|
1
|
Xiong M, Bie X, Dong Y, Wang B, Zhang Q, Xie X, Liu T, Huang R. Encapsulation of Silicon Nano Powders via Electrospinning as Lithium Ion Battery Anode Materials. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16093566. [PMID: 37176448 PMCID: PMC10180224 DOI: 10.3390/ma16093566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 04/21/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023]
Abstract
Silicon-containing polyester from tetramethoxysilane, ethylene glycol, and o-Phthalic anhydride were used as encapsulating materials for silicon nano powders (SiNP) via electrospinning, with Polyacrylonitrile (PAN) as spinning additives. In the correct quantities, SiNP could be well encapsulated in nano fibers (200-400 nm) using scanning electron microscopy (SEM). The encapsulating materials were then carbonized to a Si-O-C material at 755 °C (Si@C-SiNF-5 and Si@C-SiNF-10, with different SiNP content). Fiber structure and SiNP crystalline structure were reserved even after high-temperature treatment, as SEM and X-ray diffraction (XRD) verified. When used as lithium ion battery (LIB) anode materials, the cycling stability of SiNPs increased after encapsulation. The capacity of SiNPs decreased to ~10 mAh/g within 30 cycles, while those from Si@C-SiNF-5 and Si@C-SiNF-10 remained over 500 mAh/g at the 30th cycle. We also found that adequate SiNP content is necessary for good encapsulation and better cycling stability. In the anode from Si@C-SiNF-10 in which SiNPs were not well encapsulated, fibers were broken and pulverized as SEM confirmed; thus, its cycling stability is poorer than that from Si@C-SiNF-5.
Collapse
Affiliation(s)
- Man Xiong
- School of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China
- School of Materials Science and Engineering, Hubei University, Wuhan 430060, China
| | - Xuan Bie
- School of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China
| | - Yawei Dong
- School of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China
| | - Ben Wang
- School of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China
| | - Qunchao Zhang
- School of Materials Science and Engineering, Hubei University, Wuhan 430060, China
| | - Xuejun Xie
- School of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China
| | - Tong Liu
- School of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China
- School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Ronghua Huang
- School of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China
| |
Collapse
|
|
2
|
Abstract
The thermal catalytic conversion of biomass is currently a prevalent method for producing activated carbon with superb textural properties and excellent adsorption performance. However, activated carbon suffers severely from its poor thermal stability, which can easily result in spontaneous burning. In contrast, silica material is famed for its easy accessibility, high specific surface area, and remarkable thermal stability; however, its broader applications are restricted by its strong hydrophilicity. Based on this, the present review summarizes the recent progress made in carbon-silica composite materials, including the various preparation methods using diverse carbon (including biomass resources) and silica precursors, their corresponding structure–function relationship, and their applications in adsorption, insulation, batteries, and sensors. Through their combination, the drawbacks of the individual materials are circumvented while their original advantages are maintained. Finally, several bottlenecks existing in the field of carbon-silica composites, from synthesis to applications, are discussed in this paper, and possible solutions are given accordingly.
Collapse
|