期刊
CARBON
卷 181, 期 -, 页码 300-309出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.05.024
关键词
Si/graphene composite; Functionalization; Ball-milling; Strong interaction; Lithium-ion battery
资金
- National Natural Science Foundation of China [91963111, 52071255, 51507125]
- Key Scientific and Technological Innovation Team of Shaanxi province [2020TD001]
- Innovation Capability Support Program of Shaanxi [2018 PT-28, 2017KTPT-04]
- Fundamental Research Funds for the Central Universities (China)
- WorldClass Universities (Disciplines)
- Characteristic Development Guidance Funds for the Central Universities
The paper presents a cost-effective method for synthesizing Si and graphene composites through ball-milling, demonstrating their outstanding performance in lithium-ion batteries and potential for large-scale production in the future.
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 re-ported 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. (C) 2021 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据