Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 7-13.doi: 10.13475/j.fzxb.20180706107

• Fiber Materials •     Next Articles

Morphology and structure reconstruction and mechanism of Sn/C nanofibers anode for lithium battery

ZHAO Jinyang, SUN Yao, ZHANG Xin, ZHANG Yueyue, ZHAO Haoyue, XIA Xin()   

  1. College of Textiles and Clothing, Xinjiang University, Urumqi, Xinjiang 830046, China
  • Received:2018-07-24 Revised:2019-04-26 Online:2019-08-15 Published:2019-08-16
  • Contact: XIA Xin E-mail:xjxiaxin@163.com

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Abstract:

In order to improve the morphology and structure of Sn/C nanofibers and obtain excellent lithium electrical properties, Sn/C precursor nanofibers were prepared from polyacrylonitrile as the carbon source and Sn(CH3COO)2 as the precursor by electrospinning. Sn/C nanofibers with a porous and skin-core structure were prepared by different sequences of carbonization and a cryogenic treatment process. By means of morphology characterization, specific surface area analysis and crystal structure analysis, the structure and properties of the nanofibers were tested. The results show that the porous and the special carbon coated structure effectively prevents the agglomeration of the Sn particles, relieves the volume expansion to reduce the capacity loss, and increases the conductivity and the structural stability of the material. The Sn/C nanofibers with a porous structure obtained by cryogenic treatment before carbonization exhibit the most stable electrochemical performance, and the specific capacity retention after 100 cycles is as high as 93.9%.

Key words: Sn/C nanofiber, cryogenic treatment, carbonization, porous structure, skin-core structure, electrochemical property

CLC Number: 

  • TS195

Fig.1

Temperature control curve of cryogenic tank"

Fig.2

SEM images of Sn/C precursor nanofibers before (a) and after (b) cryogenic treatment"

Fig.3

SEM and TEM images of Sn/C nanofibers obtained by different process .(a) SEM image of Sn/C (Ⅰ) nanofibers;(b) TEM image of Sn/C (Ⅰ) nanofibers;(c) SEM image of Sn/C(Ⅱ) nanofibers; (d) TEM image of Sn/C (Ⅱ) nanofibers;(e) SEM image of Sn/C (Ⅲ) nanofibers;(f) TEM image of Sn/C (Ⅲ) nanofibers"

Fig.4

Nitrogen adsorption/desorption and pore size distribution of Sn/C nanofibers obtained by different process. (a) Nitrogen adsorption/desorption curve of Sn/C (Ⅰ);(b)Pore size distribution of Sn/C (Ⅰ); (c) Nitrogen adsorption/desorption curve of Sn/C(Ⅱ); (d) Pore size distribution of Sn/C(Ⅱ) ;(e) Nitrogen adsorption/ desorption curve of Sn/C(Ⅲ);(f) Pore size distribution of Sn/C(Ⅲ)"

Fig.5

XRD patterns of Sn/C nanofibers obtained by different process"

Fig.6

Constant current charge-discharge curve of Sn/C (Ⅰ)(a),Sn/C(Ⅱ) (b), Sn/C(Ⅲ) (c) and capacity differential curve(d)"

Fig.7

Cycling performance of Sn/C nanofibers obtained by different process"

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