吡啶络合法制备六氟磷酸锂  

Preparation of lithium hexafluorophosphate by pyridinium complexometry

作　　者：田明明[1] 刘晓红[1] 

机构地区：[1]南昌大学环境与化学工程学院,江西南昌330031

出　　处：《无机盐工业》2014年第6期75-78,共4页Inorganic Chemicals Industry

摘　　要：以吡啶络合法制备锂电池的电解质六氟磷酸锂。先用吡啶和六氟磷酸反应制得六氟磷酸吡啶,然后通过锂交换反应得到六氟磷酸吡啶锂,再以四氢呋喃为溶剂、浓硫酸为沉淀剂制得六氟磷酸锂产品。中间产品六氟磷酸吡啶以及最终产品六氟磷酸锂经红外光谱表征证实是目的产物。吡啶和六氟磷酸反应制备六氟磷酸吡啶适宜工艺条件:原料配比即六氟磷酸与吡啶物质的量比为0.8,反应温度为常温,反应时间为2 h。该方法与传统工艺相比,吡啶和六氟磷酸原料无腐蚀性,对设备要求低;选用水作为溶剂,廉价易得;所得产物稳定,产物中的杂质容易去除。The lithium ion battery electrolyte,lithium hexafluorophosphate was prepared by using pyridine complexometry. The first step was to prepare intermediate product pyridinium hexafluorophosphate by reacting pyridine with phosphorofluoric acid. The other intermediate product LiCsHsNHPF6 was prepared by performing the Li-ion exchange reaction.The final step was to prepare the target product LiPF6 with a high purity by using tetrahydrofuran as solvent and concentrated sulfuric acid as precipitant.The IR spectra of lithium hexafluorophate and pyridinium hexafluorophosphate showed less artifactual bands. Single factor experiment has determined the suitable process conditions ： the amount-of-substance ratio of hexafluorophospho- ric acid to pyridine was 0.8, reaction temperature was room temperature, and reaction time was 2 h.Compared with traditional technology,pyridine and hexafluorophosphoric acid were non-corrosive, so the equipment could work under lower require- ments; distilled water was chosen as the solvent for it was easy and cheap to prepare ; the product was stable, and impurity can be removed easily.

关 键 词：吡啶 六氟磷酸吡啶 六氟磷酸锂 制备 

分 类 号：TQ131.11[化学工程—无机化工]