利用强、弱酸阳离子树脂掺杂改性聚偏氟乙烯(PVDF)膜(S-PVDF、W-PVDF),制备了具有阳离子交换特性的复合隔膜并对比其性能。红外光谱(FT-IR)分析表明:带有磺酸和羧酸基团的树脂掺杂在PVDF中。X射线衍射(XRD)分析表明:强、弱酸树脂的掺杂并未影响PVDF的自身结构。电化学阻抗(EIS)分析表明:隔膜的离子电导率显著提高。另外,离子交换容量、电解液吸收率、选择透过性也有所提高,表明该膜可有效阻挡氧化还原中间体透过,具有优良的离子选择性。其中强酸阳离子树脂改性膜性能更为突出。将S-PVDF、W-PVDF膜作为锂氧电池隔膜,与GF膜相比循环寿命由75圈上升到345圈、159圈,倍率性能和全放电容量也大幅增加。扫描电镜(SEM)、XRD及拉曼光谱分析发现,使用改性的PVDF单离子导体膜有助于放电产物的分解,防止锂腐蚀。
The PVDF membrane (S-PVDF,W-PVDF) modified by strong and weak acid cationic resin was used to prepare the composite diaphragm with cation exchange characteristics and compare its properties.FT-IR analysis showed that the resin with sulfonic and carboxylic acid groups were successfully doped in PVDF.The XRD analysis indicated that the doping of strong and weak acid resins did not affect the structure of PVDF itself.The EIS analysis revealed that the ionic conductivity of the membrane was significantly improved.In addition,the ion exchange capacity,electrolyte absorption rate and selective permeability were also enhanced,indicating that the membrane could effectively block the passage of REDOX intermediates and had excellent ion selectivity.The modified membrane performance of strong acid cationic resin was more prominent.Using S-PVDF and W-PVDF membranes as lithium oxygen battery diaphragm,the cycle life increased from 75 cycles to 345 cycles and 159 cycles compared with GF membrane,and the multiplier performance and full discharge capacity were also greatly increased.SEM,XRD and Raman analysis found that the use of modified PVDF single ion conductor membrane helped in the decomposition of discharge products and prevented lithium corrosion.
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基金资助
国家自然科学基金(51874051和52111530139)
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