Boron-doped three-dimensional porous carbon framework/carbon shell encapsulated silicon composites for high-performance lithium-ion battery anodes

Junkai Zhao*, Bo Wang, Ziheng Zhan, Meiyang Hu, Feipeng Cai, Konrad Świerczek, Kaimeng Yang, Juanna Ren, Zhanhu Guo, Zhaolong Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Deleterious volumetric expansion and poor electrical conductivity seriously hinder the application of Si-based anode materials in lithium-ion batteries (LIBs). Herein, boron-doped three-dimensional (3D) porous carbon framework/carbon shell encapsulated silicon (B-3DCF/Si@C) hybrid composites are successfully prepared by two coating and thermal treatment processes. The presence of 3D porous carbon skeleton and carbon shell effectively improves the mechanical properties of the B-3DCF/Si@C electrode during the cycling process, ensures the stability of the electrical contacts of the silicon particles and stabilizes the solid electrolyte interface (SEI) layer, thus enhancing the electronic conductivity and ion migration efficiency of the anode. The developed B-3DCF/Si@C anode has a high reversible capacity, excellent cycling stability and outstanding rate performance. A reversible capacity of 1288.5 mAh/g is maintained after 600 cycles at a current density of 400 mA g−1. The improved electrochemical performance is demonstrated in a full cell using a LiFePO4-based cathode. This study presents a novel approach that not only mitigates the large volume expansion effects in LIB anode materials, but also provides a reference model for the preparation of porous composites with various functionalities.

Original languageEnglish
Pages (from-to)790-800
Number of pages11
JournalJournal of Colloid and Interface Science
Volume664
Early online date11 Mar 2024
DOIs
Publication statusE-pub ahead of print - 11 Mar 2024

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