PVDF为成膜材料制备锂离子筛膜的性能研究

Preparation and adsorption properties of lithium-ion sieve membrane

将锂锰氧化物(Li1.6Mn1.6O4)添加到聚偏氟乙烯(PVDF)铸膜液中,通过相转化法制备了掺杂Li1.6Mn1.6O4的锂离子筛前驱体膜,经过盐酸处理洗脱锂离子后制得锂离子筛膜。采用X射线衍射、扫描电镜、吸附实验等手段对膜的结构和吸附性能进行表征。吸附实验表明,随着Li1.6Mn1.6O4含量的增加,锂离子筛膜的吸附量先增加后减小。当添加Li1.6Mn1.6O4的质量分数为15%时,锂离子筛膜的吸附量最高为6.98×102 mg/cm2。

A series of lithium-ion sieve precursor membrane with different amounts of spinel-type manganese ox- ide （Li1.6Mn1.6O4） were prepared by the phase-inversion process. The membrane was treated with HC1 solution to extract lithium, resulting in the lithium-ion sieve membrane. The structure and properties of the prepared lithium-ion sieve precursor membranes were characterized by means of SEM, XRD and adsorption experiments. Adsorption experiments show that adsorption capacity of membrane-type adsorbents increase with the amount of Li1.6Mn1.6O4 from 5% up to 15%. Further increasing the amount of Li1.6Mn1.6O4, the adsorption capacity of membrane-type adsorbents decreases. It indicates that the optimal content of Li1.6Mn1.6O4 embedded into the PVDF polymer matrix is 15% with the maximums adsorption capacity of 6.98× 10^2mg/cm2.