AUTHOR=Liao Yuanhong , Liang Kang , Ren Yurong , Huang Xiaobing 

TITLE=Fabrication of SiOx-G/PAA-PANi/Graphene Composite With Special Cross-Doped Conductive Hydrogels as Anode Materials for Lithium Ion Batteries

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00096

DOI=10.3389/fchem.2020.00096

ISSN=2296-2646

ABSTRACT=<p>Silicon oxides (SiO<sub>x</sub>) have been considered to be the likeliest material to substitute graphite anode for lithium-ion batteries (LIBs) due to its high theoretical capacity, appropriate working potential plus rich abundance. Nevertheless, the two inherent disadvantages of volume expansion and low electrical conductivity of SiO<sub>x</sub> have been a main obstacle to its application. Here, SiO<sub>x</sub>-G/PAA-PANi/graphene composite has been successfully synthesized by <italic>in-situ</italic> polymerization, in which SiO<sub>x</sub>-G particles linked together by a graphene-doped polyacrylic acid-polyaniline conductive flexible hydrogel and SiO<sub>x</sub>-G is encapsulated inside the conductive hydrogel. We demonstrate that SiO<sub>x</sub>-G/PAA-PANi/graphene composite possesses a discharge-specific capacity of 842.3 mA h g<sup>−1</sup> at a current density of 500 mA g<sup>−1</sup> after a cycle life of 100 cycles, and a good initial coulombic efficiency (ICE) of 74.77%. The superior performance probably due to the lithium ion transmission rate and the electric conductivity enhanced by the three-dimensional (3D) structured conductive polymer hydrogel.</p>