Scalable Synthesized High-Performance Si-C Hybrid for Lithium Batteries

作     者：Shen, Liao Xu, Chengjie Gao, Jingguo Tao, Jianming Wang, Chundong Chen, Yue Lin, Yingbin Huang, Zhigao Li, Jiaxin 

作者机构：College of Physics and Energy Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center Fujian Normal University Fuzhou350117 China Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou350117 China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou350117 China School of Optical and Electronic Information Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Lithium ion batteries 

摘      要：At present, developing a simple strategy to effectively solve the shackles of volume expansion, poor conductivity and interface compatibility faced by Si-C anode in lithium batteries (LIBs) is the key to its commercialization. Here, low-cost nano-Si powders were prepared from Si-waste of solar-cells by sanding treatment, which can effectively reduce the commercialization cost for Si-C anode. Furthermore, micro-nano structural materials of Gr@Si/C/TiO2, with graphite as the inner core, TiO2-doped and carbon-coated Si as the outer coating-layer, were synthesized, realizing single batch kilogram-scale preparation. Herein, for the Gr@Si/C/TiO2 anodes, TiO2-doped carbon layer can effectively improve its conductivity, reduce electrode polarization, improve the e- and Li+ transport dynamics, and improve the interface compatibility with electrolyte. Accordingly, Gr@Si/C/TiO2 composites can output excellent LIB performance, especially with high initial Coulombic efficiency (ICE) of 82.51% and large average reversible capacity of ~810 mAh g−1 at 0.8 A g−1 after 1000 cycles. Moreover, Gr@Si/C/TiO2 303450-prototype pouch full cells assembled with LiNi0.8Co0.1Mn0.1O2 (NCM811) as cathode, deliver impressive energy density of ~489.3 Wh kg-1 based on the total weight of active materials, and stable cycling performance with an average capacity of ~300 mAh after 270 cycles at 1.0 C, suggesting its promising application in the high energy-density LIBs. © 2022, The Authors. All rights reserved.