the present invention concerns a lithium electrochemical generator including at least one composite electrode comprising an active material and a first and second solid electrolytes non - homogeneously distributed into the composite . the first solid electrolyte is of mineral nature , vitreous or partly vitreous , and is a specific conductor of lithium ions , and is preferably localized on the surface of the particles of active materials of the electrode . the second solid electrolyte is organic , comprises a dry or gelified polymer electrolyte conducting ions surrounding the dispersed solid phases and acts as a deformable binder , preferably elastomeritically , of the composite in contact also with the collector and the separator electrolyte of the generator . a thin layer of the first electrolyte wets and coats at least a part of the surface of the active material particles to protect the coated surface of passivation or degradation reactions induced by the second electrolyte , and to maintain a good quality of ionic and electronic exchanges between the active material of the electrode and the other components of the composite , the first electrolyte being impermeable to the components of the second electrolyte .