The high performances of SiO_2-coated melt-blown non-woven fabric for lithium-ion battery separator

摘要

This paper reports a kind of composite separator which is prepared by adopting polypropylene melt-blown non-woven fabric as base material, and coating nano-SiO2 particles on its unilateral side. This paper also observes the morphology of separators and character the pore size, thermal stability, and electrochemical performance of separators. Results show that: filling nano-SiO2 particles into polypropylene melt-blown non-woven fabric could improve the thermal stability, ionic conductivity, and pore size distribution of polypropylene melt-blown non-woven fabric, especially, the C-rate performance. When the coating solution reaches 15 wt.%, the c-rate performance of separator reaches a higher value of 152 mAh.g(-1) at 0.2 C and 89mAh.g(-1) at 5 C, which was more excellent than c-rate performance of other composite separators and pp membrane. Such kind of designing used new preparation process and will to be a promising separator for power lithium-ion battery.