Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (04): 38-43.doi: 10.13475/j.fzxb.20180503906

• Fiber Materials • Previous Articles     Next Articles

Influence of deep cryogenic treatment temperature on lithium electrical properties of SnSb/C nanofiber anode material

LIU Huijie, XIA Xin()   

  1. College of Textiles and Clothing, Xinjiang Unversity, Urumqi, Xinjiang 830046, China
  • Received:2018-05-16 Revised:2019-01-05 Online:2019-04-15 Published:2019-04-16
  • Contact: XIA Xin E-mail:xjxiaxin@163.com

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Abstract:

In order to improve the electrochemical performance of SnSb/C nanofibers anodes for lithium-ion battery, the deep cryogenic treatment was used to modify the morphology of SnSb/C nanofibers, the influence of cryogenic temperature on the electrochemical performance was studied by comparing the changes of morphology, the specific surface area, the carbon contents and the charge-discharge curve of SnSb/C nanofibers. The results show that when the cryogenic temperature is -100 ℃, SnSb/C nanofiber has a rough surface with gullies. The cryogenic treatment accelerates the preoxidation reaction speed of polyacrylonitrile, so that the decomposition temperature decrease, the carbon content is up to 75.4% and the specific surface increases to 214.0 m2/g. Besides, owing to the influence of deep cryogenic treatment on the morphology of SnSb/C nanofibers, the battery capacity sustainably increases during the cycling of the lithium ion battery. After 120 cycles, the capacity retention ratio is still 123.5%.

Key words: SnSb/C nanofiber anode material, lithium battery, deep cryogenic treatment, cycle performance, electrochemical property

CLC Number: 

  • O646.21

Fig.1

Temperature control curve of cryogenic tank"

Fig.2

SEM images of SnSb/C nanofibers with different cryogenic treatment temperature. (a)Without cryogenic treatment;(b)Cryogenically temperature is -50 ℃; (c) Cryogenically temperature is -100 ℃; (d) Cryogenically temperature is -150 ℃"

Fig.3

TG curves of SnSb/C nanofibers precursor with different cryogenic treatment temperature"

Fig.4

Nitrogen adsorption/desorption isotherms of SnSb/C nanofibers treated at different cryogenic treatment temperature"

Fig.5

XRD patterns of SnSb/C nanofibers treated at different cryogenic treatment temperature"

Fig.6

Chage/dischage curves of SnSb/C nanofibers treated at different cryogenic treatment temperature. (a)Without cryogenic treatment; (b)Cryogenically temperature is -50 ℃;(c) Cryogenically temperature is -100 ℃;(d) Cryogenically temperature is -150 ℃"

Fig.7

Cycling efficiency curves of SnSb/C nanofibers treated at different cryogenic treatment temperature"

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