As the material does not have a constant potential at the beginning of the lithiation, the material was prelithiated chemically using n-butyllithium (1.6M from Merck Sigma). The amount of nbutyllithium needed to half lithiate the Li4Ti5O12 to ~Li5.5Ti5O12 (prelithiated LTO) was calculated and the reaction was carried out in hexane while stirring continuously inside an Ar-filled glovebox. After the reaction the hexane was evaporated. For the measurements, the prelithiated LTO, the Li3YBrxCl6-x solid electrolyte, Super C45 and carbon nanofibers were ball milled with the ratio of 0.45: 0.40: 0.10: 0.05 for 2 hours at 300 rpm. 25mg of that mixture was used as the electrode.