Functionalization-assistant ball milling towards Si/graphene anodes in high performance Li-ion batteries
| Autor: | Jingxiao Wang, Fanghua Tian, Zhou Su, Shuang Yuan, Chao Zhou, Sen Yang, Qian Shi, Yangqin Cheng, Yanjun Zhang, Jinhua Song, Yang Wang, Yin Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Graphene Composite number Nanoparticle Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Anode law.invention Chemical bond Covalent bond law Surface modification General Materials Science 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Carbon. 181:300-309 |
| ISSN: | 0008-6223 |
| Popis: | Due to difficulties with scalability and practical utilization, Si/graphene composites are not yet used as anodes for commercially available lithium-ion batteries. In this paper, we report an accessible and cost-effective ball-milling route to synthesize Si and graphene composites. By introducing amino- and carboxyl-groups, covalent linkage between Si nanoparticles and graphene is created, which solves serious issues of hybrids like poor dispersion and weak connection. This composite features a unique structure, where Si nanoparticles are uniformly attached to the surface or embedded into the inter-layers of the graphene. When used as anodes of lithium-ion batteries, this composite can retain a reversible capacity of 1516.23 mAh g−1 after 100 cycles at 100 mA g−1. It also exhibited excellent ultra-long-term cycling stability and high rate performance. The electrochemical performance is superior to most reported Si/graphene composites without chemical bonds at the interface, which indicates that covalent bonding can effectively inhibit the irreversible sliding of Si nanoparticles. In addition, EIS measurement had revealed a lower transfer resistance and faster Li-ions diffusion of Si@APTES/f-Gr, suggesting the integrity of graphene after functionalization. The proposed functionalization-assisted ball-milling approach, therefore, probably enables the large-scale production of Si/Graphene as anodes in high-performance batteries in the future. |
| Databáze: | OpenAIRE |
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