4.6 Article

Synthesis of Si-Zn2SiO4 composite as Li-ion battery anodes and its electrochemical mechanism analysis

期刊

ELECTROCHEMISTRY COMMUNICATIONS
卷 138, 期 -, 页码 -

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2022.107284

关键词

Zinc silicate; Silicon; Anode; Reaction mechanism; Battery

资金

  1. National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2022R1A5A7000765, 2022R1A2C1011181]
  2. National Research Foundation of Korea [2022R1A2C1011181] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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In this study, a Si-Zn2SiO4 composite was designed and prepared by mechanical milling and heat treatment. The composite electrode showed a high reversible capacity without carbon incorporation, and exhibited stable cycling performance, which was attributed to the role of Zn2SiO4 in buffering the volume change of Si.
Zinc silicate (Zn2SiO4) is a promising anode material for Li-ion batteries, although its reversible capacity is relatively low. In this study, we designed a Si-Zn2SiO4 composite using a simple mechanical milling and heat treatment. The synthetic phase transformation from the starting materials to the final composite was confirmed via X-ray diffraction (XRD) analysis, and the morphology and microstructure of the composite were analyzed using electron microscopy techniques. The electrochemical test results demonstrated that the composite electrode exhibited a high reversible capacity of 715 mAh g(-1) after 400 cycles without carbon incorporation. Further, the electrochemical reaction mechanism of the Si-Zn2SiO4 composite electrode with Li was investigated via ex situ XRD analyses. The stable cycling stability of the electrode was attributed to the role of Zn2SiO4 in buffering the volume change of Si.

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