaku-ku, Sendai, 982-8577, Japan.
Sci Rep. 2025 May 26;15(1):18354. doi: 10.1038/s41598-025-03505-7.
To achieve high-performance electrochemical anodes properties, active materials of anodes with improved cycle performance were composited using Cu alloys, silicon oxides and Li compounds within a composite by a simple mechanochemical milling process. The three-dimensionally driven ball mill used as a mechanochemical apparatus in this study can independently control two axes and can perform combined milling and frictional movements realized by adjusting the rotational speed of the vessel. The composite consisting of silicon, lithium oxide and copper oxide using these movements has Si nanoparticles, amorphous silicon monoxide, and Si-Cu alloy compounds, and a layer of silicon oxide on its surface. The prepared composite achieved higher retention capacity, higher coulomb efficiencies of approximately 90% and longer-cycle performance than Si particles, indicating a considerable optimisation of electrical and ionic conductivities in the composite. As a result, the method developed enabled the control of Li content to compensate for the lack of Li ions in the composite and optimised cycle performance with Cu alloys, oxides and Li compounds in the composite.
为了实现高性能电化学阳极性能，通过简单的机械化学研磨工艺，将具有改善循环性能的阳极活性材料与铜合金、氧化硅和锂化合物在复合材料中进行复合。本研究中用作机械化学装置的三维驱动球磨机可以独立控制两个轴，并且可以通过调节容器的转速来实现组合研磨和摩擦运动。利用这些运动形成的由硅、氧化锂和氧化铜组成的复合材料具有硅纳米颗粒、非晶态一氧化硅和硅铜合金化合物，并且在其表面有一层氧化硅。制备的复合材料比硅颗粒具有更高的保留容量、约90%的更高库仑效率和更长的循环性能，表明复合材料中的电导率和离子电导率得到了显著优化。结果，所开发的方法能够控制锂含量以补偿复合材料中锂离子的不足，并通过复合材料中的铜合金、氧化物和锂化合物优化循环性能。
