SiO2/Carbon Composite Microspheres with Hollow Core–Shell Structure as a High‐Stability Electrode for Lithium‐Ion Batteries. Issue 3 (11th January 2017) - Jiao, Miaolun
Abstract: The SiO2 /carbon composite material used as a lithium‐ion battery (LIB) anode was synthesized by aerosol spraying a mixture of polyvinyl alcohol (PVA) solution and SiO2 nanoparticles, followed by coating polyacrylonitrile (PAN) on the SiO2 /PVA surface and an annealing treatment at 800 °C. The as‐prepared SiO2 /po‐C@C has a hollow core–shell structure. The hollow section contributes to accommodate the volume expansion of SiO2 nanoparticles; the skeleton of porous carbon in the core not only enhances the electronic conductivity, but also provides the lithium‐ion diffusion path; the PAN‐based carbon shell benefits for forming a stable solid electrolyte interphase (SEI) film. This core–shell structure could partly alleviate the pulverization of the SiO2 /po‐C@C particles and also perform excellent electrochemical performances. Compared with the SiO2 @C composite, the SiO2 /po‐C@C composite possesses a high specific charge capacity of 669.8 mA h g −1 at a current density of 100 mA g −1 after 100 charge and discharge cycles with a high capacity retention of 98.6 %. Therefore, the SiO2 /po‐C@C composite with a hollow core‐shell structure shows great potential as an anode material for future LIBs. Abstract : Vacant possession : A SiO2 /po‐C@C composite used as a lithium‐ion battery anode material is synthesized by aerosol spraying, surface coating, and heat treatment. The hollow core–shell structure has sufficient vacant space to accommodate the huge volume changes, which can prevent the particles from pulverization and dramatic capacity loss. Meanwhile, this material exhibits great electrochemical performance in terms of high reversible capacity, excellent rate capability, and good cycle stability.