Liu Caiyuan, Fang Xin, Peng Hui, Li Yi, Yang Yonggang
Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
Molecules. 2023 Jul 10;28(14):5304. doi: 10.3390/molecules28145304.
The aim of this work is to effectively combine the advantages of polymer and ceramic nanoparticles and improve the comprehensive performance of lithium-ion batteries (LIBs) diaphragm. A flexible film composed of electro-spun P(VDF-HFP) nanofibers covered by a layer of mesoporous silica (P(VDF-HFP)@SiO) was synthesized via a sol-gel transcription method, then used as a scaffold to absorb organic electrolyte to make gel a electrolyte membrane (P(VDF-HFP)@SiO-GE) for LIBs. The P(VDF-HFP)@SiO-GE presents high electrolyte uptake (1000 wt%), thermal stability (up to ~350 °C), ionic conductivity (2.6 mS cm at room temperature), and excellent compatibility with an active Li metal anode. Meanwhile, F-doping carbon/silica composite nanofibers (F-C@SiO) were also produced by carbonizing the P(VDF-HFP)@SiO film under Ar and used to make an electrode. The assembled F-C@SiO|P(VDF-HFP)@SiO-GE|Li half-cell showed long-cycle stability and a higher discharge specific capacity (340 mAh g) than F-C@SiO|Celgard 2325|Li half-cell (175 mAh g) at a current density of 0.2 A g after 300 cycles, indicating a new way for designing and fabricating safer high-performance LIBs.
这项工作的目的是有效结合聚合物和陶瓷纳米颗粒的优势，提高锂离子电池（LIBs）隔膜的综合性能。通过溶胶-凝胶转录法合成了一种由电纺聚（偏氟乙烯-六氟丙烯）（P(VDF-HFP)）纳米纤维组成且覆盖有一层介孔二氧化硅的柔性薄膜（P(VDF-HFP)@SiO），然后将其用作支架来吸收有机电解质，制成用于LIBs的凝胶电解质膜（P(VDF-HFP)@SiO-GE）。P(VDF-HFP)@SiO-GE具有高电解质吸收率（约1000 wt%）、热稳定性（高达约350°C）、离子电导率（室温下约2.6 mS cm）以及与活性锂金属阳极优异的兼容性。同时，通过在氩气气氛下碳化P(VDF-HFP)@SiO薄膜还制备了氟掺杂碳/二氧化硅复合纳米纤维（F-C@SiO）并用于制作电极。组装的F-C@SiO|P(VDF-HFP)@SiO-GE|Li半电池在0.2 A g的电流密度下经过300次循环后显示出长循环稳定性，并且比F-C@SiO|Celgard 2325|Li半电池（175 mAh g）具有更高的放电比容量（340 mAh g），这为设计和制造更安全的高性能LIBs指明了一条新途径。
