Mass production of three-dimensional hierarchical microfibers constructed from silicon–carbon core–shell architectures with high-performance lithium storage |
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| Affiliation: | 1. Institute for Superconducting & Electronic Materials, University of Wollongong, NSW 2522, Australia;2. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China;3. School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, NSW 2500, Australia;1. Department of Energy Materials Science and Engineering, Dongguk University-Seoul, 100-715, Seoul, Republic of Korea;2. Division of Materials Science and Engineering, Hanyang University, Haengdang 1-dong, Seongdong-gu, Seoul, 133-791, Republic of Korea;3. Research Facility center, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784, Republic of Korea;1. Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea;2. Department of Energy Science, Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea;3. LPICM CNRS, École polytechnique, Palaiseau 91120, France;4. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, People’s Republic of China;5. Institute of Physics, Chinese Academy of Sciences, National Centre for Nanoscience and Technology, Beijing 100080, People’s Republic of China;1. Engineering Research Center for Eco-Dying & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China;2. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China;3. Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, NC 27695-8301, USA;4. Dyeing and Finishing Institute of Zhejiang Sci-Tech University, Zhejiang Sci-Tech University, Hangzhou 310018, China;1. Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, NC 27695-8301, USA;2. Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China;3. College of Textile and Clothing, Xinjiang University, Urumqi, Xinjiang 830046, China |
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| Abstract: | In this work, a facile approach is reported to mass produce highly porous fibers constructed from silicon–carbon core–shell structures. The C–Si microfibers are prepared using a modified electrospinning deposition method (ESD), and subsequent calcination of the carbon shells. Benefited from the step of vacuum drying, the unnecessary solvent left in the precursor will volatilize, resulting in the uniform three-dimensional hierarchical microfibers constructed from silicon–carbon core–shell architectures. The uniform covering layers of carbon formed by decomposition of polymer contribute to the improvement of conductivity and alleviation of volume change. The pores in the microfibers are helpful for the diffusion of electrolyte. When evaluated as an anode material for lithium-ion batteries, the C–Si microfibers exhibit improved reversibility and cycling performance compared with the commercial Si nanoparticles. A high capacity of 860 mAh g?1 can be retained after 200 cycles at a current rate of 0.3 C. The rate capability of the C–Si microfibers is also improved. The special structure is believed to offer better structural stability upon prolonged cycling and to improve the conductivity of the material. This simple strategy using the modified ESD method could also be applied to prepare other porous energy materials. |
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