4.8 Article

Ultrahigh line-capacity and flexible graphene/carbon nanotube/tin oxide fibers as sodium ion battery anodes

Journal

ENERGY STORAGE MATERIALS
Volume 48, Issue -, Pages 35-43

Publisher

ELSEVIER
DOI: 10.1016/j.ensm.2022.03.002

Keywords

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Funding

  1. Innovation Program of Shang-hai Municipal Education Commission [2017-01-07-00-03-E00055]
  2. Science and Technology Commission of Shanghai Municipal-ity [20JC1414900]
  3. National Natural Science Foundation of China
  4. Program for Changjiang Scholars and Innovative Research Team in University [IRT16R13]
  5. DHU Dis-tinguished Young Professor Program and Graduate Student Innovation Fund of Donghua University [CUSF-DH-D-2019023]
  6. Joint Funds of the National Natural Science Foundation of China [U20A20257]
  7. [52090033/52090030/52103076]

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In this study, a porous graphene/carbon nanotube/tin oxide (PP-GCS) fiber was successfully fabricated, showing excellent electrochemical performance and high line capacity. This work provides a promising method for the production of flexible power devices.
As one dimensional substrate, carbon based fibers have been paid sufficient attention and acquired extensive success in wearable energy storage devices due to fascinating characteristics, such as excellent conductivity, porous structure and outstanding flexibility. However, there is still a severe challenge to assemble fiber shaped anode for flexible power devices with high line capacity. Herein, porous graphene/carbon nanotube/tin oxide (PP-GCS) fiber was successfully fabricated via wet spinning following freeze-dried and finally mechanical power derived rearrangement. The oriented structure by mechanical power provided a desired skeleton and endowed a flexible characteristic for fiber. The porous structure could form sufficient open channels to guarantee the fast diffusion of electrolyte, resulting in that PP-GCS fiber presented an excellent electrochemical performance, especially remarkable line capacity. The assembled fiber shaped sodium-ion batteries (SIBs) demonstrated a stable cycle performance in the discharge capacity increased from 290.9 to 309 mAh g(-1) (4.8-5.1 mAh m(-1)) after 100 cycles at 0.05 A g(-1) and reversible capacity of 164.1 mAh g(-1) (2.71 mAh m(-1)) at 0.5 A g(-1). Besides, with the increase of PP-GCS fiber's diameter, the highest line capacity of porous fiber reached 15.74 mAh m(-1) at a current density of 0.05 A g(-1). This work provided a promising preparation method for high energy device in next-generation wearable electronics.

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