Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (1): 23-34.doi: 10.19799/j.cnki.2095-4239.2022.0437

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Performance of large-scale silicon particles coated with multistage carbon as anode materials for lithium-ion batteries

Han ZHENG(), Peipei LAI, Xiaohua TIAN, Zhuo SUN, Zhejuan ZHANG()   

  1. Engineering Research Center for Nanophotonics and Advanced Instrument (Ministry of Education), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
  • Received:2022-08-05 Revised:2022-09-13 Online:2023-01-05 Published:2023-02-08
  • Contact: Zhejuan ZHANG E-mail:zhenghan_1998@163.com;zjhang@phy.ecnu.edu.cn

Abstract:

Silicon-carbon composite materials within various carbon structures (SPU and SPU#PANI) were created using liquid phase wrapping and low-temperature pyrolysis, with large-size silicon particles (200—800 nm) from photovoltaic cell production waste as raw materials and water-based polyurethane (PU) and polyaniline (PANI) as carbon sources. The effects of carbon content, microstructure, and elemental doping on the electrochemical characteristics of SPU and SPU#PANI as anode materials for lithium-ion batteries were investigated. A low content of carbon composite in the SPU results in a high initial discharge capacity of up to 2193.6 mAh/g but poor charge and discharge cycle stability. However, the conductivity of SPU#PANI was increased after a secondary carbon composited. Additionally, it obtains a high discharge capacity (1488.8 mAh/g) as a result of the influence of porous carbon microstructure. The SPU#PANI's specific capacity was still over 756.8 mAh/g after 100 cycles, indicating good rate performance. The findings showed that the carbon with porous structure composite on the surface of large-size silicon particles serves not only a buffer for the expansion of the silicon in the process of charge and discharge but also a channel for lithium-ion transmission, significantly enhancing the electrochemical performance and stability of the silicon-based anode. The low-temperature pyrolysis technique used to composite multistage carbon on large-scale silicon particles provides a key reference for the industrialization technology development of silicon-based anode for lithium-ion batteries.

Key words: waterborne polyurethane, polyaniline, multistage carbon composite, anode, lithium ion battery

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