Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (11): 16-21.doi: 10.13475/j.fzxb.20210807406

• Fiber Materials • Previous Articles     Next Articles

Preparation and performance of lithium iron phosphate/carbon black/carbon nanofibers flexible cathode

ZHANG Changhuan1, LI Xianxian1, ZHANG Liran1, LI Deyang1, LI Nianwu2, WU Hongyan1()   

  1. 1. School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
    2. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2021-08-19 Revised:2022-06-22 Online:2022-11-15 Published:2022-12-26
  • Contact: WU Hongyan E-mail:hongye419@126.com

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Abstract:

In order to achieve flexibility of the electrode material for flexible lithium-ion batteries, a self-supporting lithium iron phosphate/carbon black/carbon nanofibers (LiFePO4/CB/CNFs) flexible cathode was developed by a combination of electrospinning and heat treatment. The results show that the olivine structure LiFePO4 is formed after heat treatment. The prepared flexible LiFePO4/CB/CNFs cathode is a three-dimensional network structure nanomaterial with a high porosity. The CB and active material LiFePO4 are uniformly embedded in the CNF matrix. The CB did not affect the LiFePO4 crystal structure during the formation of the active material. When the CB mass ratios are set to 0.10% and 0.15%, flexible composite cathode demonstrates good electrochemical reversibility, the first discharge specific capacity is 141.1 and 139.1 mA·h/g, respectively, and the coulombic efficiency is 87.3% and 87.6% for first cycle, respectively. The discharge specific capacity performance is relatively stable during 100 cycles, and the coulombic efficiency is maintained at about 99% from 2 to 100 cycle.

Key words: electrospinning, flexible cathode, lithium iron phosphate, carbon black, carbon nanofiber

CLC Number: 

  • TM910

Fig.1

SEM images of electrospun LiFePO4 precursor/CB/PAN nanofiber composite film with different mass ratio of CB before and after heat treatment. (a)Before heat treatment; (b)After pro-oxidation; (c)After carbonization"

Fig.2

Photos of LiFePO4/carbon black/CNFs before (a) and after (b) bending"

Fig.3

XRD spectra of LiFePO4/CB/CNFs flexible cathode with different mass ratio of CB"

Fig.4

TEM (a) and HRTEM (b) images of LiFePO4/CB/CNFs flexible cathode"

Fig.5

EIS of half cells assembled with LiFePO4/CB/CNFs flexible cathode"

Fig.6

CV curve of half cells assembled with LiFePO4/CB/CNFs flexible cathode"

Fig.7

Electrochemical performance curve of half cells assembled with LiFePO4/CB/CNFs flexible cathode with different weight of CB. (a) Initial charge and discharge; (b) Cycle performance"

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