Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (06): 57-62.doi: 10.13475/j.fzxb.20200902306

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Preparation and electrochemical properties of liquid GaSn self-repairing anode materials for lithium-ion batteries

CHEN Yu1,2, XIA Xin1,2,3()   

  1. 1. College of Textile and Clothing, Xinjiang University, Urumqi, Xinjiang 830046, China
    2. School of Chemical Engineering and Technology, Xinjiang University, Urumqi, Xinjiang 830046, China
    3. Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai 201620, China
  • Received:2020-09-09 Revised:2021-03-16 Online:2021-06-15 Published:2021-06-25
  • Contact: XIA Xin E-mail:xjxiaxin@163.com

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Abstract:

In order to solve the inherent volume expansion problem of current lithium-ion battery anode materials, gallium tin (GaSn) alloy that was liquid at room temperature was used as the lithium-ion battery anode material. The liquid GaSn alloy was bound inside the nanofibers and the network structure of nanofibers by electrospinning, and then assembled into lithium-ion batteries. The structure and performance of the batteries were characterized and analyzed. The results show that the liquid GaSn alloy can be evenly dispersed in the carbon nanofibers, and at the same time, the GaSn alloy forms small liquid droplets due to ultrasonic cavitation, which are gradually fixed into large droplets due to fluidity and high surface tension during the cycle. It is conducive to better display of the self-healing properties of the electrode material, and it can effectively repair the cracks generated during the battery cycle. After 100 cycles of charging and discharging test, the capacity retention rate of the battery reaches 94.8%.

Key words: liquid alloy, self-repair, lithium-ion battery, anode material, electrochemical property, electrospinning

CLC Number: 

  • TB34

Fig.1

Preparation process of GaSn liquid alloy particles"

Fig.2

Physical figures of GaSn liquid alloy appearance changes before(a)and after(b)ultrasonic treatment"

Fig.3

Optical microscope figure of liquid GaSn particle dispersion. (a)Overall picture;(b)Enlarged picture"

Fig.4

Ultra depth of field 3-D system image of GaSn/C nanofiber precursor film. (a) Partial figure; (b) Partial detail figure"

Fig.5

TEM and SEM images of GaSn/C nanofiber films. (a) TEM image; (b) SEM image; (c) Ga distribution;(d)Sn distribution"

Fig.6

TG-DTA figure of GaSn/C nanofiber films"

Fig.7

Electrochemical performance curve of GaSn/C battery. (a) Charge and discharge curve; (b) Cycle performance"

Fig.8

Schematic diagram of state change of liquid alloy during cycling"

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