Xu Liguo, Chen Yanwu, Liu Peijiang, Zhan Jianghua
College of Light Chemical Industry and Materials Engineering, Shunde Polytechnic, Foshan 528333, China.
Reliability Research and Analysis Centre, China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou 510610, China.
Materials (Basel). 2022 Jul 13;15(14):4875. doi: 10.3390/ma15144875.
Commercial polyolefin separators exhibit problems including shrinkage under high temperatures and poor electrolyte wettability and uptake, resulting in low ionic conductivity and safety problems. In this work, core-shell silica-polyphosphazene nanoparticles (SiO@PZS) with different PZS layer thicknesses were synthesized and coated onto both sides of polyethylene (PE) microporous membranes to prepare composite membranes. Compared to pure silica-coated membranes and PE membranes, the PE-SiO@PZS composite membrane had higher ionic conductivity. With the increase in the SiO@PZS shell thickness, the electrolyte uptake, ionic conductivity and discharge capacity gradually increased. The discharge capacity of the PE-SiO@PZS composite membrane at 8 C rate was 129 mAh/g, which was higher than the values of 107 mAh/g for the PE-SiO composite membrane and 104 mAh/g for the PE membrane.
商业化聚烯烃隔膜存在一些问题，包括高温下收缩、电解质润湿性和吸收率差，导致离子电导率低以及安全问题。在这项工作中，合成了具有不同聚磷腈（PZS）层厚度的核壳结构二氧化硅-聚磷腈纳米颗粒（SiO@PZS），并将其涂覆在聚乙烯（PE）微孔膜的两侧以制备复合膜。与纯二氧化硅涂层膜和PE膜相比，PE-SiO@PZS复合膜具有更高的离子电导率。随着SiO@PZS壳层厚度的增加，电解质吸收率、离子电导率和放电容量逐渐增加。PE-SiO@PZS复合膜在8C倍率下的放电容量为129 mAh/g，高于PE-SiO复合膜的107 mAh/g和PE膜的104 mAh/g。
