The electrical conductivity, the lithium diffusion, and the diffusion activation thermodynamics of the nanocomposites arising from the co-intercalation of lithium and poly(ethylene oxide) in molybdenum disulfide, Li0.1MoS2(PEO)(0.5) and Li0.1MoS2(PEO)(1.0), are analyzed and compared with those of pure MoS2. According to qualitative galvanostatic relaxation experiments, the products are mixed ionic and electronic conductors with a ratio sigma(e)/sigma(i) Of about 10(3).