Embedding submicron SiO2 into porous carbon as advanced lithium-ion batteries anode with ultralong cycle life and excellent rate capability

摘要

The SiO2/C composites with submicron SiO(2 )particles fully embedded into the porous carbon are prepared via a facile, environmentally benign and cost-effective method. The electrochemical performances of the SiO2/C composites are found to be related to its carbon content. For the SiO2/C composites with C contents ranging from 5 wt% to 23 wt%, the sample with 14 wt % carbon delivers the highest reversible capacity of 653 mAh/g (based on the mass of the SiO2/C composite) at 100 mA/g and retained the reversible capacity of 620 mAh/g after 150 cycles. Even at a current density of 1.0 A/g, it still delivers a reversible capacity of 534 mAh/g over 1000 cycles, which is the best cycle performance reported for the SiO(2 )anode materials. The ultralong cycle life and excellent rate capability can be attributed to both the porous carbon matrix and the favorable connection between SiO2 particles and porous carbon. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.