Molybdenum disulfide intercalates with special transport properties

Chemical modification of molybdenum disulfide based either in the restackin g of the layered solid or the intercalation of lithium or organic donors as poly(ethylene oxide) or dialkylamines lends to products with improved tran sport properties. The products are mixed electronic-ionic conductors. Elect rical conductivity, which in pressure compacted samples shows a clear aniso tropic behavior, depends on the nature of the intercalated phase. For some dialkylamines sigma -values of about 10(-2) S cm(-1) are reached. Electrode potentials available from charge/discharge curves in lithium electrochemic al cells are mainly determined by both the trigonal prismatic-octahedral ph ase equilibrium in the matrix and the capacity of the guest for stabilizing Li+ ions in the interlaminar spaces. MoS2 phase change during lithium inte rcalation is also detected in the analysis of the Li-7-NMR linewidths of th e LixMoS2 intercalates. Lithium diffusion coefficient analysis indicates th at the mass transport of modified MoS2 is in general better than in the pri stine compound.