One of the challenges for all solid lithium batteries is to keep low area specific resistance during cycling without external pressure. Many efforts have been paid. In this report, our strategy to develop high energy density lithium ion batteries and metallic lithium batteries with hybrid solid/liquid electrolyte or all solid electrolyte via in situsolidification is introduced. The problems of the hybrid system and possible solutions are discussed. By tuning the type of solvents, salts and additives, controlling the formation conditions, introducing prelithiation, coating inorganic solid electrolyte very thin layer on cathode, the cell can operate at wide temperature range with reasonable rate performance. Energy densities of the pouch cells are in the range of 210-500Wh/kg, mainly depending on the weight ratio of lithium in anode and the selection of the cathode. Some basic scientific problems in this design will be also addressed.