NOVELTY - The battery has an anode (22) including an anode current collector and an anode active material layer provided between the anode current collector and a separator (23) i.e. porous film. A cathode (21), the anode and the separator include thermally-conductive particles in a region between a cathode current collector and the anode current collector, where heat conductivity of the thermally-conductive particles is larger in first direction that intersects with second direction in which the cathode and the anode are opposed to each other than in the first direction.    USE - Cylindrical-type lithium ion secondary battery for use in a battery pack mounted on a portable electronic apparatus e.g. video camcorder, digital still camera, mobile phone, notebook personal computer, cordless phone, headphone stereo, portable radio, portable TV and personal digital assistant, a mobile lifestyle electric appliance e.g. electric shaver, memory device such as backup electric power source and memory card, an electric power tool e.g. electric drill and electric saw, a medical electronic apparatus e.g. pacemaker and hearing aid, an electric vehicle e.g. electric automobile such as hybrid automobile, and an electric power storage system i.e. home battery system. Can also be used as a square-type secondary battery, coin-type secondary battery and a button-type secondary battery.    ADVANTAGE - The separator includes a base material layer formed of a porous film and a polymer compound layer provided on a single surface of the base material layer, so that adhesibility of the separator with respect to the cathode and the anode can be improved, skewness of spirally wound electrode body can be suppressed, decomposition reaction of electrolytic solution can be suppressed, liquid leakage of the electrolytic solution with which the base material layer is impregnated, can be suppressed, resistance of the secondary battery can be increased even if charge and discharge are repeated, and battery swollenness is suppressed. The battery is designed such that the cathode, the anode and the separator include the thermally-conductive particles in a region between the cathode current collector and the anode current collector, so that superior safety can be obtained for the battery. The battery has superior battery characteristics, so that performance of the battery can be effectively improved.    DETAILED DESCRIPTION - The cathode active material layer includes a cathode active material selected from a group consisting of lithium, nickel, cobalt and manganese and oxygen as constituent elements. The anode active material layer includes anode active material selected from a group consisting of silicon and tin as constituent elements.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a cylindrical-type secondary battery.    Battery can (11)    Battery cover (14)    Safety valve mechanism (15)    Cathode (21)    Anode (22)    Separator (23)