Silicon Nanoparticles Within the Carbonized SU-8 Cages as A Micro Lithium-Ion Battery Anode
| Autor: | Xiaohong Wang, Xiaozhao Li, Jiangfeng Xiang, Xuanlin Kuang, Siwei Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Nanocomposite
Materials science Silicon Mechanical Engineering Nanoparticle chemistry.chemical_element 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Anode Chemical engineering Resist chemistry Graphite Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Microelectromechanical Systems. 27:201-209 |
| ISSN: | 1941-0158 1057-7157 |
| Popis: | Silicon as the anode materials for lithium batteries has over tenfold higher specific capacity than that of the commercial graphite. However, it suffers from poor recyclability and large volume expansion (~400%) during the lithiation and delithiation processes. Here, we develop an effective approach to fabricate a novel silicon/void/carbon (Si/void/C) anode used in micro lithium-ion batteries. The silicon nanoparticles (SiNPs) in the anode materials enable the high capacity, while the carbonized SU-8 provides a structural support and also facilitates the fast lithium-ions transport between the electrolyte and the silicon. The nano-void space between SiNPs and carbon scaffold provides enough space for the expansion of SiNPs during intercalation and de-intercalation of lithium-ions into the anode; moreover, it is also very helpful to reduce the damage of the carbon structure and offer high cycle life. To balance the specific capacity and the stability, the Si/void/C nanocomposite with the weight ratio of 60/0/40 shows the highest specific capacity retention of 1200 mAh/g after 80 cycles with 2200 mAh/g as the initial specific capacity. In the future, the micro lithium-ion batteries can be directly prototyped on chip by the lithography techniques. [2017-0192] |
| Databáze: | OpenAIRE |
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