NOVELTY - A non-aqueous secondary battery has non-aqueous electrolyte which contains lithium salt, negative electrode which can occlude-discharge lithium and positive electrode accommodated in a battery container. Negative electrode is a carbonaceous compound consists of natural graphite or artificial graphite which can occlude-discharged lithium reversibly. The porosity of the mixture which comprises the positive electrode and negative electrode which contains oxide or chalcogenite of group 15 metal or semi-metal from transition metal and group 13 is 10-45%.    USE - Non-aqueous secondary battery for electronic device e.g. notebook personal computer, monochrome notebook personal computer, subnote PC pen input personal computer, pocket (palm top) personal computer, notebook-type word processor, pocket word processor, electronic book reader, mobile telephone, cordless phone mobile unit, pager, hand-held terminal, portable facsimile, portable copy, portable printer, headphones stereo, video movie, liquid crystal television, handy cleaner, portable CD, minidisc, electric shaver, electronic translating machine, vehicle telephone, transceiver, power tool, electronic notebook, calculator, memory card, tape recorder or radio, backup power supply, motor vehicle, electric vehicle, motor, lighting fixture, toy, game machine device, load conditioner, iron, timepiece, electronic flash, camera, medical devices e.g. pacemaker, hearing aid or shoulder massage machine, objects for munitions or object for space.    ADVANTAGE - The non-aqueous secondary battery may be used in heavy current and in a wider temperature range and charge-and-discharge characteristics e.g. discharge potential, discharge capacity and charging/discharging cycle life, productivity, and safety are improved.    DETAILED DESCRIPTION - A non-aqueous secondary battery has non-aqueous electrolyte which contains lithium salt, negative electrode which can occlude-discharge lithium and positive electrode accommodated in a battery container. Negative electrode is a carbonaceous compound consists of natural graphite or artificial graphite which can occlude-discharged lithium reversibly. The porosity of the mixture which comprises the positive electrode and negative electrode which contains oxide or chalcogenite of group 15 metal or semi-metal from transition metal and group 13 is 10-45%. The positive electrode and/or negative electrode have a protective layer which contains titanium oxide (TiO2) and binder. The solvent contains 15-90 vol.% dimethyl carbonate, ethylmethyl carbonate, methyl propionate and/or ethylpropionate esters as non-aqueous electrolyte and 10-55 vol.% ethylene carbonate. The nonaqueous electrolyte contains 0.6-1.5 M dissolved lithium hexafluorophosohate (LiPF6) and/or lithium tetrafluoroborate (LiBF4).