Ti Modified Hollow Silicon-Based Nanofiber Negative Electrode

近几十年来，锂离子电池由于低成本、高工作电压、长循环寿命，已成为工业电源和家用电子设备领域必不可少的储能设备。然而，由于石墨负极理论比容量相对较低，已无法满足不断增长的市场需求。在众多的负极材料中，硅材料一直以其高理论容量而得到广泛研究，但硅材料在与锂离子形成合金的过程中存在巨大的体积变化，会导致材料的破裂和粉化，导电性变差等问题。本文设计制备出Ti金属修饰的中空纳米纤维，具有优异的电化学性能，电极在0.1 A/g电流密度下循环50次，仍有1186.26 mAh/g高可逆比容量，首次库伦效率高达71%；在0.5 A/g电流密度下循环200次后，放电比容量高达968.19 mAh/g。In recent decades, lithium-ion batteries have become an essential energy storage device in the fields of industrial power and household electronic devices due to their low cost, high operating voltage, and long cycle life. However, due to the relatively low theoretical specific capacity of graphite anodes, they are no longer able to meet the growing market demand. Among numerous negative electrode materials, silicon materials have been widely studied for their high theoretical capacity. However, during the process of forming alloys with lithium ions, silicon materials undergo significant volume changes, which can lead to material fracture and pulverization, as well as decreased conductivity. This article designs and prepares Ti metal modified hollow nanofibers with excellent electrochemical performance. The electrode has a high reversible specific capacity of 1186.26 mAh/g after 50 cycles at a current density of 0.1 A/g, and the first coulombic efficiency is as high as 71%; After 200 cycles at a current density of 0.5 A/g, the discharge specific capacity reached 968.19 mAh/g.