A novel inorganic-organic polymer electrolyte with a high conductivity: insertion of poly(ethylene) oxide into LiV3O8 in one step

作者：Yang G; Hou WH^*; Sun ZZ; Yan QJ

来源：Journal of Materials Chemistry, 2005, 15(13): 1369-1374.

DOI：10.1039/b415041d

A novel nanocomposite, PEO-LiV3O8, was synthesized by the intercalation of poly( ethylene) oxide (PEO) into the interlayers of LiV3O8 in one step. It was found that the two different components were combined on the nano-scale; the insertion of polymer was topotactic and did not cause structural changes in the layered host. The single-step weight loss (11.8 wt%) with TG/DSC measurement and other characterization results from XRD, FTIR, Raman, SEM, and TEM revealed that the putative molecular structure of PEO within the layers was similar to the zig-zag Type-1 conformation of PEO-HgCl2. The inserted PEO chains decreased the interaction of the negative V3O8- layers with Li+ ions. Because a few interlayered PEO chains extended from the lamellae and connected further with each other, the adjacent PEO-LiV3O8 crystals were aggregated, thus providing a novel and suitable two-dimensional channel for Li+ ions to quickly transfer between the nancomposite grains. This particular hybrid structure of PEO-LiV3O8 resulted in an improvement of the electrochemical properties. The room temperature conductivity of PEO-LiV3O8 ( 2.99 x 10(-4) S cm(-1)) was superior to that of the conventional SPEs (LiClO4-PEO, 1.1 x 10(-7) S cm(-1)) and the host material LiV3O8 (8.68 x 10(-5) S cm(-1)). Similar observations were also noted in other experimental parameters, such as the activation energy, diffusion coefficient of Li+ ions, and conductivity calculated by fitting EIS data.

• 出版日期2005
• 单位南京大学