Application And Study Of Polysulfonamide Polyners In Lithium Ion Battery Separator

In this work,a sponge-like polysulfonamide（PSA）/SiO₂ composite membrane is unprecedentedly prepared by the phase inversion method,and successfully demonstrated as a novel separator of lithium-ion batteries（LIBs）.Compared to the commercial polypropylene（PP）separator,the sponge-like PSA/SiO₂ composite possesses better physical and electrochemical properties,such as higher porosity（83%）,ionic conductivity（0.75 S/cm）,thermal stability and flame retarding ability.The LiCoO₂/Li half-cells using the sponge-like composite separator demonstrate superior rate capability and cyclability over those using the commercial PP separator.Moreover,the sponge-like composite separator can ensure the normal operation of LiCoO₂/Li half-cell at an extremely high temperature of 90?C,while the commercial PP separator cannot.In order to further improve the mechanical strength of the PSA/SiO₂ composite membrane,we used polyethylene terephthalate（PET）as the substrate to achieve better mechanical strength of the PSA/SiO₂/PET composite membrane（PSST）.The PSST composite separator are used in LiFePO₄/Li half-cells,and also have showed outstanding cycling performance in comparison with commercial PP separator.All these encouraging results suggest that this phase inversion-based sponge-like PSA/SiO₂ composite separator is really a promising separator for high performance LIBs.