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Controllable and Large-scale Preparation of High-purity Nanosilicon and Electrochemical Performance
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Ningxia Key Laboratory of Photovoltaic Materials

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TM912

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    Abstract:

    Silicon(Si) has become one of the hot spots in the research of anode materials in lithium-ion batteries (LIBs) for its highest lithium intercalation capacity among known elements. However, the large volume expansion (~300%) of Si due to the lithium intercalation restricts its application in LIBs. Nano-crystalized is an effective solution to resolve the volume expansion. Nano-Si was prepared by high-energy electron beam and mechanical grinding method, using metallurgical Si. According to scanning electron microscopy (SEM) observation, the molten Si was deposited into Si nanofibers with a linear diameter of about 40nm after evaporation under the action of high-energy electron beam, and then gathered into Si nanobundles, and the size distribution of nano-Si particles after mechanical grinding is uniform. The results of electrochemical tests show that the first reversible capacity is 1292.4mAh/g, and the charge transfer impedance fitting value is 51.36Ω, under the condition of the nano-Si purity reaches more than 99.96% and the discharge density is 100mAh/g. The experimental results indicates that this method can be applied to controllable and large-scale prepare nano-Si, and gives a guidance that how to scalable use Si in LIBs industry.

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[ZHANG Dian-ping, LI Jin, SU Shao-peng, LI Yang. Controllable and Large-scale Preparation of High-purity Nanosilicon and Electrochemical Performance[J]. Rare Metal Materials and Engineering,2021,50(10):3739~3744.]
DOI:10.12442/j. issn.1002-185X.20200827

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History
  • Received:October 27,2020
  • Revised:December 16,2020
  • Adopted:December 23,2020
  • Online: October 28,2021
  • Published: October 25,2021