Longlong Fan, Yunfei Wang, Ze Sun, Xiaolei Sun, Li Qiao
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引用次数: 0
摘要
硅具有较高的理论比容量和较低的锂化/去锂化电压,是极具发展前景的负极材料。然而,由于硅在锂化和衰减过程中体积变化较大,其循环稳定性较差,限制了其在储能技术中的实际应用。本文采用静电纺丝和磁控溅射相结合的方法制备了具有中空结构的C/Si纳米纤维。空心结构为缓解循环过程中硅的体积变化提供了必要的缓冲空间,更薄的表面层通过缩小扩散通道加速了锂离子的扩散。空心C/Si纳米纤维(h -C/Si NFs)表现出优异的锂存储性能,在0.1 ag−1下循环80次后保持1262.9 mA h g−1的容量,在2 ag−1下表现出654.2 mA h g−1的优异倍率能力。
Fabrication of hollow C/Si nanofibers as binder-free anodes for lithium-ion batteries
Silicon is the anode material with great prospects thanks to its high theoretical specific capacity and lower lithiation/delithiation voltages. Nonetheless, the poor cycling stability of silicon, which is attributed to the considerable volume changes during lithiation and delithiation, restricts its practical application in energy storage technologies. Within this work, C/Si nanofibers with a hollow structure were prepared using electrospinning combined with magnetron sputtering. The hollow structure provides essential buffer space to alleviate the volume changes of silicon during the cycling process, and the thinner surface layer accelerates lithium-ion diffusion by narrowing the diffusion channel. The hollow C/Si nanofibers (H-C/Si NFs) exhibit superior lithium storage performance, retaining a capacity of 1262.9 mA h g−1 after 80 cycles at 0.1 A g−1 and demonstrating excellent rate capability with 654.2 mA h g−1 at 2 A g−1.
期刊介绍:
Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.