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

Silicon oxides (SiO x ) 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 x have been a main obstacle to its application. Here, SiO x -G/PAA-PANi/graphene composite has been successfully synthesized by in-situ polymerization, in which SiO x -G particles linked together by a graphene-doped polyacrylic acid-polyaniline conductive flexible hydrogel and SiO x -G is encapsulated inside the conductive hydrogel. We demonstrate that SiO x -G/PAA-PANi/graphene composite possesses a discharge-specific capacity of 842.3 mA h g −1 at a current density of 500 mA g −1 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.