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      Engineering of Silicon Core‐Shell Structures for Li‐ion Anodes

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      https://www.riss.kr/link?id=O111400869

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      The amount of silicon in anode materials for Li‐ion batteries is still limited by the huge volume changes during charge‐discharge cycles. Such changes lead to the loss of electrical contacts, as well as mechanical and surface electrolyte interphas...

      The amount of silicon in anode materials for Li‐ion batteries is still limited by the huge volume changes during charge‐discharge cycles. Such changes lead to the loss of electrical contacts, as well as mechanical and surface electrolyte interphase (SEI) instabilities, strongly reducing the cycle life. Core‐shell structures have attracted a vast research interest due to the possibility of modifying some properties with a judicious choice of the shell. It is, for example, possible to improve the electronic conductivity and ionic diffusion, or buffer volume variations. This review gives a comprehensive overview of the recent developments and the different strategies used for the design, synthesis and electrochemical performance of silicon‐based core‐shells. It is based on a selection of the main types of silicon coatings reported in the literature, including carbon, inorganic, organic and double‐layer coatings, Finally, a summary of the advantages and drawbacks of these different types of core‐shells as anode materials for Li‐ion batteries and some insightful suggestions in regards to their use are provided.
      The core‐shell architecture has been recognized as one of the most promising solutions to enable higher silicon content in Li‐ion anodes. In this review, we report different types of coatings on silicon particles including carbon, inorganic, organic and double‐layer shells from some selected examples. The synthesis methods, structure characterization, main properties and resulting electrochemical performance are outlined. Improvements over silicon are decrypted and trends for future works are objectively identified.

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