Lithium diffusion in magnetic materials is found to be well detected by muon-spin spectroscopy. However, such a diffusive behavior has been measured without potential gradient, resulting in leading a self-diffusion coefficient. On the other hand, electrochemical measurements are always carried out under potential gradient and provide a chemical-diffusion coefficient. Although a chemical-diffusion coefficient is proportional to a self-diffusion coefficient, a proportional factor, i.e. a thermodynamic factor is not clearly determined by conventional measurements. Thanks to the time structure of the pulsed muon-beam, we could apply pulsed electric field to the sample just before muons come. This means that a chemical-diffusion coefficient would be estimated by muSR measurements under pulsed electric field. We thus wish to propose the experiment on battery materials under electric field.