墨水涂覆法制备硫化物全固态锂离子电池

发布时间：2018-03-03 14:14

  本文选题：LiPS　切入点：硫化物固体电解质　出处：《中南大学学报(自然科学版)》2016年02期 　论文类型：期刊论文

【摘要】：采用墨水涂覆技术制备基于硫化物的电解质薄膜及其全固态锂离子电池。通过N-甲基吡咯烷酮(NMP)溶剂对真空烧结法制得的Li_8P_2S_9粉末进行处理,获得均匀、稳定的湛蓝色Li_8P_2S_9墨水。研究结果表明:NMP溶剂处理后的Li_8P_2S_9颗粒粒径从10μm降低到1μm左右,物相晶体结构不变,但改善颗粒间的接触性能。在Li_8P_2S_9墨水中添加一定量的聚偏二氟乙烯(PVDF)黏结剂,溶解完全后将墨水滴涂在磷酸铁锂正极表面,除去溶剂即可一步实现电解质的成膜及电解质与正极的复合。当PVDF与Li_8P_2S_9的质量比为1:10时,电解质膜30℃下的锂离子电导率为2.03×10~(-4)S/cm,25℃电化学窗口为5.15V。以该墨水涂覆法制得的LiFePO_4/Li电池可在室温下稳定工作,0.2C下循环100圈的平均比容量为113.7mA·h/g,库仑效率为99%。
[Abstract]:The sulfide-based electrolyte film and its all-solid lithium ion battery were prepared by ink coating technique. The Li_8P_2S_9 powder prepared by vacuum sintering was treated with N-methylpyrrolidone (NMP) solvent, and the results were uniform. Stable blue Li_8P_2S_9 ink. The results show that the particle size of Li_8P_2S_9 is reduced from 10 渭 m to about 1 渭 m, and the crystal structure of the phase is unchanged. However, the contact properties between particles were improved. Adding a certain amount of PVDF binder to Li_8P_2S_9 ink, the ink droplets were coated on the surface of lithium iron phosphate positive electrode after dissolved completely. When the mass ratio of PVDF to Li_8P_2S_9 is 1:10, the film formation of electrolyte and the recombination of electrolyte and positive electrode can be realized in one step by removing the solvent. The lithium ion conductivity of the electrolyte membrane at 30 鈩，

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